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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

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.

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.

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.

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.

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.

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.

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."

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.