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

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  • 1/97 Questions

    To become an expert troubleshooter, you must

    • Be a 7-level
    • Have at least 5 years experience
    • Attend college courses in troubleshootin techniques
    • Understand th function of each unit within each system
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Aircraft Maintenance Quizzes & Trivia
About This Quiz

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

Quiz Preview

  • 2. 

    Most engine montioring guages and instruments require some type of

    • Electrical valve to the indicator

    • Metal tubing for electron flow

    • Radio frequency transmitter

    • Transmitter and indicator

    Correct Answer
    A. Transmitter and indicator
    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. 

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

    • Fix-it diagrams

    • Power plant charts

    • Mechanical drawings

    • Troubleshooting charts

    Correct Answer
    A. Troubleshooting charts
    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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  • 4. 

    Using the wrong cleaning agent on a jet engine part

    • Has no effect

    • Could destroy it

    • Only causes minor etching

    • Is acceptable as long as the part comes clean

    Correct Answer
    A. Could destroy it
    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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  • 5. 

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

    • Only need replacement of minor parts

    • Be operable with all known discrepancies corrected

    • Have the fuel line disconnected from the pump inlet

    • Be in need of only minor bits and pieces to be torqued

    Correct Answer
    A. Be operable with all known discrepancies corrected
    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?

    • Type these items

    • Check past records

    • Enter these only after test is complete

    • Verify these numbers on the engine data plate

    Correct Answer
    A. Verify these numbers on the engine data plate
    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. 

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

    • Transmitter and indicator

    • Relief valve and indicator

    • Relief valve and transmitter

    • Synchronous unit and indicator

    Correct Answer
    A. Transmitter and indicator
    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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  • 8. 

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

    • Blades

    • Bearings

    • Brackets

    • Bushings

    Correct Answer
    A. Bearings
    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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  • 9. 

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

    • Anticipated failure rate

    • Guaranteed date

    • Drop dead date

    • Service life

    Correct Answer
    A. Service life
    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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  • 10. 

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

    • Transmitter and a float valve

    • Control valve and a float valve

    • Transmitter adn a fuel-flow indicator

    • Control valve and a fuel-flow transcriber

    Correct Answer
    A. Transmitter adn a fuel-flow indicator
    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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  • 11. 

    Which type of vibration transducer is made up of certain cermanic comppunds and natural crystals?

    • Velocity

    • Phase log

    • Displacement accelerometer

    • Piezoelectric accelerometer

    Correct Answer
    A. Piezoelectric accelerometer
    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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  • 12. 

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

    • Fixed and portable

    • Single and combined

    • Permanent and temporary

    • Functional and progressive

    Correct Answer
    A. Fixed and portable
    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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  • 13. 

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

    • The control tower

    • Information on the radio

    • The local weather station

    • Your immeditate supervisor

    Correct Answer
    A. The control tower
    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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  • 14. 

    Responsibility for the proper preventive maintenance of a test cell facility rest with the

    • Individuals assigned

    • Civil engineer squadron

    • Equipment maintenance squadron

    • Aerospace ground equipment (AGE) flight

    Correct Answer
    A. Individuals assigned
    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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  • 15. 

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

    • A resistor

    • A turbine inlet

    • A control valve

    • An exhaust duct

    Correct Answer
    A. A resistor
    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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  • 16. 

    The oil pressure indicator receives an electrical signal from the

    • Gyro

    • Transmitter

    • Hydraulic unit

    • Synchronous unit

    Correct Answer
    A. Transmitter
    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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  • 17. 

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

    • Supervisory control system (SCS) test set

    • Mach number (Mn) simulator test set

    • Engine start system (ESS) tester

    • Remote trimmer

    Correct Answer
    A. Engine start system (ESS) tester
    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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  • 18. 

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

    • Formation of ice

    • Ingestion of rocks

    • Ingestion of bolts

    • Failure of internal parts

    Correct Answer
    A. Failure of internal parts
    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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  • 19. 

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

    • The borescope may not alway be available

    • Removal of the combustion chamber is quicker

    • You culd spot defects that have been missed with the borescope

    • The limits for a visual inspection are not as tight as those for a borescope

    Correct Answer
    A. You culd spot defects that have been missed with the borescope
    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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  • 20. 

    Whch inspection is conducted by maintenance personnel after an occurrence of a specific or unuaual condition?

    • Special

    • Calendar

    • Acceptance

    • Time replacement item

    Correct Answer
    A. Special
    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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  • 21. 

    All of the options listed below are proper troubleshooting practices except

    • Checking the applicable trouble areas

    • Understanding the fucnction of each engine unit

    • Performing easy checks, then going to more difficult checks

    • Inspecting other areas after isolating the trouble between points

    Correct Answer
    A. Inspecting other areas after isolating the trouble between points
    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

    • If an engine should be removed from an aircraft

    • If the engine should be sent to the test cell

    • The meanings of the instrument readings

    • What tools are required for maintenance

    Correct Answer
    A. The meanings of the instrument readings
    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

    • Pounds per hour

    • Gallons per hour

    • Pounds per minute

    • Gallons per second

    Correct Answer
    A. Pounds per hour
    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

    • Indicator

    • Fuse panel

    • Transformer

    • Thermocouple

    Correct Answer
    A. Indicator
    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?

