Volume 5. Jet Engine Troubleshooting, Operation, Testing, And Damage Analysis

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1. To become an expert troubleshooter, you must

Explanation

To become an expert troubleshooter, it is important to understand the function of each unit within each system. This knowledge allows the troubleshooter to identify and diagnose problems accurately. By understanding how each unit works and how it interacts with other units in the system, the troubleshooter can effectively troubleshoot and resolve issues. This comprehensive understanding ensures that the troubleshooter is equipped with the necessary knowledge to handle any troubleshooting scenario.

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About This Quiz
Aircraft Maintenance Quizzes & Trivia

This quiz focuses on troubleshooting, operation, testing, and damage analysis of jet engines, covering essential practices and diagnostic tools.

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2. Most engine montioring guages and instruments require some type of

Explanation

Most engine monitoring gauges and instruments require a transmitter and indicator. The transmitter is responsible for converting the physical parameters (such as temperature, pressure, or speed) into electrical signals, which are then transmitted to the indicator. The indicator, on the other hand, receives these electrical signals and displays them in a readable format for the operator. This setup allows for accurate and real-time monitoring of the engine's performance.

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3. 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 formulated to work effectively and safely on specific materials. Using the wrong cleaning agent could cause damage to the part, such as corrosion, erosion, or degradation of the material. This can lead to a loss of structural integrity and potentially render the part unusable or unsafe for operation. It is crucial to use the correct cleaning agent to ensure the longevity and proper functioning of the jet engine part.

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4. Aircraft power plant and engine intermediate maintenance technical order (TO) contain information on troubleshootin. This information is presented in the form of

Explanation

The correct answer is troubleshooting charts. Aircraft power plant and engine intermediate maintenance technical orders (TO) provide information on troubleshooting, which is presented in the form of troubleshooting charts. These charts help maintenance personnel to identify and resolve issues with the aircraft's power plant and engine systems. They typically include step-by-step instructions and flowcharts to guide the troubleshooting process and ensure efficient and accurate problem-solving.

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5. 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 and it is ready to be operated without any major concerns. This ensures that the engine can be properly tested and evaluated without any hindrances or potential safety risks.

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6. 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. By checking and verifying these numbers on the engine data plate, the accuracy of the log sheet can be maintained.

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7. Through extensive testin, engine maufacturers determine how long a particular part should last. this known as the

Explanation

Engine manufacturers determine the expected duration that a specific part should function through extensive testing. This duration is referred to as the "service life" of the part. It represents the estimated period during which the part is expected to operate effectively before experiencing any significant issues or failure.

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8. 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 information to the indicator, which displays the pressure reading. This allows the operator to monitor the oil pressure and ensure that it is within the desired range for proper functioning of the system. The relief valve and synchronous unit are not directly related to indicating the oil system's operation, making them incorrect options.

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9. 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 components that reduce friction between moving parts, allowing them to rotate smoothly. In this context, bearings are used to support the rotating blades of the fan and low pressure turbine, ensuring their stability and proper functioning. Without bearings, the blades would experience excessive friction, leading to increased wear and tear, reduced efficiency, and potential damage to the entire system.

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10. You can get information such as temperature and barometric pressure from equipment at the tecst cell sie or from

Explanation

The control tower is the correct answer because it is responsible for monitoring and controlling the air traffic at an airport. They have access to various equipment and systems that provide real-time information about the weather conditions, including temperature and barometric pressure. The control tower communicates this information to pilots and other personnel to ensure safe and efficient operations.

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11. Responsibility for the proper preventive maintenance of a test cell facility rest 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 the task. It is their duty to ensure that the necessary maintenance procedures are carried out regularly and effectively in order to keep the test cell facility in proper working condition.

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12. 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 includes a transmitter and a fuel-flow indicator. The transmitter is responsible for measuring the flow of fuel and transmitting this information to the fuel-flow indicator, which displays the fuel flow rate to the pilot. This system is crucial for monitoring and managing the fuel consumption of the aircraft during flight.

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13. Which type of vibration transducer is made up of certain cermanic comppunds 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. Therefore, when the accelerometer experiences vibrations, the crystals within it generate an electric charge proportional to the applied force, allowing for the measurement of vibration levels. This type of transducer is commonly used in various industries to monitor and analyze vibration in machinery and structures.

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14. The two types of test cells currently used in the Air Force are

Explanation

The Air Force currently uses two types of test cells: fixed and portable. Fixed test cells are permanent structures that are built in a specific location and cannot be easily moved. They are typically used for testing larger aircraft or equipment that require a more stable and controlled environment. On the other hand, portable test cells are designed to be mobile and can be transported to different locations as needed. They are often used for testing smaller aircraft or equipment that can be easily moved.

