CDC 2a651s Vol. 4

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| Attempts: 75
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  • 1/100 Questions

    Which of the following is not a proper troubleshooting practice?

    • Checking the applicable trouble areas.
    • Understanding the function of each engine unit.
    • Inspecting other areas after isolating trouble between points.
    • Performing easy checks, then going to more difficult checks.
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CDC 2a651s Vol. 4 - Quiz
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  • 2. 

    In vibration analysis, frequency is usually measured in

    • Mils.

    • Phase lags.

    • Cycles per second.

    • Phases per second.

    Correct Answer
    A. Cycles per second.
    Explanation
    In vibration analysis, frequency is a measure of how many cycles per second an object or system completes. It is commonly measured in cycles per second, which is also known as Hertz (Hz). This unit of measurement helps to quantify the rate at which the vibration is occurring, providing valuable information for analyzing and understanding the behavior of the system.

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  • 3. 

    What supports the fan and low-pressure turbine?

    • Bushings.

    • Brackets.

    • Bearings.

    • Bulkheads.

    Correct Answer
    A. Bearings.
    Explanation
    Bearings 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 help to support and facilitate the rotation of the fan and low-pressure turbine, ensuring their efficient operation. Bushings, brackets, and bulkheads are not specifically designed for this purpose, making bearings the correct answer.

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  • 4. 

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

    • Only need replacing minor parts.

    • Be operable with all known discrepancies corrected.

    • Have the fuel line disconnected from the pump inlet.

    • Only need torquing of minor bits and pieces.

    Correct Answer
    A. Be operable with all known discrepancies corrected.
    Explanation
    When an engine arrives for a test run at the test cell, it must be operable with all known discrepancies corrected. This means that any issues or problems with the engine should have been identified and fixed before it is brought to the test cell. This ensures that the engine is in proper working condition and ready to be tested without any known faults or discrepancies.

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  • 5. 

    Immediately prior to an engine test cell run, you check the engine and QEC kit (if applicable) for loose nuts, bolts, lock wire, tools, or any other material in order to

    • Eliminate items that could possibly cause FOD.

    • Assure that the instrumentation is working properly.

    • Prevent wasted maintenance hours due to shutdown.

    • Eliminate items that could cause inaccurate readings.

    Correct Answer
    A. Eliminate items that could possibly cause FOD.
    Explanation
    Before conducting an engine test, it is important to check for loose nuts, bolts, lock wire, tools, or any other material that could potentially cause Foreign Object Damage (FOD). FOD refers to any object or debris that can be ingested by the engine, causing damage and potentially leading to engine failure. By eliminating these items, the risk of FOD is reduced, ensuring the safety and proper functioning of the engine during the test run.

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  • 6. 

    What inspection is given to all newly assigned aircraft?

    • Phased.

    • Special.

    • Calendar.

    • Acceptance.

    Correct Answer
    A. Acceptance.
    Explanation
    Acceptance inspection is given to all newly assigned aircraft. This inspection is conducted to ensure that the aircraft meets all the required standards and specifications before it is put into service. It involves a thorough examination of the aircraft's systems, components, and overall condition to verify its airworthiness and readiness for operation. The acceptance inspection is crucial in ensuring the safety and reliability of the aircraft before it is used for any missions or flights.

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  • 7. 

    A cold compressor stall occurring at low RPM accompanied by a slight over temperature is called

    • An incipient.

    • A thermal.

    • A partial.

    • A mild.

    Correct Answer
    A. An incipient.
    Explanation
    An incipient refers to a condition where a cold compressor stall happens at low RPM along with a slight over temperature. This term is used to describe the early stage or beginning of a particular event or condition. In this case, it signifies the initial signs of a cold compressor stall occurring at low RPM with a slight over temperature.

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  • 8. 

    To be considered effective tools for aviators, aircraft instruments must be light weight, easy to read, and

    • Be small in size.

    • Use digital readout.

    • Use analog readout.

    • Cheap to manufacture.

