Mfe 2A651 Vol 1-5 Unit Review 100 Random Questions

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1. To prepare the engine fuel system for service after depreservation, you must flush the system with

Explanation

To prepare the engine fuel system for service after depreservation, it is necessary to flush the system with fuel. This is because fuel is the appropriate substance to clean out any residual oil or contaminants that may have accumulated during the depreservation process. Flushing the system with fuel ensures that the engine fuel system is ready for operation and prevents any potential issues that could arise from using oil, PD-680, or calibration fluid.

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Mfe 2A651 Vol 1-5 Unit Review 100 Random Questions - Quiz

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2. When metal is attacked by chemical corrosion, it will start

Explanation

When metal is attacked by chemical corrosion, it typically starts on the surface of the metal. This is because the surface of the metal is exposed to the external environment, where it can come into contact with corrosive substances such as moisture, acids, or salts. These corrosive substances react with the metal at the surface, causing it to corrode. As the corrosion progresses, it may eventually penetrate deeper into the metal, but it typically begins on the surface.

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3. On the personnel maintenance platforms, the purpose of the platform safety lockpins is to

Explanation

The purpose of the platform safety lockpins is to prevent the platform from lowering while it is in use. This safety feature ensures that the platform remains at a stable height and does not accidentally lower, which could pose a risk to the personnel using it. By locking the platform in place, the lockpins provide an additional layer of security and prevent any unwanted movement while the platform is in use.

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4. The term "No. 320 grit" refers to which feature of sandpaper?

Explanation

The term "No. 320 grit" refers to the coarseness of the sandpaper. Grit is a measure of how rough or coarse the sandpaper is, with higher numbers indicating finer grits and lower numbers indicating coarser grits. In this case, "No. 320 grit" indicates that the sandpaper has a finer coarseness, making it suitable for smoother finishes or finer sanding tasks.

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5. Before inspecting new jet engine bearings, you should

Explanation

Before inspecting new jet engine bearings, it is necessary to remove the preservative coating. This is because the preservative coating is applied to protect the bearings during storage and transportation. Removing the coating allows for a thorough inspection of the bearings to check for any damage or defects. By removing the preservative coating, any potential issues with the bearings can be identified and addressed before they are installed in the jet engine.

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6. Aircraft power plant and engine intermediate maintenance technical orders (TO) contain information on troubleshooting. This information is presented in the form of

Explanation

Aircraft power plant and engine intermediate maintenance technical orders (TO) contain information on troubleshooting, which is presented in the form of troubleshooting charts. These charts provide a systematic approach to identify and resolve issues that may arise during the maintenance or operation of the power plant and engine. They typically outline a series of steps or questions to help technicians diagnose and troubleshoot problems effectively. By referring to these troubleshooting charts, maintenance personnel can quickly and accurately identify the root cause of an issue and take appropriate corrective actions.

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7. To become an expert troubleshooter, you must

Explanation

To become an expert troubleshooter, it is crucial to understand the function of each unit within each system. This knowledge allows troubleshooters to identify and resolve issues effectively. While being a 7-level, having at least 5 years of experience, and attending college courses in troubleshooting techniques may contribute to expertise, understanding the function of each unit within each system is the most essential requirement. This understanding enables troubleshooters to analyze problems comprehensively and apply appropriate solutions, ensuring efficient troubleshooting and problem-solving.

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8. Most engine monitoring gauges and instruments require some type of

Explanation

Most engine monitoring gauges and instruments require a transmitter and indicator. This is because the transmitter is responsible for converting the physical measurements, such as temperature or pressure, into electrical signals. These electrical signals are then sent to the indicator, which displays the readings in a format that can be easily interpreted by the user. Without both the transmitter and indicator, the engine monitoring system would not be able to accurately measure and display the necessary information.

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9. What directs the gases onto the first-stage turbine wheel blades in a jet engine?

Explanation

The turbine stator directs the gases onto the first-stage turbine wheel blades in a jet engine. The stator is a stationary component of the turbine and its primary function is to guide and redirect the flow of gases from the combustion chamber towards the turbine blades. It helps to optimize the efficiency and performance of the turbine by ensuring that the gases are directed onto the blades at the correct angle and velocity, allowing for effective energy transfer and power generation.

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10. Which engine component meters fuel for combustion?

Explanation

The fuel control is responsible for metering the fuel for combustion in the engine. It regulates the flow of fuel based on the engine's needs, ensuring the correct amount of fuel is delivered to the combustion chamber. The P&D valve is not directly involved in metering fuel, but rather regulates the pressure and flow of fuel. The fuel pump is responsible for delivering fuel from the tank to the engine, but it does not meter the fuel. The fuel nozzles are responsible for injecting fuel into the combustion chamber, but they do not control the amount of fuel being delivered.

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11. The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow

Explanation

The engine fuel-flow indicating system of most jet powered aircraft consists of a fuel-flow transmitter and a fuel-flow indicator. The transmitter measures the rate at which fuel is flowing to the engine and sends this information to the indicator, which displays it to the pilot. This allows the pilot to monitor the fuel consumption of the engine and make adjustments as necessary.

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12. To measure barometric pressure, you would use a

Explanation

A barometer is used to measure barometric pressure, which is the pressure exerted by the atmosphere. A potentiometer is an electrical device used to measure voltage or resistance, not pressure. A psychrometer is used to measure relative humidity. A pyrometer is used to measure high temperatures. Therefore, the correct answer is barometer.

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13. Two units that work together to indicate that the oil system is operating correctly are the oil pressure

Explanation

The oil pressure transmitter and indicator are two units that work together to indicate the correct operation of the oil system. The transmitter measures the oil pressure and sends the signal to the indicator, which displays the pressure reading to the operator. This allows the operator to monitor the oil system and ensure that it is functioning properly.

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14. Which section of a jet engine keeps the compressor rotating?

Explanation

The turbine section of a jet engine keeps the compressor rotating. As the hot gases from the combustion chamber pass through the turbine, they cause the turbine blades to spin. This rotational energy is then transferred to the compressor, which is connected to the turbine, keeping it rotating and allowing it to continue compressing air for the combustion process.

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15. Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?

Explanation

A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of generating an electric charge when subjected to mechanical stress or vibration. This charge is then converted into an electrical signal that can be measured and analyzed. Therefore, a piezoelectric accelerometer is the correct answer as it utilizes these materials to detect and measure vibrations.

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16. Which squadrons form a maintenance group?

Explanation

The correct answer is Maintenance operations, maintenance, aircraft maintenance, and quality assurance. This answer includes all the necessary components that form a maintenance group. Maintenance operations, maintenance, and aircraft maintenance are all directly related to the maintenance of the aircraft, while quality assurance ensures that the maintenance is carried out correctly and meets the required standards.

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17. When you are assigned to an aircraft maintenance squadron as an engine troop, to what flight will you most likely be assigned?

Explanation

As an engine troop in an aircraft maintenance squadron, you will most likely be assigned to the specialist flight. This is because as an engine troop, your primary responsibility would be to specialize in the maintenance and repair of aircraft engines. Being assigned to the specialist flight would allow you to focus on your specific area of expertise and contribute to the overall maintenance and operational readiness of the squadron's aircraft.

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18. In addition to the visual inspection the T–56 engine fuel nozzle also requires what type of inspection?

Explanation

The T-56 engine fuel nozzle requires a spray pattern inspection in addition to visual inspection. This means that apart from visually inspecting the nozzle, it is also necessary to check the pattern in which the fuel is being sprayed. This ensures that the fuel is being distributed evenly and properly, which is crucial for the engine's performance and efficiency.

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19. Toxic materials are easiest to get into the body and cause rapid toxic reactions when they

Explanation

Toxic materials in the form of gases are the easiest to get into the body because they can be inhaled directly into the respiratory system. Gases can easily penetrate through the lungs and enter the bloodstream, allowing them to quickly reach various organs and cause toxic reactions. In contrast, aerosols, liquids, and solids may require additional pathways such as ingestion or absorption through the skin, which can be slower and less efficient in delivering toxic substances to the body.

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20. When an engine arrives for a test run at the test cell, it must

Explanation

The correct answer is "be operable with all known discrepancies corrected." This means that when an engine arrives for a test run at the test cell, it should be in a condition where all known issues or problems have been fixed. This ensures that the engine is ready and able to be tested without any major issues or malfunctions.

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21. Who is responsible for providing you with training on how to wear, use, and maintain personal protective equipment?

Explanation

The supervisor is responsible for providing training on how to wear, use, and maintain personal protective equipment. They are in charge of ensuring that employees understand and follow safety protocols to protect themselves in the workplace. Safety, environmental, and your mom are not responsible for providing this training.

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22. From what perspective does the RSS manage supply?

Explanation

The RSS manages supply from the perspective of the weapons system. This suggests that the RSS is responsible for ensuring the availability and maintenance of weapons and related equipment. This perspective implies a focus on managing the inventory, distribution, and maintenance of weapons to support operational readiness and effectiveness.

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23. Responsibility for the proper preventive maintenance of a test cell facility rests with the

Explanation

The correct answer is "individuals assigned." This means that the responsibility for the proper preventive maintenance of a test cell facility lies with the individuals who have been assigned to it. It is their duty to ensure that the necessary maintenance tasks are carried out to keep the facility in good working condition and prevent any potential issues or breakdowns. This answer implies that the responsibility is not solely on a specific squadron or flight, but rather on the individuals who have been given the task of maintaining the test cell facility.

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24. Using the wrong cleaning agent on a jet engine part

Explanation

Using the wrong cleaning agent on a jet engine part could destroy it. Different cleaning agents have specific properties and are designed for specific materials and surfaces. Using the wrong cleaning agent can cause corrosion, erosion, or damage to the part's surface, leading to potential failure or malfunction of the jet engine. It is crucial to use the correct cleaning agent to ensure the longevity and proper functioning of the engine part.