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

Explanation

A visual inspection of the combustion chamber on a disassembled engine is preferred over a borescope inspection because it allows for the possibility of spotting defects that may have been missed with the borescope. This suggests that a visual inspection provides a more comprehensive and detailed examination of the combustion chamber, potentially revealing any hidden or subtle defects that may not be easily detected with a borescope.

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16. Whch inspection is conducted by maintenance personnel after an occurrence of a specific or unuaual 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 the situation, identify any potential damages or issues, and determine the necessary actions or repairs required to restore normal functioning. A special inspection is different from routine or regular inspections as it is triggered by a specific event or condition that deviates from the norm.

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17. A typical jet engine exhaust gas temperaure (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 resistor is a crucial component in the system as it helps to regulate and control the flow of current. It plays a role in converting the temperature readings from the thermocouples into a measurable and readable value on the indicator. Without the resistor, the system would not be able to accurately measure and display the exhaust gas temperature.

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

Explanation

The oil pressure indicator receives an electrical signal from the transmitter. The transmitter is responsible for converting the physical pressure of the oil into an electrical signal that can be interpreted by the indicator. This allows the indicator to accurately display the oil pressure level in the system.

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19. Which piece of test equipment is used to troubleshoot a jet fuel starter (JFS) problem on an F-16 aircraft?

Explanation

The engine start system (ESS) tester is used to troubleshoot a jet fuel starter (JFS) problem on an F-16 aircraft. This test equipment is specifically designed to test and diagnose the engine start system, which includes the jet fuel starter. By using the ESS tester, technicians can identify and resolve any issues with the JFS, ensuring the proper functioning of the engine start system on the aircraft.

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20. Which of these is not considered a cause of foreign object damge (FOD)?

Explanation

Failure of internal parts is not considered a cause of foreign object damage (FOD). FOD refers to any damage caused to an aircraft or engine by foreign objects such as rocks, bolts, or ice. The formation of ice, ingestion of rocks, and ingestion of bolts are all examples of foreign objects that can cause FOD. However, failure of internal parts is not caused by a foreign object, but rather by internal mechanical or structural issues within the aircraft or engine.

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21. 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 not a proper troubleshooting practice because once the trouble has been isolated between specific points, it is important to focus on those points and not waste time inspecting other areas that are unrelated to the issue. This can lead to confusion and delays in resolving the problem.

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

Explanation

An understanding of the operating principles of engine instruments will help determine the meanings of the instrument readings. By knowing how the instruments work, one can interpret the readings accurately and make informed decisions about the engine. This knowledge is crucial in assessing whether the engine should be removed from the aircraft or sent to the test cell for further examination. It also aids in identifying any maintenance tools that may be required to address any issues indicated by the instrument readings.

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23. The fuel-flow indicator indicates the rate of fuel-flow as

Explanation

The fuel-flow indicator is used to measure the rate at which fuel is flowing in an aircraft. This rate is typically measured in pounds per hour, as it provides a more accurate representation of the fuel consumption over time. By measuring the fuel flow in pounds per hour, pilots can better monitor their fuel usage and make informed decisions regarding fuel management during a flight.

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24. 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 converting the rotational speed of the engine into an electrical signal. This signal is then sent to the tachometer indicator, which displays the speed in revolutions per minute (RPM) on a gauge or dial. Therefore, the correct answer is "indicator" as it is one of the primary units of the tachometer indicating system.

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

Explanation

To begin troubleshooting after reviewing the aircraft/engine forms, one should observe gauge indications. This is because gauge indications provide real-time information about the performance and functioning of various systems in the aircraft/engine. By observing the gauge indications, one can identify any anomalies or deviations from normal readings, which can help in pinpointing the specific system or unit that may be experiencing a problem. This approach allows for a more targeted and efficient troubleshooting process, as it focuses on the areas that are showing abnormal readings or indications.

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26. The exhaust nozzle position indicating system found on engines with afterburners is important because it

Explanation

The exhaust nozzle position indicating system found on engines with afterburners is important because it helps the pilot determine engine power. By providing information about the position of the exhaust nozzle, the system allows the pilot to monitor and adjust the engine's power output. This is crucial for maintaining optimal performance and efficiency during flight.

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27. One type of overheat detector unit used on aircraft engines consists of a hollow stailess-steel tube that covers

Explanation

This overheat detector unit used on aircraft engines consists of a hollow stainless-steel tube that covers two silver contacts. These contacts are likely designed to detect temperature changes and serve as a safety mechanism. When the temperature rises above a certain threshold, the contacts may come into contact with each other, completing an electrical circuit and triggering an alarm or activating a shutdown procedure to prevent engine damage or fire.