    • Discuss problem with other journeymen in the shop

    • Check each part of every system

    • Examine the most complex unit

    • Observe gauge indications

    Correct Answer
    A. Observe gauge indications
    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

    • Helps the pilot determine engine power

    • Helps the pilot determine fuel consumption

    • Gives the pilot indications of electrical failures

    • Aids the pilot in selection of proper altitude levels

    Correct Answer
    A. Helps the pilot determine engine power
    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

    • One gold contact

    • Two silver contacts

    • Three bronze contacts

    • Four copper contacts

    Correct Answer
    A. Two silver contacts
    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?

    • Forced

    • Transient

    • Resonance

    • Externally excited

    Correct Answer
    A. Transient
    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. 

    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?

    • Dry motoring

    • Wet motoring

    • Bleed schedule

    • Interface operational

    Correct Answer
    A. Dry motoring
    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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  • 30. 

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

    • Red streamers

    • And its forms

    • Flight station

    • Forms

    Correct Answer
    A. And its forms
    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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  • 31. 

    Which engine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility?

    • Fuel control

    • Turbine area

    • Inlet to the oil pump

    • Inlet to the fuel pump

    Correct Answer
    A. Turbine area
    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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  • 32. 

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

    • Test cell run procedures

    • Unit serial number listings

    • Monthly requirements listings

    • Periodic inspection checklists

    Correct Answer
    A. Periodic inspection checklists
    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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  • 33. 

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

    • Are continually monitored as long as they are within limits

    • Requried engine removal, even if thay are within limits

    • Require welding, even if they are within limits

    • Are unacceptable; you must replace the part

    Correct Answer
    A. Are continually monitored as long as they are within limits
    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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  • 34. 

    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

    • 1 minute

    • 3 minutes

    • 6 minutes

    • 9 minutes

    Correct Answer
    A. 3 minutes
    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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  • 35. 

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

    • Thermal cycles

    • Low cycle fatigue

    • Borescope inspections

    • Combustion chamber removal

    Correct Answer
    A. Thermal cycles
    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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  • 36. 

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

    • A restricted air inlet

    • Rapid throttle movement

    • A restricted turbine nozzle

    • Malfunctioning varable gemetry system

    Correct Answer
    A. Rapid throttle movement
    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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  • 37. 

    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

    • Data collection unit (DCU)

    • Ground station unit (GSU)

    • Engine analyzer unit (EAU)

    • Engine diagnostic unit (EDU)

    Correct Answer
    A. Engine diagnostic unit (EDU)
    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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  • 38. 

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

    • The compressor rotor is a freely rotating mass

    • The main rotor functions as an inflexible system

    • A change in mechanical condition will not be detected

    • Displacement may be the same in two completely differnt problems

    Correct Answer
    A. Displacement may be the same in two completely differnt problems
    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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  • 39. 

    The engine remote trimmer enables you to adjust the

    • Fuel enrchment valve without being under the engine

    • Fuel flow transmitter while under the engine

    • Fuel control without being under the engine

    • Fuel pump while under the engine

    Correct Answer
    A. Fuel control without being under the engine
    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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  • 40. 

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

    • Engine being tested

    • Concrete deterioration

    • Fire suppression system

    • Engine tie-down assemblies

    Correct Answer
    A. Engine being tested
    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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  • 41. 

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

    • For training practice

    • Inaircraft that have been washed

    • That have severe foreign object dame (FOD) damage

    • That have been involved in an incident or a mishap

    Correct Answer
    A. That have been involved in an incident or a mishap
    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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  • 42. 

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

    • Ignition exciter

    • Oil pressure pump

    • Thrust reverser pump

    • Variable stator vanes

    Correct Answer
    A. Variable stator vanes
    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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  • 43. 

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

    • Engine accessory section

    • Engine turbine section

    • Combustion case

    • Fuel control

    Correct Answer
    A. Engine accessory section
    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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  • 44. 

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

    • Variable nozzle

    • Accessory gearbox

    • Low pressure compressor

    • Borescope light guide cable

    Correct Answer
    A. Accessory gearbox
    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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  • 45. 

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

    • 1 revolutions per minute (RPM)

    • 2 RPM

    • 3 RPM

    • 4 RPM

    Correct Answer
    A. 2 RPM
    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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  • 46. 

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

    • AFI 36-2903

    • AFOSH STD 91-100

    • The flight line job guide (JG)

    • The intermediate maintenance TO

    Correct Answer
    A. AFOSH STD 91-100
    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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  • 47. 

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

    • From cargo straps

    • From a cradle mount

    • From a tailhook adapter

    • On the model 4100 trailer

    Correct Answer
    A. From a cradle mount
    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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  • 48. 

    A basic post-flight inspection (BPO) is done

    • Within the thruflight inspection

    • After the first flight of the day

    • With the end-of-runway inspection

    • After the last flight of the flying period

    Correct Answer
    A. After the last flight of the flying period
    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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  • 49. 

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

    • Inspect the compressor thrust-bearing

    • Talk withthe oil analysis program manager

    • Review AFTO Form 244, Industrial/Support Equipment Record

    • Review AFTO Form 781H, Aerospace Vehicle Flight Status and Maintenance

    Correct Answer
    A. Review AFTO Form 781H, Aerospace Vehicle Flight Status and Maintenance
    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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Quiz Review Timeline (Updated): Mar 17, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 17, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 21, 2009
    Quiz Created by
    Cezar

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