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25. Which item is one that a storage time period must be assigned to ensure that it will perform satisfactorily over a specified period of time?

Explanation

Shelf-life is the correct answer because it refers to the length of time a product can be stored before it becomes unfit for use or consumption. Assigning a storage time period to an item ensures that it will be used or consumed within its specified shelf-life, thus guaranteeing satisfactory performance over that period. This is particularly important for perishable goods or items that may degrade or deteriorate over time.

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26. Which inspection is conducted by maintenance personnel after an occurrence of a specific or unusual condition?

Explanation

After an occurrence of a specific or unusual condition, maintenance personnel conduct a special inspection. This type of inspection is carried out to assess and address the specific or unusual condition that has occurred. It is different from regular inspections and is conducted to ensure that any necessary repairs or maintenance tasks are performed to address the specific condition and prevent any further issues.

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27. Which type of technical manual is divided into tasks that cover a particular maintenance action?

Explanation

A job guide is a type of technical manual that is divided into tasks that cover a particular maintenance action. It provides step-by-step instructions and guidance for carrying out specific maintenance tasks. This type of manual is useful for technicians who need to perform maintenance actions on equipment or systems. It helps them understand the sequence of tasks involved in a particular maintenance action and ensures that they follow the correct procedures.

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28. The key to making the CEMS work is

Explanation

The CEMS (Continuous Emissions Monitoring System) is dependent on accurate and timely data at the lowest level. This means that the system relies on collecting information from individual sources or components within the system, such as engines and their parts. This data is crucial for monitoring and analyzing emissions and ensuring compliance with environmental regulations. Without accurate and timely data at the lowest level, the CEMS would not be able to effectively monitor and manage emissions.

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29. Once the cooling airflow has done its job of cooling the turbine section, where does it go?

Explanation

The cooling airflow goes into the gas stream to exit the engine. This is because once the cooling airflow has cooled the turbine section, it is no longer needed and is expelled from the engine along with the exhaust gases.

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30. What should you use for cleaning measuring tools?

Explanation

Dry-cleaning solvent is the correct answer because it is specifically designed for cleaning delicate fabrics and materials without causing damage. Measuring tools are often made of sensitive materials such as stainless steel or plastic, and using harsh chemicals like Turbo-super-carb or Trychlorethlene could potentially corrode or degrade the tools. WD-40, on the other hand, is a lubricant and not suitable for cleaning measuring tools. Therefore, dry-cleaning solvent is the most appropriate option for effectively and safely cleaning measuring tools.

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31. When operating a borescope, what part of the borescope illuminates the interior of the area you are inspecting?

Explanation

The distal tip light guides illuminate the interior of the area being inspected when operating a borescope. These light guides are located at the distal end of the borescope and are responsible for providing the necessary light to visualize the inspection area.

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32. What is the term for the process of producing voltage in a conductor when it passes through a magnetic field?

Explanation

The term for the process of producing voltage in a conductor when it passes through a magnetic field is electromagnetic induction. This process occurs when there is a change in the magnetic field strength or when the conductor moves relative to the magnetic field. This phenomenon is the basis for the operation of generators and transformers.

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33. When a CIRF ships a replacement asset to a deployed unit, who is responsible for ensuring all appropriate documentation is completed?

Explanation

CIRF personnel are responsible for ensuring all appropriate documentation is completed when a replacement asset is shipped to a deployed unit. This includes verifying that all necessary paperwork, such as shipping documents and inventory records, are completed accurately and in a timely manner. It is their duty to ensure that the replacement asset is properly accounted for and that all necessary information is provided to the deployed unit for their records and operational requirements.

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34. You should record the removal and replacement of engine accessories on which one of the following AFTO Forms?

Explanation

The correct answer is 95. The AFTO Form 95 is used to record the removal and replacement of engine accessories. This form is specifically designed for documenting maintenance actions related to engine accessories, making it the appropriate choice for this task.

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35. Prior to removing a shipping container lid, what warning must be observed?

Explanation

Before removing a shipping container lid, it is important to release all pressure. This is necessary to ensure the safety of the person opening the container and to prevent any potential accidents or injuries. By releasing the pressure, any built-up gases or pressure inside the container can be safely released, reducing the risk of sudden release or explosion when the lid is opened. This precaution is crucial in maintaining a safe working environment and preventing any potential hazards.

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36. Engines inactive for over 180 days must have what accomplished?

Explanation

Engines that have been inactive for over 180 days must have a preservation run and fuel system preservation accomplished. This is necessary to ensure that the engine remains in good condition and is ready for use after a long period of inactivity. The preservation run helps to circulate the oil and prevent any build-up or damage to the engine. The fuel system preservation ensures that the fuel remains stable and does not degrade over time, which could cause issues when the engine is started again.

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37. When attempting to unfeather the 54H60–91 propeller in flight, where must the throttle be positioned?

Explanation

When attempting to unfeather the 54H60-91 propeller in flight, the throttle must be positioned above FLT IDLE. This means that the throttle can be in any position as long as it is higher than the FLT IDLE setting.

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38. What is the most common type of fuel nozzle system?

Explanation

The most common type of fuel nozzle system is the pressure-atomizing system. This system uses a combination of high pressure and a small orifice to atomize the fuel into a fine mist. This mist then mixes with air to create a combustible mixture for combustion. Pressure-atomizing systems are widely used in various applications, including in gas turbines, industrial burners, and oil-fired boilers. They are preferred for their efficient fuel atomization, which leads to better combustion and reduced emissions.

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39. What is the total gear reduction ratio of the RGB?

Explanation

The total gear reduction ratio of the RGB is 13.54:1. This means that for every 13.54 rotations of the input gear, the output gear will rotate once. This indicates that the RGB provides a significant reduction in speed and an increase in torque, making it suitable for applications that require high torque output.

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40. How many different types of loads can be imposed on a jet engine bearing?

Explanation

There are three different types of loads that can be imposed on a jet engine bearing.

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41. The bearing removal tools that are most commonly used include

Explanation

Arbor presses and bearing pullers are the most commonly used tools for bearing removal. Arbor presses are used to apply pressure and force to remove the bearing from its housing, while bearing pullers are designed specifically to grip and extract bearings. These tools provide efficient and effective methods for safely removing bearings without causing damage to the surrounding components.

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42. Fuel that accumulates after a failed start is

Explanation

After a failed start, the fuel that accumulates is not suitable for use in the engine. Therefore, it needs to be removed from the system. The most efficient way to do this is by draining the fuel overboard using a drain system. This ensures that the contaminated fuel is safely discarded and does not affect the performance or reliability of the engine.

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43. All of the options listed below are proper troubleshooting practices except

Explanation

The correct answer is inspecting other areas after isolating the trouble between points. This is because once the trouble has been isolated to specific points, it is more efficient to focus on those areas rather than inspecting other areas that may not be related to the issue. This helps to save time and resources in the troubleshooting process.

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44. Stationary vanes positioned between rotor discs in a compressor are used to

Explanation

The stationary vanes positioned between rotor discs in a compressor are used to direct air and increase pressure. These vanes help to guide the air flow and redirect it towards the rotor discs, which then further compress the air. By directing the air and increasing the pressure, the vanes play a crucial role in the overall efficiency and performance of the compressor.

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45. The tendency of an object at rest to remain at rest and the tendency of an object in motion to continue its motion in a straight line at the same speed is called

Explanation

Inertia is the correct answer because it refers to the tendency of an object at rest to stay at rest and an object in motion to keep moving in a straight line at a constant speed. It is a property of matter that resists changes in motion and is related to the mass of the object. Energy, friction, and potential are not accurate descriptions of this concept.

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46. Which section of a jet engine introduces and burns fuel?

Explanation

The section of a jet engine that introduces and burns fuel is the combustion section. This is where the fuel is mixed with compressed air and ignited, creating a high-temperature gas that expands and provides the necessary thrust to propel the aircraft forward. The combustion section is a critical component of the jet engine as it converts the chemical energy in the fuel into thermal energy and ultimately into kinetic energy.

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47. The main fuel control allows the engine to safely accelerate, reducing the possibility of

Explanation

The main fuel control in an engine is responsible for regulating the amount of fuel being supplied to the combustion chambers. By controlling the fuel flow, it ensures that the engine operates within safe limits during acceleration. Flameout refers to the sudden extinguishing of the flame in the combustion chamber, which can occur due to various reasons such as fuel starvation or excessive turbulence. Therefore, the main fuel control plays a crucial role in preventing flameout by maintaining a consistent and appropriate fuel supply to the engine.

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48. What is the main function of the MOC?

Explanation

The main function of the MOC is to monitor and coordinate sortie production, maintenance production, and execution of the flying and maintenance schedules, and maintain visibility of fleet health indicators. This means that the MOC is responsible for overseeing and managing the production and execution of flight and maintenance operations, ensuring that schedules are followed and fleet health is maintained.

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49. What type of training is provided to help you learn the knowledge portion of your job?

Explanation

A career development course is provided to help individuals learn the knowledge portion of their job. This type of training focuses on enhancing skills, knowledge, and abilities related to the specific career or job role. It provides employees with the necessary tools and resources to develop their careers and improve their performance in their current roles. This type of training often includes workshops, seminars, online courses, and other learning opportunities that are designed to enhance job-related knowledge and skills.

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50. You may attend the ALS after having how many months in the Air Force?

Explanation

In the Air Force, you are eligible to attend the Airman Leadership School (ALS) after completing 48 months of service. ALS is a professional military education program that enhances leadership skills and prepares airmen for supervisory roles. By completing 48 months, airmen have gained enough experience and knowledge to benefit from the training provided in ALS.