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28. What kind of engine vibration does not persist, but comes and goes?

Explanation

Transient engine vibration refers to vibrations that occur intermittently, appearing and disappearing over time. Unlike other types of vibrations that persist continuously, transient vibrations are temporary and may occur due to various factors such as changes in engine load or speed. These vibrations can be caused by sudden disturbances or fluctuations in the engine system, but they do not persist as a constant vibration.

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29. What information is used as an aid in test facility inspectons?

Explanation

Periodic inspection checklists are used as an aid in test facility inspections. These checklists provide a systematic and comprehensive guide for inspecting the facility and ensuring that all necessary requirements are met. They outline specific areas and items that need to be inspected, allowing inspectors to thoroughly assess the test facility's condition and compliance with regulations. By using these checklists, inspectors can identify any potential issues or deficiencies and take appropriate actions to rectify them.

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30. Defects (such as cracks) found during combustion chamber borescope inspections

Explanation

Defects found during combustion chamber borescope inspections are continually monitored as long as they are within limits. This means that if the defects, such as cracks, are within the acceptable limits set by the inspection criteria, they do not require immediate action like engine removal or welding. Instead, they are continuously observed to ensure they do not exceed the limits. This approach allows for ongoing monitoring and maintenance of the combustion chamber without the need for immediate replacement or repair.

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31. Which F-16 operational check allows you to start the jet fuel satrty (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 F-16 operational check that allows the jet fuel start (JFS) to be started without advancing the throttle to idle or supplying fuel to the aircraft engine. Dry motoring is a procedure where the JFS is started and run for a short period of time to ensure its proper functioning before starting the actual engine. It does not involve the use of fuel or the need to advance the throttle to idle position.

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32. 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 should the physical condition of the aircraft be checked, but also any required documentation or paperwork related to the aircraft should 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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33. Which engine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility?

Explanation

The turbine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility. This is because the turbine area is a critical component of the engine where the combustion process takes place. Any foreign objects such as debris or particles in this area can cause damage to the turbine blades, leading to decreased engine performance or even engine failure. Therefore, it is important to inspect and ensure that the turbine area is free from any FOD before operating the engine in the test cell facility.

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

Explanation

Thermal cycles refer to the repeated heating and cooling of the combustion chamber in an engine. These cycles cause the material to expand and contract, leading to stress and strain on the chamber. This stress can worsen any existing defects, such as cracks, as the cycles cause them to grow and propagate. Therefore, thermal cycles aggravate the defects on the combustion chamber.

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

Explanation

Rapid throttle movement can cause a compressor stall during emergency system operation. This is because sudden and careless manipulation of the throttle can disrupt the airflow in the compressor, leading to a stall. A compressor stall occurs when the airflow is disrupted to the point that it cannot maintain the necessary pressure and flow rate, resulting in a loss of engine power. Therefore, it is important to operate the throttle with caution and avoid abrupt movements to prevent compressor stalls during emergency system operation.

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36. 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 needs to be cooled down. This is done by running the engine at idle for a certain period of time. The correct answer is 3 minutes because this is the appropriate duration required to cool down the augmentor tube effectively. Running the engine at idle for 3 minutes allows for sufficient cooling and prevents any potential damage or overheating of the augmentor tube.

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37. 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 variable stator vanes should be investigated. Variable stator vanes are components in a gas turbine engine that help control the airflow and optimize engine performance. If these vanes are malfunctioning or not operating correctly, it can cause issues such as stalling or surging. Therefore, it is important to investigate the variable stator vanes when experiencing these problems during a test cell run.

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38. The F100-PW-220 engine monitoring system component that acquires fault data from the digital electonic engine control (DEEC) and logs the faults with the time of their occurrence is the

Explanation

The engine diagnostic unit (EDU) is the component of the F100-PW-220 engine monitoring system that acquires fault data from the digital electronic engine control (DEEC) and logs the faults with the time of their occurrence. This unit is responsible for diagnosing any issues or faults that occur in the engine and keeps a record of them. It plays a crucial role in monitoring the engine's performance and identifying any potential problems that may arise. The EDU is specifically designed for diagnostic purposes, making it the correct answer in this case.

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39. During vibration analysis, why is it necessary to meausre all parameters to identify a vibration source?

Explanation

It is necessary to measure all parameters to identify a vibration source because displacement alone may not provide enough information to determine the cause of the vibration. Displacement refers to the distance an object moves from its equilibrium position, and it can be the same in two different problems even if the underlying causes of the vibrations are different. By measuring all parameters such as frequency, amplitude, and phase, it becomes possible to analyze the complete vibration profile and accurately identify the source of the vibration.