    Correct Answer
    A. Be small in size.
    Explanation
    The question is asking for the characteristic that aircraft instruments must have in order to be considered effective tools for aviators. Out of the given options, the only characteristic that is mentioned as a requirement is that the instruments should be small in size. This suggests that size is an important factor in determining the effectiveness of aircraft instruments, possibly due to limited space in the cockpit or the need for easy maneuverability. Therefore, the correct answer is "be small in size."

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  • 9. 

    Most engine-monitoring gauges 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 both a transmitter and an indicator. The transmitter is responsible for converting the physical measurement (such as temperature or pressure) into an electrical signal, which is then transmitted to the indicator. The indicator, on the other hand, receives the electrical signal and displays the corresponding measurement to the operator. Therefore, both components are necessary for the proper functioning of the engine-monitoring system.

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  • 10. 

    Which of these is not considered a cause of FOD?

    • Formation of ice.

    • Ingestion of bolts.

    • Ingestion of rocks.

    • Failure of internal parts.

    Correct Answer
    A. Failure of internal parts.
    Explanation
    The ingestion of foreign objects (FOD) can cause damage to aircraft engines and other components. Formation of ice, ingestion of bolts, and ingestion of rocks are all considered causes of FOD as they can lead to engine malfunctions or damage. However, failure of internal parts is not typically considered a cause of FOD, as it is usually a result of wear and tear or mechanical issues within the engine itself, rather than the introduction of a foreign object.

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  • 11. 

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

    • Inspect the compressor thrust bearing.

    • Talk with the oil analysis program manager.

    • Review AFTO Form 781H.

    • Review AFTO Form 244.

    Correct Answer
    A. Review AFTO Form 781H.
    Explanation
    To investigate an engine with a possible oil consumption problem, reviewing the AFTO Form 781H would be the appropriate starting point. This form is used to record oil consumption and other maintenance data for aircraft engines. By reviewing this form, one can gather information about the engine's oil consumption history, any previous issues, and maintenance actions taken. This can provide valuable insights and help identify potential causes or patterns related to the oil consumption problem.

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  • 12. 

    To become an expert troubleshooter, you must

    • Be a 7-level.

    • Have at least five years experience.

    • Complete college courses in troubleshooting techniques.

    • Understand the function of each unit within each system.

    Correct Answer
    A. Understand the function of each unit within each system.
    Explanation
    To become an expert troubleshooter, it is essential to understand the function of each unit within each system. This knowledge allows the troubleshooter to identify and diagnose problems accurately. Without a thorough understanding of how each unit works within a system, it would be challenging to effectively troubleshoot and resolve issues. The other options mentioned, such as being a 7-level, having experience, and completing college courses, can certainly contribute to becoming an expert troubleshooter, but understanding the function of each unit is the most crucial factor.

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  • 13. 

    The troubleshooting information contained in aircraft power plant and engine intermediate maintenance TO is presented in the form of

    • Fix-it diagrams.

    • Power plant charts.

    • Mechanical drawings.

    • Troubleshooting charts.

    Correct Answer
    A. Troubleshooting charts.
    Explanation
    The troubleshooting information in aircraft power plant and engine intermediate maintenance TO is presented in the form of troubleshooting charts. These charts provide a systematic approach to identify and solve problems that may occur in the power plant and engine systems. By following the steps and instructions in these charts, maintenance personnel can diagnose and resolve issues effectively. Fix-it diagrams, power plant charts, and mechanical drawings may provide other types of information, but for troubleshooting purposes, the TO relies on troubleshooting charts.

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  • 14. 

    Which metals are used in the EGT indicating system thermocouples?

    • Steel and iron.

    • Steel and alumel.

    • Iron and chromel.

    • Alumel and chromel.