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51. FOD is normally caused by

Explanation

FOD, or Foreign Object Debris, is typically caused by people. This refers to any object, substance, or debris that is not part of an aircraft or its components, but can cause damage or pose a safety risk. Common examples include tools, loose hardware, or even trash left on runways or in maintenance areas. While animals, weather, and mechanical failure can also contribute to FOD incidents, the primary cause is human error, such as improper maintenance practices, failure to secure equipment, or negligence in cleaning up after work.

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52. What term is used to indicate that air is being mixed with the oil in the oil pump to create pockets of air?

Explanation

Aeration is the term used to indicate that air is being mixed with the oil in the oil pump to create pockets of air. This process can lead to decreased lubrication and potential damage to the engine.

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53. You can get information such as temperature and barometric pressure from equipment at the test cell site or from

Explanation

The control tower is the correct answer because it is responsible for monitoring and controlling the airspace and operations at the test cell site. They have access to real-time information such as temperature and barometric pressure, which are crucial for safe aircraft operations. The control tower communicates this information to pilots and other personnel involved in the testing process.

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54. What are microscopic metallic particles in the oil system called?

Explanation

Microscopic metallic particles in the oil system are called wear metals. These particles are formed due to the natural wear and tear of metal components in the system. As the components rub against each other, tiny metal particles are released into the oil, which can cause further damage and degradation if not properly managed. Monitoring the levels of wear metals in the oil system is important for assessing the health and performance of the system.

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55. What supports base-level technicians by providing technical assistance and performing any repairs beyond their responsibility/capability?

Explanation

Depot maintenance supports base-level technicians by providing technical assistance and performing any repairs beyond their responsibility/capability. Depot maintenance refers to the level of maintenance performed at a central facility or depot, where highly skilled technicians and specialized equipment are available to handle complex repairs and maintenance tasks. This level of maintenance is necessary when base-level technicians are unable to handle the repairs or when the repairs require specialized knowledge and resources.

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56. What would you use to hold your tools when you cannot locate your toolbox within arm's reach?

Explanation

When you cannot find your toolbox within arm's reach, the most logical solution would be to use a toolbag. A toolbag is specifically designed to hold and organize tools, making it the ideal option for storing and carrying tools when your toolbox is not readily available. A ziplock bag, parts bag, and FOD bag may not be suitable alternatives as they are not specifically designed for holding tools and may not provide the necessary organization and protection for your tools.

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57. Light is transmitted to the tip of a borescope by

Explanation

The correct answer is the fiber optics. Fiber optics is a technology that uses thin, flexible strands of glass or plastic to transmit light signals. In the case of a borescope, the light is transmitted to the tip of the device through these fiber optic strands, allowing for illumination of the area being inspected. This method is preferred for its flexibility, durability, and ability to transmit light over long distances without significant loss of intensity.

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58. On the 54H60–91 propeller, during normal propeller operation, the output of which pumps is used?

Explanation

During normal propeller operation on the 54H60-91 propeller, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for maintaining the necessary pressure and scavenging functions in the propeller system. The main pressure pump ensures that there is sufficient oil pressure for proper propeller operation, while the main scavenge pump removes any excess oil and debris from the propeller system. Therefore, the correct answer is main pressure and main scavenge.

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59. The oil pressure indicator receives an electrical signal from the

Explanation

The oil pressure indicator receives an electrical signal from the transmitter. This suggests that the transmitter is responsible for sending the necessary information about the oil pressure to the indicator. The other options, such as the gyro, hydraulic unit, and synchronous unit, do not seem to be directly related to the transmission of electrical signals for oil pressure indication.

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60. Which program's purpose is to ensure safe and healthy working conditions for all Air Force employees?

Explanation

AFOSH stands for Air Force Occupational Safety and Health. It is a program that focuses on ensuring safe and healthy working conditions for all Air Force employees. This program aims to prevent accidents, injuries, and illnesses in the workplace by implementing safety regulations, conducting inspections, and providing training and education on occupational safety and health. AFOSH plays a crucial role in maintaining the well-being of Air Force personnel and creating a safe working environment for them.

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61. When making general entries on the test cell engine log sheet, what should you do with the engine model and serial number?

Explanation

When making general entries on the test cell engine log sheet, it is important to verify the engine model and serial number on the engine data plate. This ensures that the correct information is recorded and avoids any potential errors or discrepancies. Checking past records, typing these items, or entering them only after the test is complete may not guarantee the accuracy of the information. Therefore, the best practice is to verify the numbers on the engine data plate.

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62. Base Supply must deliver numerous parts to numerous organizations on a prioritized basis because of what difference in each organization?

Explanation

The reason Base Supply must deliver numerous parts to numerous organizations on a prioritized basis is because each organization has a different mission. Different organizations have different objectives and goals, and therefore require different parts and supplies to fulfill their specific missions. By prioritizing deliveries based on the mission of each organization, Base Supply ensures that the right parts are delivered to the right organizations at the right time, allowing them to carry out their missions effectively.

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63. The longest calibrated movement between the spindle and anvil of an outside micrometer is

Explanation

The longest calibrated movement between the spindle and anvil of an outside micrometer is 1 inch. This means that the micrometer can accurately measure dimensions up to 1 inch in length. It is important to have a micrometer with a long enough calibrated movement to ensure accurate measurements for larger objects.

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64. When lockwiring, how many twists per inch are required to produce the proper stiffness?

Explanation

The proper stiffness when lockwiring requires 8 to 10 twists per inch.

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65. How many pins secure the adapters to the shipping container support?

Explanation

The correct answer is 4. This means that there are 4 pins that secure the adapters to the shipping container support.

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66. The recommended method of heating inner races of bearings before installing them is

Explanation

The recommended method of heating inner races of bearings before installing them is a hot-oil bath. This method involves immersing the bearings in hot oil to heat them uniformly and expand the inner races. This allows for easier installation onto the shaft or housing. The hot-oil bath method ensures that the bearings are heated evenly and reduces the risk of overheating or damaging the bearings. It is a commonly used technique in industries where precise bearing installation is required.

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67. Which component reduces the engine rotor speed to the rpm required for accessories?

Explanation

The reduction geartrain is responsible for reducing the engine rotor speed to the rpm required for accessories. This component is designed to decrease the rotational speed of the engine in order to provide the appropriate speed and torque for the accessories to operate efficiently. It serves as a mechanical transmission system that allows the engine to power various components such as the alternator, power steering pump, and air conditioning compressor at the correct speed.

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68. The pneumatic air bled from the small gas turbine engine cannot be used to

Explanation

The pneumatic air bled from the small gas turbine engine cannot be used to inflate aircraft tires because the air bled from the engine may not have the necessary pressure or volume required to inflate the tires. Additionally, the air bled from the engine may contain contaminants or impurities that could potentially damage the tires. Therefore, it is not suitable for inflating aircraft tires.

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69. Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?

Explanation

When small particles of foreign material become lodged between the rollers of a bearing, it can result in the formation of grooves on the surface. These grooves can cause uneven wear and damage to the bearing, leading to reduced performance and potential failure over time.

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70. If an engine stalls or surges during a test cell run, you should investigate the

Explanation

If an engine stalls or surges during a test cell run, the most likely component to investigate is the variable stator vanes. Variable stator vanes are responsible for controlling the airflow and pressure within the engine, and any malfunction or issue with them can cause the engine to stall or surge. Therefore, it is important to inspect and troubleshoot the variable stator vanes if such a problem occurs during a test cell run.

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71. When two or more turbine wheels are used in a jet engine, which component is placed directly in front of each turbine wheel?

Explanation

The correct answer is turbine stator (nozzle diaphragm). In a jet engine, the turbine stator is placed directly in front of each turbine wheel. The turbine stator is responsible for directing and controlling the flow of exhaust gases onto the turbine wheel, which in turn powers the compressor and drives the engine. It acts as a stationary nozzle that helps optimize the efficiency and performance of the turbine wheel.

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72. The two primary units of the tachometer indicating system are the tachometer generator and tachometer

Explanation

The tachometer indicating system consists of two primary units: the tachometer generator and the tachometer indicator. The tachometer generator is responsible for generating the electrical signals based on the rotational speed of the engine, while the tachometer indicator is the device that displays the actual readings or indications of the engine speed. Therefore, the correct answer is "indicator."

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73. Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?

Explanation

A divergent duct is designed to gradually increase in size, causing the gas to expand. As the gas expands, its velocity decreases and the pressure increases. This is because the increase in cross-sectional area allows for a larger volume of gas to occupy the space, resulting in a decrease in velocity and an increase in pressure. Therefore, a divergent duct would decrease the velocity and increase the pressure of a gas as it passes through.

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74. Which F100-PW–220 engine fuel system component controls pressurization of the core engine fuel system?

Explanation

The P&D valve is the fuel system component that controls pressurization of the core engine fuel system. It regulates the fuel flow and pressure to ensure proper combustion and performance of the engine. The N2 sensor measures the rotational speed of the engine's high-pressure compressor, the fuel nozzle is responsible for atomizing and injecting fuel into the combustion chamber, and the Fan inlet Tt2.5 sensor measures the temperature of the air entering the engine.

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75. During flightline and test cell operations, you may be exposed to

Explanation

During flightline and test cell operations, exposure to various chemicals and gases is possible. Acetone and toluene are commonly used solvents and may be present in these environments. Carbon dioxide is a natural component of the atmosphere and is not typically harmful in normal concentrations. However, carbon monoxide is a toxic gas that can be produced by the combustion of fuels and is a significant concern in aviation settings. Therefore, the correct answer is carbon monoxide.

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76. Which of these is not considered a cause of foreign object damage (FOD)?