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40. The engine remote trimmer enables you to adjust the

Explanation

The engine remote trimmer allows you to adjust the fuel control without being under the engine. This means that you can make adjustments to the fuel control system from a remote location, without having to physically be near the engine. This can be convenient and time-saving, as it eliminates the need to access the engine directly in order to make fuel control adjustments.

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41. During an inspection of the hush house you are not required ot check the

Explanation

During an inspection of the hush house, the engine being tested is not required to be checked. The hush house is a facility used for testing aircraft engines and reducing noise levels. The focus of the inspection would be on other aspects such as concrete deterioration, fire suppression system, and engine tie-down assemblies, which are more critical for safety and maintenance purposes.

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42. 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 a mishap need to be tested in addition to determining their condition after repair or overhaul. This is because such engines may have undergone damage or experienced stress during the incident or mishap, which could affect their performance and safety. Testing these engines is crucial to ensure that they are functioning properly and to identify any potential issues that may have arisen as a result of the incident or mishap.

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43. To borescope the high-pressure turbine (HPT) rotor blades, rotate the rear compressor by using the core engine rotationg device on the

Explanation

The correct answer is "accessory gearbox". To borescope the high-pressure turbine (HPT) rotor blades, the rear compressor needs to be rotated. This rotation is achieved by using the core engine rotating device, which is connected to the accessory gearbox. The accessory gearbox is responsible for transmitting power from the engine to various accessories, including the rear compressor. Therefore, rotating the rear compressor is possible by using the core engine rotating device on the accessory gearbox.

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44. 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 section of the engine houses various accessories such as the generator, hydraulic pump, and fuel pump. The tachometer drive on the engine accessory section connects to the N2 tachometer generator, which measures the rotational speed of the engine's N2 compressor. This information is crucial for monitoring and controlling the engine's performance.

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

Explanation

After the last flight of the flying period, a basic post-flight inspection (BPO) is done. This is because the BPO is a routine inspection that is conducted after each flight to ensure the aircraft is in proper working condition and ready for the next flight. By conducting the BPO after the last flight of the flying period, any issues or damages that may have occurred during the day can be identified and addressed before the aircraft is grounded for the night. This helps to maintain the safety and airworthiness of the aircraft for the next day's operations.

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46. When properly adjusted, the accuracy of the text cell N1 and N2 speed indicator will be within

Explanation

When properly adjusted, the accuracy of the text cell N1 and N2 speed indicator will be within 2 RPM. This means that the speed indicator may have a maximum deviation of 2 RPM from the actual speed. It is important to adjust the indicator correctly to ensure accurate readings and avoid any potential errors in monitoring the speed.

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47. You cna find written instruction for safe flight line vehicle operations in

Explanation

AFOSH STD 91-100 provides written instructions for safe flight line vehicle operations. This document is a standard that outlines the safety requirements and procedures for operating vehicles on the flight line. It is important for individuals working in this environment to be familiar with these instructions to ensure the safety of themselves and others. AFI 36-2903 is a regulation that pertains to dress and appearance in the Air Force, and the flight line job guide (JG) and intermediate maintenance TO are not specifically related to safe flight line vehicle operations.

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

Explanation

The engines are mounted from a cradle mount. This means that the engines are supported and held in place by a cradle-like structure. This type of mounting allows for stability and ease of testing, as the engines can be securely attached to the cradle and easily maneuvered as needed. It also provides a safe and controlled environment for testing, ensuring that the engines remain in the desired position throughout the testing process.

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49. Where would you begin your investiagation of an engine with a possible oil consumption problem?

Explanation

The correct answer is to review AFTO Form 781H, Aerospace Vehicle Flight Status and Maintenance. This form contains important information about the flight history and maintenance records of the engine. By reviewing this form, one can gather valuable insights into the engine's performance, any previous oil consumption issues, and the maintenance activities that have been performed on the engine. This information can help in identifying any patterns or potential causes of the oil consumption problem and guide further investigation.

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50. Which jet engine temperature is not measured?

Explanation

The temperature of the jet engine combustion inlet is not measured.

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51. The tachometer indicator is

Explanation

The tachometer indicator is an electric-magnetic-drag-type instrument. This means that it uses both electric and magnetic forces to operate. The instrument relies on the drag force produced by an electrically induced magnetic field to measure and display the rotational speed of an engine or motor. This type of tachometer is commonly used in automotive and industrial applications to monitor and control the speed of rotating machinery.

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52. Whit is used to indicate the amount of thrust a dual-compressor engine is producing?