Explanation

Foreign object damage (FOD) refers to any damage caused to an aircraft or engine due to the presence of foreign objects. The formation of ice, ingestion of rocks, and ingestion of bolts are all considered causes of FOD because they can potentially damage the aircraft or engine. However, the failure of internal parts is not considered a cause of FOD because it is not related to the presence of foreign objects. Instead, it is a mechanical or structural failure within the aircraft or engine itself.

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77. A common method for disposing of hazardous wasted is

Explanation

Dilution is a common method for disposing of hazardous waste because it involves mixing the waste with a large amount of water or another liquid to reduce its concentration. This process helps to lower the toxicity of the waste and make it safer for disposal. Dilution is often used for liquid or water-soluble waste that can be effectively diluted without causing harm to the environment. However, it is important to note that dilution is not always the most suitable method for all types of hazardous waste and other disposal methods may be required depending on the specific nature of the waste.

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78. Depot maintenance support base-level technicians by

Explanation

Depot maintenance support base-level technicians by providing technical assistance and performing repairs beyond their capability. This means that the depot maintenance support personnel are available to help the base-level technicians with any technical issues or repairs that they are unable to handle on their own. This support ensures that the technicians have the necessary expertise and resources to effectively maintain and repair equipment.

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79. Carrying a hand tool in your pocket is potentially hazardous because it could cause

Explanation

Carrying a hand tool in your pocket can be potentially hazardous because it may cause injury to the person carrying it. This is because the tool can accidentally poke or cut the person, especially if it is sharp or has protruding parts. It is important to store hand tools properly in a tool belt or toolbox to prevent any accidents or injuries.

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80. If you must torque a sequence of three or more bolts,

Explanation

Using a staggered sequence when torquing a sequence of three or more bolts helps ensure even distribution of torque and prevents uneven stress on the bolts. This is important because uneven stress can lead to bolts becoming loose or breaking over time. By torquing in a staggered sequence, each bolt is tightened gradually and evenly, reducing the risk of damage and ensuring a secure and stable connection.

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81. What type of washer is used to prevent corrosion of dissimilar metals?

Explanation

Plain washers are used to prevent corrosion of dissimilar metals because they provide a barrier between the two metals, preventing direct contact and reducing the risk of galvanic corrosion. Galvanic corrosion occurs when two different metals are in contact with each other in the presence of an electrolyte, such as moisture. The plain washer acts as a protective layer, preventing the metals from coming into direct contact and reducing the likelihood of corrosion.

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82. Swirl-type fuel nozzles usually are used to provide what type of flame speed?

Explanation

Swirl-type fuel nozzles are designed to create a swirling motion in the fuel-air mixture, which enhances the mixing and combustion process. This leads to a more efficient and faster combustion, resulting in a higher flame speed. Therefore, swirl-type fuel nozzles are typically used to provide a high flame speed.

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83. When used for ground operation, the SGT engine can be installed on

Explanation

The SGT engine, when used for ground operation, can be installed on a four-wheel trailer. This suggests that the engine is designed to be mobile and easily transported. Installing it on a four-wheel trailer allows for better stability and maneuverability during ground operations.

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84. The purpose of the exhaust duct is to

Explanation

The purpose of the exhaust duct is to straighten the exhaust gas-flow. This means that the duct is designed in a way that minimizes turbulence and allows the exhaust gases to flow in a straight and smooth manner. Straightening the exhaust gas-flow helps to improve the efficiency of the exhaust system and reduce any potential restrictions or backpressure.

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85. Three types of turbine and vane assemblies used in jet engines are impulse, reaction, and

Explanation

The correct answer is "reaction-impulse." This answer suggests that there are turbine and vane assemblies used in jet engines that combine both the reaction and impulse principles. The reaction principle involves the change in momentum of the fluid as it passes through the turbine, while the impulse principle involves the change in momentum due to the impact of the fluid on the turbine blades. Therefore, the reaction-impulse turbine and vane assembly combines both of these principles in its operation.

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86. The three major sections of all jet engines are compressor, combustion, and

Explanation

The three major sections of all jet engines are the compressor, combustion, and turbine. The compressor is responsible for compressing incoming air, the combustion section ignites the fuel-air mixture to produce high-pressure gases, and the turbine extracts energy from the high-pressure gases to power the compressor and other engine components. The exhaust section then releases the gases after they have passed through the turbine. Therefore, the correct answer is turbine.

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87. What is the composition of JP–8 fuel?

Explanation

JP-8 fuel is a type of jet fuel used by the military. It is a mixture of kerosene and gasoline. This combination provides the necessary properties for jet engines to function efficiently. Kerosene provides the high energy density required for long flights, while gasoline improves the cold weather performance of the fuel. Therefore, the correct answer is gasoline and kerosene.

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88. The purpose of a fuel/oil cooler in a fuel system is to

Explanation

The purpose of a fuel/oil cooler in a fuel system is to heat the fuel and cool the oil. This is important because fuel needs to be heated to a certain temperature in order to maintain its viscosity and ensure proper combustion. On the other hand, oil needs to be cooled to prevent it from overheating and losing its lubricating properties. Therefore, a fuel/oil cooler serves the purpose of maintaining the optimal temperature for both fuel and oil in a fuel system.

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89. Who monitors flying and maintenance schedules, and maintains visibility of fleet health indicators?

Explanation

The Maintenance Operations Center is responsible for monitoring flying and maintenance schedules, as well as maintaining visibility of fleet health indicators. This means they oversee the scheduling and coordination of aircraft maintenance and repairs, ensuring that all aircraft are properly maintained and in good working condition. They also track and analyze fleet health indicators to identify any potential issues or trends that may require attention.

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90. In addition to determining the condition of a repaired or overhauled engine, you also test engines

Explanation

Engines that have been involved in an incident or mishap need to be tested to determine their condition. This is important because the engine may have been damaged during the incident and it needs to be checked for any potential issues or malfunctions. Testing these engines allows for a thorough evaluation of their performance and ensures that they are safe and reliable for future use.

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91. On the T56 engine, how many and what type of fuel pumps are contained in the fuel pump and filter assembly?

Explanation

The correct answer is 2 gear; 1 boost. This means that the fuel pump and filter assembly on the T56 engine contains two gear pumps and one boost pump. The gear pumps are responsible for supplying fuel to the engine, while the boost pump provides additional pressure to ensure proper fuel flow.

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92. Prior to starting any maintenance on the aircraft, what can you do to ensure that it is safe to proceed?

Explanation

To ensure that it is safe to proceed with maintenance on the aircraft, it is important to check with other personnel working inside or outside the aircraft. This is because they may have valuable information or observations about the aircraft that could affect its safety. By communicating with others, potential hazards or issues can be identified and addressed before starting the maintenance process.

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93. In an engine oil tank, which device separates the air from the oil?

Explanation

A deaerator is a device used in an engine oil tank to remove air from the oil. It works by heating the oil and allowing the air to escape as bubbles. The deaerator then separates the air from the oil, ensuring that only pure oil is circulated in the engine. This helps to prevent air bubbles from causing damage or reducing the effectiveness of the oil in lubricating the engine components.

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94. If you are TDY and IMDS and SBSS are not available, what form would you use to order an engine part?

Explanation

If you are TDY (Temporary Duty) and both IMDS (Integrated Maintenance Data System) and SBSS (Standard Base Supply System) are not available, you would use AF IMT 2005 to order an engine part. This form is specifically designed for requesting and tracking parts and supplies in the Air Force. AFTO Form 349 and AFTO Form 350 are maintenance forms used for different purposes, while DD Form 1574 is a document used for receiving and transferring property. Therefore, AF IMT 2005 is the most appropriate form for ordering an engine part in this scenario.

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95. To become an equipment custodian, you must be appointed by the

Explanation

To become an equipment custodian, one must be appointed by the commander. This indicates that the commander has the authority to select individuals for this role. The commander is typically the highest-ranking officer in a military unit or organization, and they have the responsibility of making important decisions, such as appointing personnel to specific positions. Therefore, it makes sense that the commander would have the authority to appoint someone as an equipment custodian.

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96. What is the maximum voltage that can be measured if the range button is set at 30 on the Fluke 8025A multimeter?

Explanation

The maximum voltage that can be measured if the range button is set at 30 on the Fluke 8025A multimeter is 32.

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97. What component heats augmentor fuel to provide better vaporization and combustion?

Explanation

The fuel/oil cooler is responsible for heating the augmentor fuel to improve its vaporization and combustion. By heating the fuel, it becomes more easily vaporized and mixed with air, leading to more efficient and complete combustion. This ultimately enhances the performance of the system.

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98. You can identify the various system lines used to transfer fluids and gases on jet engines by

Explanation

The correct answer is the coded bands of colored tape placed around the tubing or hoses. This is because the question is asking how to identify the various system lines used to transfer fluids and gases on jet engines. The other options mentioned, such as international orange color, different colors of tubing or hoses, and specifications embossed on the tubing or hoses, do not specifically address the method of identification. However, the coded bands of colored tape provide a clear and specific way to identify the system lines.

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99. On the 54H60–91 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?

Explanation

The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly.

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100. To determine whether an engine stored in a shipping container is serviceable or repairable, look on the

Explanation

To determine whether an engine stored in a shipping container is serviceable or repairable, one should look at the top half on the right panel of the container. This is where the information or data plate indicating the condition of the engine is located.

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101. Besides maintaining the optimum blade phase angle relationship between all propellers, what else does synchrophasing do?

Explanation

Synchrophasing is a system that ensures all propellers in an aircraft are rotating at the same speed. This is important because it helps maintain the optimum blade phase angle relationship between the propellers, which improves the efficiency and reduces vibrations. By keeping the propellers rotating at the same speed, synchrophasing helps achieve smooth and balanced operation of the aircraft's propellers.

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102. Primary airflow in the F108 engine is through all of the following components except the

Explanation

The primary airflow in the F108 engine is responsible for providing air to various components for combustion and power generation. The booster, core engine, and low-pressure turbine all require primary airflow for their functioning. However, the accessory gearbox does not require primary airflow as it is responsible for driving various accessories such as generators, pumps, and hydraulic systems, rather than directly contributing to the engine's power generation.

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103. On the T56 turboprop engine, what is the overall reduction ratio of the RGB's main reduction gear train?

Explanation

The overall reduction ratio of the RGB's main reduction gear train on the T56 turboprop engine is 13.54 to 1.

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104. On GTCP165 engine shutdown, what valve closes to ensure fuel-flow is terminated?

Explanation

The fuel shutoff solenoid is the valve that closes to ensure fuel flow is terminated during GTCP165 engine shutdown. This solenoid is responsible for stopping the flow of fuel to the engine, preventing any further combustion and shutting down the engine safely.

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105. On an GTCP165 engine oil system, air that leaks past various oil seals exits through the

Explanation

On a GTCP165 engine oil system, air that leaks past various oil seals exits through the vent system. The vent system is designed to release any excess air or pressure that may build up within the oil system. This helps to prevent any damage or malfunction caused by excessive pressure. The vent system acts as a pathway for the air to escape, ensuring that the oil system remains properly pressurized and functioning efficiently.

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106. The parts on a can-annular combustion section must be removed in a specific order because of the

Explanation

The parts on a can-annular combustion section must be removed in a specific order because of the combustion chamber crossover tubes. This is because the combustion chamber crossover tubes connect the individual combustion chambers within the can-annular configuration. Removing these tubes before other parts ensures that the combustion chambers are properly sealed and that the fuel flow and combustion process are not disrupted.

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107. After reviewing the aircraft/engine forms, where should you begin troubleshooting?

Explanation

Based on the given options, the best place to begin troubleshooting after reviewing the aircraft/engine forms is to observe gauge indications. This is because gauge indications provide real-time information about the performance and status of the different systems in the aircraft/engine. By observing the gauge indications, any abnormalities or deviations from the normal operating parameters can be identified, which can then help in narrowing down the possible causes of the issue and guide further troubleshooting steps.

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108. The N2 tachometer generator is usually driven from the tachometer drive located on the

Explanation

The N2 tachometer generator is typically driven from the tachometer drive located on the engine accessory section. This means that the generator is connected to and driven by a component on the engine accessory section, which is responsible for powering and controlling various accessories and systems of the engine. The engine accessory section is a logical choice for driving the tachometer generator as it allows for accurate measurement of the engine's rotational speed.

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109. What is used to support the fan and low pressure turbine?

Explanation

Bearings are used to support the fan and low pressure turbine. Bearings are mechanical devices that reduce friction between moving parts and support the weight of rotating components. In this case, the fan and low pressure turbine require support to ensure smooth rotation and minimize wear and tear. Bearings provide this support by allowing the rotating parts to move freely while reducing friction and maintaining stability. Therefore, bearings are the correct answer for this question.

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110. On fuel controls that require setting during an engine trim, calibration and/or adjustment screws must be

Explanation

In fuel controls that require setting during an engine trim, the calibration and/or adjustment screws must be safety sealed and/or lockwired. This is necessary to prevent unauthorized or accidental tampering with the settings. Safety sealing and lockwiring ensure that the screws remain in their designated positions and do not get adjusted or tampered with unintentionally, which could lead to incorrect engine performance and potential safety hazards.

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111. On the F100-PW–220 engine, which component controls the augmentor fuel control?

Explanation

The DEEC (Digital Electronic Engine Control) controls the augmentor fuel control on the F100-PW-220 engine. The DEEC is responsible for monitoring and adjusting various engine parameters, including fuel flow, to optimize engine performance. It ensures that the correct amount of fuel is delivered to the augmentor, which is a component that increases thrust in the engine. Therefore, the DEEC is the component that controls the augmentor fuel control.

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112. Before moving an aircraft into the hush house, you must inspect the aircraft

Explanation

Before moving an aircraft into the hush house, it is necessary to inspect the aircraft and its forms. This means that not only the physical condition of the aircraft needs to be checked, but also any necessary paperwork or documentation related to the aircraft must be reviewed. This ensures that the aircraft is in proper working order and all necessary paperwork is in order before it is moved into the hush house.

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113. On an F108-CF–100 engine, the fuel injectors contain

Explanation

The fuel injectors on an F108-CF–100 engine contain both primary and secondary fuel flow passages. This means that they are capable of delivering fuel through two different channels. The primary fuel flow passages are responsible for delivering the main fuel supply to the engine, while the secondary fuel flow passages provide an additional fuel supply for certain engine operations or conditions. Having both primary and secondary fuel flow passages allows for more precise control of the fuel delivery and better engine performance.

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114. Which Air Force instruction defines quality maintenance and requires maintenance personnel to display integrity and comply with all written guidance?

Explanation

Air Force instruction 21–101 defines quality maintenance and requires maintenance personnel to display integrity and comply with all written guidance.

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115. In which type of TO would you find a list of TOs for a specific category of equipment?

Explanation

In the given options, the Index is the type of TO where you would find a list of TOs for a specific category of equipment. The Index serves as a reference guide or a catalog that lists all the technical orders (TOs) available for different categories of equipment. It helps users quickly locate the specific TO they need for a particular type of equipment, making it easier to access the necessary information for maintenance, operation, or other purposes.

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116. How can you tell when the text or a picture in a TO has been changed?

Explanation

When the text or picture in a TO has been changed, it will be indicated by a bold vertical black line alongside the affected text or picture.

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117. Which AFTO IMT 22 recommendation would you submit which, if not corrected, could cause personnel injury or damage to equipment or property?

Explanation

The correct answer is "Urgent". The term "Urgent" implies that the recommendation needs to be submitted promptly as it involves a situation that, if not corrected, could potentially lead to personnel injury or damage to equipment or property. This indicates that the issue is of high importance and requires immediate attention to prevent any potential harm.

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118. To document information concerning the status of engine TCTO, use AFTO Form

Explanation

To document information concerning the status of engine TCTO, use AFTO Form 95.

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119. When you receive an engine in your shop, you should check the applicable forms and then

Explanation

When you receive an engine in your shop, checking the compressor inlet is important because it allows you to inspect the condition of the engine's air intake system. This is crucial for ensuring that the engine is receiving clean and sufficient air for optimal performance. By checking the compressor inlet, you can identify any potential issues such as blockages or damage that may affect the engine's efficiency. This step is essential in the overall inspection process to ensure the engine's proper functioning.

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120. The purpose of the 54H60–91 propeller pitchlock assembly is to prevent

Explanation

The purpose of the 54H60-91 propeller pitchlock assembly is to prevent an engine overspeed due to a loss of hydraulic pressure. This means that if there is a loss of hydraulic pressure, the propeller pitchlock assembly will engage and prevent the propeller from spinning too fast, which could cause an overspeed of the engine. This safety mechanism helps to protect the engine from damage and ensures the proper functioning of the aircraft.

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121. On the F108 engine, the purpose of the HPT nozzle assembly is to accelerate the energy from the combustion gases to drive the

Explanation

The HPT nozzle assembly on the F108 engine is responsible for accelerating the energy from the combustion gases. This accelerated energy is then used to drive the HPT rotor.

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122. During normal governing operation, what stabilizes the propeller governor during rapid throttle movements?

Explanation

The throttle anticipation circuit is responsible for stabilizing the propeller governor during rapid throttle movements. This circuit is designed to anticipate changes in throttle position and adjust the propeller pitch accordingly, ensuring a smooth and consistent operation. It helps to prevent any sudden or drastic changes in propeller speed, providing stability and control during throttle adjustments. The tachometer generator, feedback potentiometer, and speed stabilization circuit are not specifically designed for this purpose and do not have the same function as the throttle anticipation circuit.

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123. What percentage of the total engine thrust does the secondary airflow on the F108 engine produce?

Explanation

The secondary airflow on the F108 engine produces 80% of the total engine thrust.

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124. The purpose of the T56 safety coupling is to

Explanation

The T56 safety coupling is designed to disconnect the power section from the RGB (Reduction Gearbox) assembly. This is important for safety reasons, as it allows for the power section to be separated from the propeller in case of emergencies or malfunctions. By disconnecting the power section, the propeller can be stopped or controlled independently, preventing any potential damage or accidents that may occur if the power section remains connected.

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125. On an F108 engine, the radial drive shaft connects the core engine to the

Explanation

The radial drive shaft on an F108 engine connects the core engine to the accessory drive assembly. The accessory drive assembly is responsible for driving various components such as the generator, hydraulic pump, and fuel pump. It is an essential part of the engine that ensures the proper functioning of these accessories.

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126. Which type of defect appears on bearings as a result of bearing parts striking together?

Explanation

Nicks are a type of defect that appear on bearings as a result of bearing parts striking together. When the bearing parts collide or impact each other, small chips or dents can be created on the surface, which are known as nicks. These nicks can affect the performance and longevity of the bearing, leading to potential failures or malfunctions.

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127. A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, an indicator, and

Explanation

A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, an indicator, and a resistor. The thermocouples measure the temperature of the exhaust gas, and the leads transmit this information to the indicator. The indicator then displays the EGT reading to the pilot or operator. The resistor is a component of the system that helps regulate the electrical current flowing through the thermocouples and leads, ensuring accurate temperature measurements are obtained.

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128. When the null orifice on the T56 engine TD valve is set at zero, how much fuel will the valve bypass?

Explanation

When the null orifice on the T56 engine TD valve is set at zero, it means that there is no bypassing of fuel through the valve. Therefore, the valve will not bypass any fuel, resulting in 0% bypass.