Explanation

The engine pressure ratio (EPR) is used to indicate the amount of thrust a dual-compressor engine is producing. EPR is a measure of the pressure difference between the compressor inlet and the turbine outlet, and it provides a direct indication of the engine's performance. By monitoring the EPR, pilots and engineers can assess the engine's thrust output and make adjustments as necessary. EPR is a crucial parameter in engine performance monitoring and maintenance.

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53. In the fixed test cell, air for the engine intake comes through baffles located on the

Explanation

The correct answer is "ceiling of the test cell." In a fixed test cell, the air for the engine intake comes through baffles located on the ceiling of the test cell. This means that the air is being drawn from the top of the test cell rather than from the floor, side walls, or front doors. Drawing air from the ceiling helps to ensure that the air entering the engine is clean and free from any contaminants that may be present on the floor or walls of the test cell.

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54. Turnine blade fatigue failure does not result from

Explanation

Turnine blade fatigue failure does not result from blends. This means that the fatigue failure of turbine blades is not caused by blends. Fatigue failure refers to the weakening and eventual breakage of a material under repeated stress. The options given - nicks, dents, scratches, and blends - are all potential causes of damage to the turbine blades. However, blends are not a factor that contributes to fatigue failure in turbine blades.

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

Explanation

Complete loss of lubrication is the most common cause of bearing failure. Lubrication is essential for reducing friction and preventing wear and tear in bearings. When there is a complete loss of lubrication, the bearing surfaces come into direct contact with each other, leading to increased friction, heat generation, and accelerated wear. This can result in the failure of the bearing, causing it to seize, overheat, or break down. Therefore, ensuring proper lubrication is crucial for the longevity and performance of bearings.

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56. On engines with afterburners, the position of the exhaust nozzle is converted into an electrical signal by a

Explanation

A transducer is a device that converts one form of energy into another. In the context of engines with afterburners, the position of the exhaust nozzle needs to be converted into an electrical signal for monitoring and control purposes. A transducer can effectively perform this task by converting the physical position of the nozzle into an electrical signal that can be easily measured and utilized by other systems. Therefore, a transducer is the most suitable option among the given choices to convert the position of the exhaust nozzle into an electrical signal.

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57. The two types fo transducers used to measure vibration are

Explanation

The correct answer is velocity and piezoelectric accelerometer. Velocity accelerometers measure the rate at which an object is changing its position over time, giving information about the speed and direction of the vibration. Piezoelectric accelerometers use the principle of piezoelectricity to convert mechanical vibrations into electrical signals, allowing for the measurement of acceleration. These two types of transducers are commonly used in vibration measurement to provide accurate and reliable data.

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58. Hich test cell noise suppressors use water to cool the exhaust gases?

Explanation

Test cell noise suppressors use water to cool the exhaust gases in both fixed and portable setups. Water cooling is an effective method to reduce the temperature of the exhaust gases, which helps in minimizing noise levels. This cooling process can be implemented in both fixed test cell setups and portable test cell setups, allowing for noise suppression in various testing environments.

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59. To prevent damage to the load cells when you are transfering an engine to the test stand,

Explanation

To prevent damage to the load cells when transferring an engine to the test stand, it is necessary to secure the upper and lower rails. This ensures that the engine remains stable and does not cause any undue stress or movement that could potentially damage the load cells. By securely fastening the rails, the engine is held in place during the transfer, minimizing the risk of any accidents or mishaps that could harm the load cells.

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60. Where are the primary silencers positioned on an aircraft noise suppressor?

Explanation

The primary silencers on an aircraft noise suppressor are positioned against the aircraft fuselage. This placement allows them to effectively reduce noise by absorbing and dissipating sound waves before they reach the surrounding environment. By positioning the silencers against the fuselage, they can efficiently capture and minimize the noise generated by the aircraft engines, contributing to a quieter flying experience for passengers and reducing noise pollution on the ground.

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61. What inspection is done on aircraft parts that require infrequent inspections?

Explanation

Periodic (PE) inspections are performed on aircraft parts that require infrequent inspections. These inspections are conducted at specific intervals, usually determined by the manufacturer or regulatory authorities. PE inspections involve a thorough examination of the aircraft parts to ensure they are in good condition and comply with safety standards. These inspections may include visual inspections, non-destructive testing, and functional checks to detect any potential issues or wear and tear. Performing PE inspections helps to maintain the airworthiness of the aircraft and ensure the safety of the passengers and crew.

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62. What section of a compressor blade is most likely to fail?

Explanation

The section of a compressor blade that is most likely to fail is near the blade root. The blade root is the part of the blade that is attached to the rotor disk, and it experiences high stress and loads during operation. This increased stress can lead to fatigue and failure over time. Additionally, the blade root is also subject to high centrifugal forces, which can further contribute to its failure. Therefore, it is crucial to ensure proper design and maintenance of the blade root to prevent failures in compressor blades.