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129. To avoid the engine exhaust blast, what is the minimum distance in feet to the rear of the aircraft?

Explanation

To avoid the engine exhaust blast, the minimum distance in feet to the rear of the aircraft is 200. This distance is necessary to ensure the safety of individuals and prevent any harm caused by the powerful blast of the engine exhaust. Being within this range could potentially lead to burns, injuries, or damage to property. Therefore, it is crucial to maintain a minimum distance of 200 feet to ensure the safety of everyone in the vicinity of the aircraft.

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130. When an engine is not operating, static preload for a carbon oil seal is provided by

Explanation

When an engine is not operating, the static preload for a carbon oil seal is provided by spring pressure. This means that the carbon oil seal is compressed by a spring, creating a tight seal and preventing any leakage of oil. Air pressure, oil pressure, and hydraulic pressure are not suitable for providing static preload as they may vary or fluctuate, whereas a spring can maintain a constant pressure.

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131. Hazardous waste storage areas must prevent

Explanation

Hazardous waste storage areas must prevent unauthorized entry to ensure the safety and security of the stored materials. Unauthorized entry can lead to accidents, theft, or intentional harm to the environment or individuals. By restricting access to authorized personnel only, the risk of mishandling or misuse of hazardous materials is minimized, reducing the potential for accidents or harm.

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132. The primary goal of the ET&D program is to prevent or limit damage to turbine engines by

Explanation

The primary goal of the ET&D program is to focus on early detection of performance degradation and/or failures in turbine engines. This implies that the program aims to identify any potential issues or problems in the engines before they escalate and cause significant damage. By detecting these issues early on, the program can take preventive measures to limit damage and ensure the smooth functioning of the engines. The other options, such as reviewing past engine accident investigation reports, tracking serially controlled components, and documenting engine overspeed and overtemperature conditions, may be important aspects of the program but are not its primary goal.

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133. What engine section houses the JFS combustion section?

Explanation

The turbine plenum is the engine section that houses the JFS (Jet Fuel Starter) combustion section. The JFS is responsible for providing initial rotation to start the engine, and it is located within the turbine plenum.

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134. On the 54H60–91 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?

Explanation

In the given question, if the main filter becomes clogged, the valve that opens to assure continued flow is the bypass valve. The bypass valve allows the fluid to bypass the clogged filter and continue flowing through the system. This ensures that there is no interruption in the flow of fluid, preventing any damage or malfunction caused by a clogged filter.

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135. For the safety coupling to disconnect the power unit from the RGB, torque must reach between

Explanation

The safety coupling is designed to disconnect the power unit from the RGB when a certain torque is reached. In this case, the torque range for the safety coupling to disconnect is between -4,200 and -7,200 inch-pounds. This means that if the torque applied to the coupling exceeds -7,200 inch-pounds, or falls below -4,200 inch-pounds, the coupling will disconnect, ensuring the safety of the power unit and the RGB.

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136. What effect does the divergent design of a diffuser have on air pressure?

Explanation

The divergent design of a diffuser increases air pressure. A diffuser is a device that is used to slow down the flow of a fluid, in this case, air. The divergent design of a diffuser means that the cross-sectional area of the diffuser increases gradually. As the air flows through the diverging section of the diffuser, its velocity decreases and pressure increases. This is because the increase in cross-sectional area allows the air to expand, resulting in an increase in pressure. Therefore, the correct answer is that the divergent design of a diffuser increases pressure.

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137. Core engine fuel flow sequence on an F100-PW–220 engine starts at the main fuel pump and then goes through the

Explanation

The correct answer is the sequence of the core engine fuel flow on an F100-PW-220 engine. It starts at the main fuel pump, then goes through the main fuel control, fuel/oil cooler, pressurizing and dump valve, and finally the fuel nozzles.

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138. Engines are mounted in the fixed test cell on a thrust stand or are suspended

Explanation

Engines are mounted in a fixed test cell on a cradle mount. This means that the engines are secured and supported by a cradle-like structure. This method allows for stability and control during testing, ensuring that the engines are securely held in place while measurements and evaluations are conducted. The cradle mount provides a safe and reliable way to suspend the engines in the test cell, allowing for accurate testing and analysis of their performance.

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139. Which type of oil cooler operates on the same principle as a radiator in an automobile?

Explanation

An oil cooler that operates on the same principle as a radiator in an automobile is an air oil cooler. Just like a radiator cools the engine coolant by passing air through it, an air oil cooler cools the oil by passing air over it. This type of oil cooler uses the same concept of heat exchange with air to dissipate the heat from the oil, similar to how a radiator dissipates heat from the engine coolant.

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140. The valve that allows fluid to flow in only one direction is the

Explanation

The valve that allows fluid to flow in only one direction is called a check valve. This type of valve is designed to prevent backflow and ensure that fluid can only flow in a single direction. It typically consists of a movable disc or ball that opens when the fluid flows in the correct direction and closes to prevent any reverse flow. This is different from other options like relief, bypass, and pressurizing valves, which serve different purposes in controlling fluid flow.

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141. On a disassembled engine, a visual inspection of the combustion chamber is preferred over borescope inspection because

Explanation

A visual inspection of the combustion chamber is preferred over borescope inspection because it allows for the possibility of spotting defects that may have been missed with the borescope. This suggests that the borescope inspection may not be as thorough or effective in identifying all potential issues within the combustion chamber. It does not necessarily mean that the limits for a visual inspection are looser or that the borescope may not always be available. Additionally, the speed of removal of the combustion chamber is not mentioned as a factor in favor of visual inspection.

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142. Through extensive testing, engine manufacturers determine how long a particular part should last. This is known as the

Explanation

Engine manufacturers determine how long a particular part should last through extensive testing. This duration is known as the service life of the part. It represents the anticipated period during which the part is expected to function properly before any failure occurs. This term is commonly used in the field of engineering and manufacturing to estimate the longevity of components and ensure their reliability.

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143. Within how many hours must Category I DR be forwarded to the screening point?

Explanation

Category I DR must be forwarded to the screening point within 24 hours.

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144. What is the purpose of a borescope inspection on an engine?

Explanation

A borescope inspection on an engine is conducted to visually inspect internal cavities. This involves using a flexible tube with a camera attached to it to examine hard-to-reach areas inside the engine. By conducting this inspection, technicians can identify any potential issues or damage that may be present within the engine. This allows them to assess the condition of the engine and determine if any repairs or maintenance are necessary.

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145. What are the type(s) of view(s) available with the rigid borescope?

Explanation

The rigid borescope offers two types of views: direct and lateral. The direct view allows the user to see straight ahead, while the lateral view provides a side view. These two views give the user flexibility and a comprehensive view of the object or area being inspected.

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146. How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?

Explanation

The compensating network in the synchrophaser unit allows the speed bias motor to correct a change in rpm of 2%. This means that the motor can adjust the speed by 2% to maintain synchronization and balance between different parts of the system.

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147. On the T56 turboprop engine, which compressor section assembly disperses compressor discharge air and directs it to the combustion chambers?

Explanation

The diffuser on the T56 turboprop engine is responsible for dispersing the compressor discharge air and directing it to the combustion chambers. It is a crucial component that helps to regulate the airflow and pressure within the engine, ensuring efficient combustion and power generation. The compressor rotor, compressor housing, and compressor air inlet housing are all important parts of the engine's compressor section, but they do not specifically disperse the compressor discharge air and direct it to the combustion chambers.

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148. An understanding of the operating principles of engine instruments will help you decide

Explanation

Understanding the operating principles of engine instruments is important for interpreting the readings they provide. By knowing the meanings of the instrument readings, one can determine the current state and performance of the engine. This knowledge is essential in making decisions such as whether the engine should be removed from the aircraft or sent to the test cell for further examination. Additionally, understanding instrument readings helps in diagnosing any potential issues or malfunctions in the engine, allowing for timely maintenance and repair.

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149. The fuel system component of a jet engine that operates by using a water wheel concept is the

Explanation

A fuel-flow transmitter is a component of a jet engine's fuel system that operates using a water wheel concept. This means that it measures the flow rate of fuel by utilizing a mechanism similar to a water wheel. It is responsible for transmitting information about the fuel flow to other systems or instruments in the aircraft, allowing for accurate monitoring and control of fuel consumption.

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150. What type of fuel control uses items such as thermocouples, relays, amplifiers, and solenoids to help control a jet engine?

Explanation

Electrohydromechanical fuel control uses items such as thermocouples, relays, amplifiers, and solenoids to help control a jet engine. This type of fuel control combines electrical, hydraulic, and mechanical components to regulate the flow of fuel to the engine based on various inputs and conditions.

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151. Prior to starting the engine when doing an anti-ice valve operational check on an F–16C/D, place the anti-ice engine switch to

Explanation

When doing an anti-ice valve operational check on an F-16C/D, the anti-ice engine switch should be placed in the OFF position. This is because the purpose of the check is to ensure that the anti-ice valve is functioning properly. By placing the switch in the OFF position, it allows for a controlled test of the valve without the engine actually running. If the switch was placed in any other position (ON, START, or MANUAL), it could potentially activate the anti-ice system and interfere with the test.

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152. A portable test cell is not equipped with a

Explanation

A portable test cell is not equipped with a hydraulically operated pylon mount cradle. This means that the test cell does not have a device that can securely hold and operate the pylon mount using hydraulic power. The other options, such as a control cab, thrust trailer, and miscellaneous equipment kit, may be present in a portable test cell, but the hydraulically operated pylon mount cradle is not included.

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153. On the T56 engine, what compares the desired throttle setting from the coordinator with the actual TIT signal from the thermocouples?

Explanation

The TD amplifier on the T56 engine compares the desired throttle setting from the coordinator with the actual TIT (Turbine Inlet Temperature) signal from the thermocouples. It is responsible for ensuring that the engine operates at the desired power level by adjusting the throttle accordingly based on the TIT readings. The TD amplifier plays a crucial role in maintaining the engine's performance and efficiency.

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154. How far does a propeller's axis of rotation extend?

Explanation

The correct answer is 10 feet to the front and 5 feet from the rear. This means that the axis of rotation of a propeller extends 10 feet in front of the propeller and 5 feet behind it. This information is important for understanding the clearance required for safe operation of the propeller and any potential hazards that may be present within this range.

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155. What does a completed AFTO Form 350 serve to identify?

Explanation

A completed AFTO Form 350 serves to identify the origin of an item. This form is used in the United States Air Force to track the history and maintenance of equipment. By completing this form, the origin of the item can be determined, providing important information about its history and previous maintenance.

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156. Which characteristic is the most common cause of bearing failure?

Explanation

Complete loss of lubrication is the most common cause of bearing failure because lubrication is essential for reducing friction and preventing wear and tear between the moving parts of a bearing. Without proper lubrication, the bearing becomes susceptible to increased friction, heat buildup, and excessive wear, leading to failure. Transient vibration, partial loss of lubrication, and stall condition overtemperature can also contribute to bearing failure, but complete loss of lubrication is the primary and most common cause.

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157. Discharge air used for aircraft engine anti-icing to heat-critical areas is taken from which engine area?

Explanation

The correct answer is Compressor. When aircraft engines require anti-icing to heat-critical areas, the discharge air is taken from the compressor. The compressor section of the engine pressurizes the incoming air, and this compressed air is then used for various purposes, including anti-icing.

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158. Which is not a Lead the Fleet/Pacer program objective?

Explanation

The objective of the Lead the Fleet/Pacer program is to accurately update scheduled maintenance requirements, evaluate engine controls and accessories, and detect any unique durability problems that might require special inspections. However, reducing customer wait time for serviceable assets is not listed as one of the program objectives.

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159. What type of rule should you use for measuring an inside diameter?

Explanation

To measure an inside diameter, a slide caliper should be used. A slide caliper is a measuring tool that has two jaws, one fixed and one movable, which can be adjusted to fit inside a circular object to measure its diameter accurately. This tool allows for precise measurements and is commonly used in various industries such as engineering and manufacturing. The other options mentioned, such as a hook, narrow, or 6-inch steel, are not suitable for measuring inside diameters.

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160. On the F108 engine, the LPT shaft assembly connects the fan shaft with the

Explanation

The correct answer is LPT rotor. The LPT shaft assembly connects the fan shaft with the LPT rotor. The LPT (Low-Pressure Turbine) rotor is a component of the engine that is responsible for extracting energy from the high-velocity gas flow and converting it into rotational motion. The LPT rotor is connected to the fan shaft, which drives the fan blades. This connection allows the LPT rotor to receive power from the fan shaft and convert it into useful work in the form of rotational motion.

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161. Mechanical governing provides the foundation for what other propeller governing modes?

Explanation

Mechanical governing is a propeller governing mode that provides the foundation for both normal and synchrophasing modes. Normal governing is the basic mode that controls the propeller speed and pitch based on the engine power lever position. Synchrophasing, on the other hand, is an advanced mode that synchronizes the speeds of multiple propellers on a multi-engine aircraft to reduce noise and vibration. Therefore, the correct answer is normal and synchrophasing.

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162. The purpose of an augmentor (afterburner) in a jet engine is to

Explanation

An augmentor, also known as an afterburner, is a component in a jet engine that increases the thrust produced by the engine. It does this by injecting additional fuel into the exhaust stream and igniting it, which increases the temperature and velocity of the exhaust gases. This increased exhaust velocity creates a greater force, resulting in augmented thrust. Therefore, the correct answer is "augment basic engine thrust."

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163. Why is the "fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc preferred?

Explanation

The "fir tree" method of attaching turbine blades to the turbine rotor disc is preferred because there is a significant temperature differential between the turbine rotor disc and the blades. This method allows for the differential expansion and contraction of the blades and disc due to the temperature difference, ensuring a secure and stable attachment.

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164. Vane-type fuel pumps used in jet engines are similar to

Explanation

Vane-type fuel pumps used in jet engines are similar to sliding-vane air compressors because both use a similar mechanism of sliding vanes to create compression or pumping action. In both cases, the vanes slide in and out of slots in a rotor, creating chambers that expand and contract to move fluid or air. This design allows for efficient and reliable pumping or compression, making sliding-vane air compressors a suitable comparison for vane-type fuel pumps in jet engines.

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165. Which F–16 operational check allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine?

Explanation

Dry motoring is the correct answer because it is an operational check that allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. This check is performed to ensure that the JFS is functioning properly and can start the engine without any issues. Wet motoring, bleed schedule, and interface operational are not relevant to starting the JFS without advancing the throttle or supplying fuel.

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166. After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of

Explanation

After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of 3 minutes. This cooling period allows the augmentor tube to dissipate the heat generated during the high-power operation. Running the engine at idle allows for a lower power output, reducing the temperature of the augmentor tube and preventing any potential damage or overheating. A 3-minute cooling period is sufficient to ensure the augmentor tube is adequately cooled before the engine can be shut down.

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167. Defects (such as cracks) that appear on the combustion chamber are aggravated by

Explanation

Defects such as cracks on the combustion chamber are aggravated by thermal cycles. Thermal cycles refer to the repeated heating and cooling of the combustion chamber during engine operation. These cycles cause the metal to expand and contract, leading to stress and fatigue on the chamber walls. Over time, this can result in the formation and propagation of cracks, which can further worsen with each thermal cycle. Therefore, thermal cycles are the main factor that aggravates the appearance of defects on the combustion chamber.

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168. If you need detailed information concerning the AF IMT 2005 codes and entries, refer to AFMAN

Explanation

The given correct answer, 23–110, is most likely referring to a specific code or entry in the AF IMT 2005. However, without further context or information, it is difficult to determine the exact meaning or significance of this code or entry. It is recommended to refer to AFMAN 23–110 for more detailed information on the AF IMT 2005 codes and entries.

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169. When a bench stock item has a type I shelf-life, it means the item

Explanation

When a bench stock item has a type I shelf-life, it means that the item has a definite non-extendible period of shelf-life. This means that the item cannot be used or stored beyond its expiration date and should not be used or returned to supply after the expiration date. It is important to adhere to the shelf-life period to ensure the quality and safety of the item.

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170. A Category I DR is used to report a deficiency

Explanation

A Category I DR is used to report a deficiency that, if uncorrected, will cause major loss or damage to equipment or a system. This means that the deficiency identified in the report is of utmost importance and needs immediate attention. If left uncorrected, it has the potential to result in significant harm or damage to the equipment or system. This category is reserved for critical issues that require urgent action to prevent any major loss or damage.

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171. The second part of a TO number gives the

Explanation

The second part of a TO number provides information about the model and series of the equipment type in the TO. This means that the TO number helps to identify the specific model and series of equipment for which the technical manual is intended. This information is important for ensuring that the correct instructions and procedures are followed for a particular equipment type.

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172. If the turbine nozzles are burned out uniformly around the whole annulus from an overtemperature condition, this is known as a

Explanation

If the turbine nozzles are burned out uniformly around the whole annulus from an overtemperature condition, it indicates a severe stall condition with disrupted cooling airflow. This means that there is a significant loss of cooling airflow, which has resulted in the severe burning out of the turbine nozzles.

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173. The vernier scale on a micrometer is used to read measurements in

Explanation

The vernier scale on a micrometer is used to read measurements in ten-thousandths of an inch. The vernier scale is a secondary scale that slides parallel to the main scale on the micrometer. It consists of smaller divisions that allow for more precise measurements. By aligning the lines on the vernier scale with the lines on the main scale, the user can determine the measurement to the nearest ten-thousandth of an inch. This level of precision is necessary in many applications, especially in industries such as manufacturing and engineering.

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174. What feature is common to all dial indicators?

Explanation

All dial indicators have the ability to amplify movement greatly. This means that even a small movement or change in position can be easily and accurately measured on the dial indicator. This feature is crucial for precise measurements and allows for greater sensitivity and accuracy in various applications such as machining, engineering, and quality control.

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175. The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel. These channels are used by which propellers?

Explanation

The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel. This indicates that the synchrophaser unit is capable of synchronizing two propellers, with one being the master and the other being the slave. Therefore, the correct answer is No. 2 and No. 3.

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176. The T700 gas generator turbine rotor drives the

Explanation

The correct answer is compressor and AGB. The T700 gas generator turbine rotor is responsible for driving both the compressor and the accessory gearbox (AGB). The compressor is essential for compressing air before it enters the combustion chamber, while the AGB is responsible for driving various accessories such as the fuel pump, oil pump, and generator. Therefore, the gas generator turbine rotor plays a crucial role in powering both the compressor and the AGB in the T700 engine.

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177. The major sections of a turboprop engine are the power unit, torquemeter assembly, and

Explanation

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178. "The combination of decreased pressure above an airfoil, and the increased pressure below the airfoil produces lift" is best described by

Explanation

According to Bernoulli's principle, as the speed of a fluid (in this case, air) increases, the pressure decreases. When air flows over an airfoil, the shape of the airfoil causes the air to move faster above it and slower below it. This creates a pressure difference, with lower pressure above the airfoil and higher pressure below it. This pressure difference generates lift, which allows the airfoil (such as an airplane wing) to generate upward force and stay in the air. Therefore, the combination of decreased pressure above an airfoil and increased pressure below it is best described by Bernoulli's principle.