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63. Which testing engine is equipped witha quick engine change (QEC) kit?

Explanation

The TF39-1C testing engine is equipped with a quick engine change (QEC) kit.

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64. A portable test cell is not equipped with a

Explanation

A portable test cell is a mobile unit used for testing engines or other equipment. It is typically equipped with various components and tools necessary for testing. However, it does not include a hydraulically operated pylon mount cradle. This component is used for mounting and securing the equipment being tested, but it is not essential for the basic functioning of the test cell.

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

Explanation

A fuel-flow transmitter is a component of a jet engine's fuel system that operates using the water wheel concept. This means that it measures and transmits the rate at which fuel is flowing through the system. It is responsible for providing accurate information about the fuel flow to the engine control system, allowing for precise control of fuel consumption. This information is crucial for maintaining optimal engine performance and efficiency.

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66. The carbon seal tester simulates the effects of

Explanation

The correct answer is "compressor airflow through the carbon seal". This is because the carbon seal tester is designed to simulate the effects of the airflow from the compressor passing through the carbon seal. The purpose of the tester is to evaluate the performance and integrity of the carbon seal under these conditions. By subjecting the carbon seal to the compressor airflow, any potential issues or weaknesses can be identified and addressed before the seal is used in an actual turbine gas flow system.

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67. Inlet pressure (Pt2) is transmitted from its sensing point

Explanation

This answer suggests that the inlet pressure (Pt2) is transmitted from its sensing point through tubing. This means that the pressure is transferred using a system of tubes or pipes, rather than being transmitted electrically, mechanically, or hydraulically. Tubing is a common method for transmitting pressure as it allows for a controlled flow of fluid or gas without the need for complex electrical or mechanical systems.

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

Explanation

The filter selector switch on the vibration analyzer allows the user to select the necessary filter. This is important because different filters are used to analyze different frequencies of vibration. By selecting the appropriate filter, the user can focus on specific frequency ranges and eliminate unwanted noise or interference, thus obtaining accurate vibration measurements and analysis.

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69. Bearing failure from moisture, lack of protective oils, improper handling, or imoproper storage could cause

Explanation

Corrosion pitting can occur due to various factors such as moisture, lack of protective oils, improper handling, or improper storage. When a bearing is exposed to moisture or not properly lubricated, it can lead to corrosion which causes small pits or holes on the bearing surface. These pits can weaken the bearing and eventually lead to its failure. Therefore, corrosion pitting is a possible consequence of bearing failure caused by these factors.

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70. The test cell 1C temperature indicator displays temperatures in degrees Fahrenheit, with a range of

Explanation

The correct answer is -50 to +1,600. This is because the test cell 1C temperature indicator displays temperatures in degrees Fahrenheit, and the given range of -50 to +1,600 encompasses a wide range of temperatures that the indicator can measure.

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71. The vibration pickups on the portable test cell are cooled by

Explanation

The vibration pickups on the portable test cell are cooled by the pneumatic system. This means that the pneumatic system is responsible for cooling the vibration pickups.

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72. 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 decrease in the cooling airflow, which has resulted in the severe stall condition. The uniform burning out of the turbine nozzles suggests that the overtemperature condition has affected the entire annulus, leading to disrupted cooling airflow throughout.

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73. What type of vibration causes unneccessary engine removals and unwarranted repairs?

Explanation

Externally excited vibrations refer to vibrations that are caused by external factors such as misalignment, loose components, or faulty machinery nearby. These vibrations can lead to unnecessary engine removals and unwarranted repairs because they are not inherent to the engine itself but are caused by external factors. Identifying and addressing the external excitation source is crucial in preventing these vibrations and avoiding unnecessary maintenance.

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74. What procedure is used to ensure the fan and low pressure trubine are correctly balanced?

Explanation

The procedure used to ensure the fan and low-pressure turbine are correctly balanced is fan rotor trim balance. This involves adjusting the fan rotor to ensure that it is properly aligned and balanced, which helps to prevent any vibrations or uneven forces during operation. By achieving the correct balance, the fan and low-pressure turbine can work together efficiently and smoothly, reducing the risk of any performance issues or damage to the engine.

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75. When connected to the engine, which piece of F100-PW-100 engine test equipment becomes an engine electronic control (EEC)?

Explanation

The supervisory control system (SCS) test set becomes an engine electronic control (EEC) when connected to the engine. This test set is specifically designed to simulate and control the engine's supervisory functions, including monitoring and controlling various engine parameters such as fuel flow, temperature, and pressure. By connecting the SCS test set to the engine, it effectively takes over the role of the EEC, allowing technicians to test and troubleshoot the engine's electronic control system.

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76. The term trim means to adjust the engine systems for optimum performance per the limits in the TO. there are two methods used to trim an engine. they are

Explanation

Trim refers to the adjustment of engine systems to achieve optimal performance within the limits specified in the technical order (TO). There are two methods commonly used to trim an engine: manual and electronic. The manual method involves physically adjusting certain components or settings in the engine, while the electronic method utilizes electronic controls and sensors to make adjustments automatically. Both methods are employed to ensure that the engine operates at its best performance levels while adhering to the specified limits.

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77. How many primary air silencers are there on aircraft noise suppressors to help reduce turbine whine?

Explanation

There are two primary air silencers on aircraft noise suppressors to help reduce turbine whine.

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78. On the portable test cell, the swivel pads at the bottom of the leveling jacks ont he engine thrust trailer provide for all of the following except

Explanation

The swivel pads at the bottom of the leveling jacks on the engine thrust trailer provide for leveling the engine being tested, removal of the wheel and tire assemblies, and adjustment for rail compatibility with engine transportation trailers. However, they do not support the thrust trailer at a height of 80 inches.

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79. Which one is not an inspection phase?

Explanation

The correct answer is "home station check (HSC)". A home station check is not an inspection phase. The other options, fix, look, and preinspection, can all be considered as inspection phases.

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80. The pressures used in the operationof the engine pressure ration (EPR) system are the

Explanation

The correct answer is engine inlet total pressure and exhaust total pressure. The EPR system in an engine measures the ratio of the engine inlet total pressure to the exhaust total pressure. This ratio is used to determine the performance and efficiency of the engine. By comparing these two pressures, the EPR system can provide valuable information about the engine's operation and help optimize its performance.

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81. The vertical baffles inteh exhaust stack of the fixed test cell are desighned to remove

Explanation

The vertical baffles in the exhaust stack of the fixed test cell are designed to remove low-frequency sound. Baffles are commonly used to control and reduce noise levels in various systems. In this case, the baffles are specifically targeting low-frequency sounds, which tend to have longer wavelengths and can be more difficult to attenuate. By strategically placing the baffles in the exhaust stack, they can effectively absorb and dissipate the low-frequency sound waves, helping to minimize noise pollution in the surrounding environment.

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82. The portable test cell is not equipped with a

Explanation

The correct answer is "model 3000 trailer". This means that the portable test cell does not have a model 3000 trailer. The explanation is that the test cell is lacking this specific trailer, which could be used for various purposes such as transportation or storage. Without this trailer, the test cell may have limitations or difficulties in certain operations or functions.

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83. A cold compressor stall that occurs at low revolutions per minute (RPM) and is accompanied by a slight ovvertemperature is called

Explanation

An incipient cold compressor stall is a type of stall that occurs at low RPM and is accompanied by a slight overtemperature. It is called "incipient" because it is in the early stages or beginning of a stall. This type of stall is not severe or complete, hence the term "incipient."

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84. When checking the turbine section, you do not measure

Explanation

When checking the turbine section, you do not measure the intake gas temperature (IGT). The turbine section is responsible for converting the energy from the exhaust gases into mechanical energy to drive the compressor and other components. The temperature measurements that are typically taken in the turbine section include the fan turbine inlet temperature (FTIT), turbine inlet temperature (TIT), and exhaust gas temperature (EGT). These measurements help monitor the performance and efficiency of the turbine section and ensure that it is operating within safe limits. However, the intake gas temperature (IGT) is not typically measured in this section.

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85. During what inspection phase are opertional checks made according to the technical order (TO)?

Explanation

Operational checks are made during the post-inspection phase according to the technical order (TO). This phase occurs after the inspection is completed and is aimed at ensuring that all systems and components are functioning correctly. It involves testing and verifying the operational capabilities of the equipment or system being inspected. Therefore, post-inspection is the correct phase for conducting operational checks as per the TO guidelines.

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86. Turbine rotor blade failure usually occurs near the

Explanation

Turbine rotor blade failure usually occurs near the midspan of the blade. The midspan refers to the middle section of the blade, between the root (base) and the tip. This area is subjected to high levels of stress and strain during operation, leading to potential failure. Factors such as aerodynamic forces, vibration, and material fatigue can contribute to the failure. By understanding that midspan is the most vulnerable area, engineers can design and implement appropriate measures to prevent or mitigate blade failure.