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179. The filter selector switch on the vibration analyzer is used to

Explanation

The filter selector switch on the vibration analyzer allows the user to choose the appropriate filter for analyzing the vibration data. Different filters can be used to isolate specific frequencies or remove unwanted noise from the overall vibration signal. By selecting the necessary filter, the user can obtain more accurate and relevant information about the vibration characteristics of the engine or machinery being analyzed.

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180. On an F100-PW–220 engine, what component permits oil to bypass the oil filter during cold weather starts?

Explanation

The correct answer is the Filter bypass valve. During cold weather starts, the oil in the engine may be thicker and more viscous, making it difficult for it to flow through the oil filter. The filter bypass valve allows the oil to bypass the filter temporarily, ensuring that there is still sufficient lubrication to protect the engine components until the oil warms up and becomes less viscous.

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181. Selected equipment items, when returned to depot because of their design characteristics function or application, are predetermined to require

Explanation

Selected equipment items are predetermined to require overhaul when they are returned to the depot. This means that these specific items have design characteristics, function, or application that necessitate a complete overhaul to restore their functionality and performance. Overhaul involves a comprehensive inspection, repair, and replacement of components to ensure that the equipment is in optimal working condition. This process is essential to extend the lifespan of the equipment and maintain its reliability and effectiveness.

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182. Which one is not an inspection phase?

Explanation

The correct answer is Home station check (HSC). Home station check is not an inspection phase because it refers to a specific type of inspection or maintenance activity conducted at the home station or base. The other options, Fix, Look, and Preinspection, can be considered as inspection phases that involve examining, assessing, and addressing any issues or problems with a particular item or system.

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183. Careless operation of the throttle during emergency system operation could cause a compressor stall due to

Explanation

Rapid throttle movement during emergency system operation can cause a compressor stall. This is because sudden changes in throttle position can disrupt the airflow through the engine, leading to a disruption in the compression process. This can result in a decrease in engine performance or even a complete loss of power.

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184. Depot level support includes CLSS crews, depot maintenance support, maintenance assistance, and

Explanation

Depot level support refers to the maintenance and repair services provided at a central depot. This support includes various teams such as CLSS crews, depot maintenance support, maintenance assistance, and jet engine intermediate maintenance crews. Among these options, field teams are not mentioned in the given statement. Therefore, the correct answer is field teams.

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185. Why should dust caps be installed over tube ends rather than inside them?

Explanation

Installing dust caps over tube ends instead of inside them avoids the possibility of leaving the caps installed. If the caps are installed inside the tube ends, there is a chance that they may be forgotten or overlooked, leading to potential issues such as debris entering the tube or the caps interfering with the functioning of the tube. By installing the caps over the tube ends, it is easier to visually confirm that they are in place and can be easily removed when necessary.

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186. Operating procedures and practices that, if not strictly observed, may result in damage to equipment are shown in the maintenance manuals in the form of

Explanation

The operating procedures and practices that may result in equipment damage are usually shown in maintenance manuals in the form of cautions. Cautions serve as a warning or reminder to users about potential risks or dangers associated with certain actions or procedures. They are meant to be strictly observed to prevent any damage to the equipment.

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187. On the 54H60–91 propeller, which component provides a means for balancing the propeller?

Explanation

The hub mounting bulkhead provides a means for balancing the propeller on the 54H60-91 propeller. Balancing the propeller is important to ensure smooth operation and reduce vibrations. The hub mounting bulkhead is responsible for securely attaching the propeller to the hub, and it also allows for adjustments to be made to achieve proper balance.

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188. On the 54H60–91 propeller, which pump is used to feather or unfeather the propeller during static propeller operation?

Explanation

The auxiliary pump is used to feather or unfeather the propeller during static propeller operation on the 54H60-91 propeller.

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189. The impeller wheel and two turbine wheels in the turbine section of the GTCP165 engine are connected by

Explanation

The impeller wheel and two turbine wheels in the turbine section of the GTCP165 engine are connected by a common shaft. This means that all three components are linked together and rotate as a single unit. This arrangement allows for efficient transfer of power and ensures that the impeller and turbine wheels work together effectively to generate thrust or power.

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190. When in the primary mode, what controls the operation of the F100-PW–220 engine?

Explanation

The DEEC (Digital Electronic Engine Control) controls the operation of the F100-PW-220 engine when in the primary mode. DEEC is responsible for monitoring and adjusting various engine parameters such as fuel flow, temperature, and pressure to ensure optimal performance and efficiency. It receives inputs from various sensors and adjusts the engine parameters accordingly to maintain the desired operating conditions.

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191. The primary benefit of identifying an impending failure through the OAP is

Explanation

Identifying an impending failure through the OAP (Operational Awareness Program) helps in improving safety. By detecting potential failures in advance, necessary precautions can be taken to prevent accidents and ensure the well-being of individuals. This can include conducting timely maintenance, repairs, or replacements of faulty components, thus minimizing the risk of accidents or equipment malfunctions that could harm personnel or property.

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192. A basic post-flight inspection (BPO) is done

Explanation

A basic post-flight inspection (BPO) is done after the last flight of the flying period. This is because the BPO is a comprehensive inspection that is performed to ensure the aircraft's airworthiness and to identify any issues or damage that may have occurred during the flight. By conducting the BPO after the last flight of the flying period, the inspection can be carried out when the aircraft is no longer in use, allowing for a thorough examination of all components and systems. This helps to ensure the safety and reliability of the aircraft for the next flying period.

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193. Who is responsible for ensuring that the OAP operates properly?

Explanation

The project monitor is responsible for ensuring that the OAP (presumably referring to some kind of project or operation) operates properly. This role involves overseeing the progress and performance of the project, monitoring its activities, and ensuring that it meets its objectives and requirements. The project monitor is responsible for identifying and addressing any issues or challenges that may arise during the course of the project, and for providing guidance and support to the team involved.

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194. On an F110-GE–129 engine, the anti-icing system prevents detrimental formation and accumulation of ice on front frame struts, forward centerbody, and

Explanation

The correct answer is fan inlet guide vane flaps. The anti-icing system on an F110-GE-129 engine prevents the formation and accumulation of ice on various parts of the engine, including the front frame struts, forward centerbody, and ring cowl. However, the specific component that is responsible for preventing ice formation on the fan inlet is the fan inlet guide vane flaps. These flaps help to regulate the airflow and prevent ice from forming on the fan inlet, ensuring the engine operates efficiently and safely.

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195. Which factor is not considered for borescope operator certification?

Explanation

The factor that is not considered for borescope operator certification is age. The certification process for borescope operators typically focuses on factors such as experience, maturity, and rank. Age is not a relevant factor in determining the competence and proficiency of a borescope operator.

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196. Copper tubing is not used on jet engines because it

Explanation

Copper tubing is not used on jet engines because it has a high-fatigue factor. This means that it is prone to developing cracks and failures over time due to repeated stress and vibration. Jet engines operate under extreme conditions of heat, pressure, and speed, and require materials that can withstand these demanding conditions without compromising safety and performance. Copper tubing, despite its other desirable properties such as high tensile strength, is not suitable for jet engines due to its tendency to fatigue and potentially fail under these harsh operating conditions.

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197. What information is found in Part I of an AFTO Form 244?

Explanation

Part I of an AFTO Form 244 contains information about the item being inspected or maintained. This includes the identification of the item, such as its name, model number, serial number, and any other relevant identifying information. This section helps to ensure that the correct item is being worked on and that accurate records are kept for future reference.

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198. On the 54H60–91 propeller, the output of what pump is sufficient to supply hydraulic pressure for normal propeller operation?

Explanation

The correct answer is Main pressure. The main pressure pump is capable of supplying sufficient hydraulic pressure for normal propeller operation on the 54H60-91 propeller. This pump is responsible for providing the necessary power to control and operate the propeller, ensuring its proper functioning. The auxiliary, standby, and backup pressure pumps may also play a role in the hydraulic system but are not specifically mentioned as being sufficient for normal propeller operation.

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199. What are used to retain the turbine buckets in the first-stage wheel of the T56–A–15 engine?

Explanation

Cover plate seals are used to retain the turbine buckets in the first-stage wheel of the T56-A-15 engine. Cotter pins are used to secure fasteners, curvic splines are used for torque transmission, and anti-rotation pins are used to prevent rotation. However, none of these options directly relate to retaining turbine buckets in the first-stage wheel. Therefore, the correct answer is cover plate seals.

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200. The stationary (stator) vane blades on the T56 compressor are used to

Explanation

The stationary (stator) vane blades on the T56 compressor are used to increase pressure. These blades are fixed in position and are designed to redirect the airflow, increasing its pressure as it passes through the compressor. By increasing the pressure, the stator vane blades help to compress the air and prepare it for combustion in the engine.

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On an F100-PW–220 engine, what component permits oil to bypass...
Selected equipment items, when returned to depot because of their...
Which one is not an inspection phase?
Careless operation of the throttle during emergency system operation...
Depot level support includes CLSS crews, depot maintenance support,...
Why should dust caps be installed over tube ends rather than inside...
Operating procedures and practices that, if not strictly observed, may...
On the 54H60–91 propeller, which component provides a means for...
On the 54H60–91 propeller, which pump is used to feather or...
The impeller wheel and two turbine wheels in the turbine section of...
When in the primary mode, what controls the operation of the...
The primary benefit of identifying an impending failure through the...
A basic post-flight inspection (BPO) is done
Who is responsible for ensuring that the OAP operates properly?
On an F110-GE–129 engine, the anti-icing system prevents...
Which factor is not considered for borescope operator certification?
Copper tubing is not used on jet engines because it
What information is found in Part I of an AFTO Form 244?
On the 54H60–91 propeller, the output of what pump is sufficient...
What are used to retain the turbine buckets in the first-stage wheel...
The stationary (stator) vane blades on the T56 compressor are used to
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