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87. The test cell exhaust gas temperature (EGT) selector allows selection of

Explanation

The test cell exhaust gas temperature (EGT) selector allows the selection of either individual thermocouple inputs or the average of these inputs. This means that the EGT parameter can be measured separately for each thermocouple or an average value can be obtained from all the thermocouples. This provides flexibility in monitoring and analyzing the exhaust gas temperature in the test cell.

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88. To how many minutes should engine operation in afterburner to be limited when the engine is operated in the aircraft noise suppressor?

Explanation

The correct answer is 5. This suggests that the engine operation in afterburner should be limited to 5 minutes when the engine is operated in the aircraft noise suppressor. This limitation is likely implemented to reduce the overall noise generated by the aircraft during operation. By limiting the afterburner operation, the noise levels can be controlled and minimized, ensuring compliance with noise regulations and reducing the impact on surrounding areas.

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89. What is the probable cause of compressor rotor shift?

Explanation

Thrust bearing failure is the probable cause of compressor rotor shift. When the thrust bearing fails, it can cause the rotor to shift, leading to misalignment and imbalance in the compressor. This can result in reduced efficiency and performance of the compressor.

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90. Forces acting to create vibration in a jet engine present a highly complex pattern. this because the main rotor

Explanation

The forces acting to create vibration in a jet engine present a highly complex pattern. This complexity arises because the main rotor functions as a flexible rotor system. Unlike a rigid rotor system, a flexible rotor system can deform under the influence of external forces, leading to vibration. This flexibility allows the rotor to absorb some of the vibrations, reducing the overall impact on the engine. Therefore, the main rotor in a jet engine functions as a flexible rotor system to manage and mitigate vibration.

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91. The pressure gauges used for an oil system pressure checks are connected at the

Explanation

The correct answer is the "output side of the main oil pump and the vent system." This is because the pressure gauges are used to measure the pressure after the oil has been pumped by the main oil pump. Additionally, the vent system is connected to ensure any excess pressure is released properly. Connecting the gauges at this location allows for accurate monitoring of the oil system pressure.

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92. The hush house exhaust deflector is constructed of

Explanation

The hush house exhaust deflector is constructed of small panel modules filled with noise reduction material. This means that the exhaust deflector is made up of multiple small panels that are filled with a material designed to reduce noise. This construction allows for effective noise reduction while also providing flexibility and ease of installation.

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93. When testing a TF34 engine at test cell, which test is performed to ensure all operating limits and schedules from idle to maximum power are within limits?

Explanation

A transient check is performed to ensure that all operating limits and schedules of a TF34 engine, from idle to maximum power, are within acceptable limits. This test involves subjecting the engine to rapid changes in power settings to simulate real-world operating conditions. By monitoring various parameters such as temperatures, pressures, and speeds during these transient events, any deviations from the specified limits can be identified and addressed. This test helps to validate the engine's performance and ensure its safe and efficient operation across its entire power range.

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94. The noise suppressor at a oportable test cell is not equipped with

Explanation

The noise suppressor at a portable test cell is not equipped with a fuel trailer because a fuel trailer is not necessary for the functioning of the noise suppressor. The purpose of a noise suppressor is to reduce or eliminate noise produced by the test cell, and a fuel trailer is not directly related to this function. The noise suppressor may require other components such as an exhaust muffler and two air intake mufflers to effectively suppress noise, but a fuel trailer is not one of them. Similarly, a water tank semitrailer is also unrelated to the functioning of the noise suppressor.

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95. Compressor section failure from a chain reaction due to blade-to-blade and blade-to-vane interference is known as

Explanation

Compressor section failure caused by blade-to-blade and blade-to-vane interference is known as circumferential force. This force refers to the radial forces acting on the blades and vanes due to the high-speed rotation of the compressor. These forces can cause the blades and vanes to collide or rub against each other, leading to damage and failure of the compressor section.

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96. The home station check (HSC) inspection is a combination of the basic post-flight (BPO) and

Explanation

The correct answer is "hourly post-flight items." The home station check (HSC) inspection includes the completion of hourly post-flight items. This means that certain tasks and inspections need to be carried out after each flight hour to ensure the aircraft's safety and operational readiness. These items are typically routine checks that need to be performed regularly to identify any potential issues or maintenance requirements. By completing these hourly post-flight items, maintenance personnel can address any necessary repairs or adjustments promptly, ensuring the aircraft's continued airworthiness.

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97. Prior to starting the engine when doinga n anti-ice valve operational check on an F-16C/D, place the anti-ice engine switch to

Explanation

Prior to starting the engine, when performing an anti-ice valve operational check on an F-16C/D, the correct position for the anti-ice engine switch is "MANUAL". This means that the pilot needs to manually control the anti-ice system during the check. The other options, such as "ON", "OFF", and "START", are not suitable for this specific operation.

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