    Correct Answer
    A. Alumel and chromel.
    Explanation
    The EGT (Exhaust Gas Temperature) indicating system thermocouples use alumel and chromel metals. Alumel is an alloy of nickel, aluminum, manganese, and silicon, while chromel is an alloy of nickel and chromium. These metals are chosen for their high temperature resistance and ability to accurately measure exhaust gas temperatures. Steel and iron, on the other hand, may not be suitable for such high temperature applications.

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  • 15. 

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

    • Velocity.

    • Phase log.

    • Displacement accelerometer.

    • Piezoelectric accelerometer.

    Correct Answer
    A. Piezoelectric accelerometer.
    Explanation
    A piezoelectric accelerometer is made of certain ceramic compounds and natural crystals. These materials have the property of generating an electric charge when subjected to mechanical stress or vibration. This type of transducer is commonly used to measure acceleration and vibration in various applications, such as structural health monitoring, automotive testing, and aerospace engineering.

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  • 16. 

    You can find written instructions for safe flight-line vehicle operations in

    • The flight-line JG.

    • AFI 36-2903.

    • The intermediate maintenance TO.

    • AFOSH STD 91-100.

    Correct Answer
    A. AFOSH STD 91-100.
    Explanation
    The correct answer is AFOSH STD 91-100. This is because AFOSH STD 91-100 provides written instructions for safe flight-line vehicle operations. AFI 36-2903 is the Air Force Instruction for Dress and Personal Appearance of Air Force Personnel, which is not directly related to flight-line vehicle operations. The intermediate maintenance TO (Technical Order) would provide instructions for maintenance procedures, not specifically for safe vehicle operations on the flight-line.

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  • 17. 

    Improperly rigged throttle linkage during a test cell run can cause

    • Fluctuating EGT.

    • Fluctuating RPM.

    • Damage to the inlet guide vanes.

    • Engine overspeed.

    Correct Answer
    A. Engine overspeed.
    Explanation
    Improperly rigged throttle linkage during a test cell run can cause engine overspeed. When the throttle linkage is not rigged properly, it can result in the engine running at a higher speed than intended. This can be dangerous as it can cause excessive wear and tear on the engine components, leading to potential damage or failure. Additionally, engine overspeed can also pose a risk to the safety of the test cell operators and equipment. Therefore, it is crucial to ensure that the throttle linkage is correctly rigged to prevent engine overspeed during test cell runs.

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  • 18. 

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

    • The control tower.

    • Information on the radio.

    • The local weather station.

    • Your immediate supervisor.

    Correct Answer
    A. The control tower.
    Explanation
    The control tower is the correct answer because it is responsible for monitoring and controlling air traffic at an airport. They have access to real-time information such as temperature and barometric pressure, which are crucial for flight operations. The control tower communicates with pilots and provides them with important weather updates and other relevant information to ensure safe and efficient operations.

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  • 19. 

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

    • Test cell run procedures.

    • Unit serial number listings.

    • Periodic inspection checklists.

    • Monthly requirements listings.

    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 organized approach to ensure that all necessary inspections are conducted regularly. They outline specific criteria and requirements that need to be met during the inspections, helping to ensure that the test facility is in compliance with regulations and standards. By using periodic inspection checklists, inspectors can effectively assess the condition and safety of the test facility and identify any potential issues that need to be addressed.

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  • 20. 

    A BPO is done

    • With 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
    The correct answer is "after the last flight of the flying period." This means that the BPO (Base Pre-flight Operation) is conducted after the final flight of the day. This is important because it allows for a thorough inspection of the aircraft to ensure that it is in proper condition before it is put away for the day. Conducting the BPO after the last flight of the flying period helps to identify any issues or maintenance needs that may have arisen during the day's flights, ensuring the safety and efficiency of future flights.

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  • 21. 

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

    • Pods.

    • An H-frame.

    • A two-wheel trailer.

    • A four-wheel trailer.

    Correct Answer
    A. A four-wheel trailer.
    Explanation
    The SGT engine can be installed on a four-wheel trailer when used for ground operation. This suggests that the engine is too heavy or requires more stability than what can be provided by a two-wheel trailer or an H-frame. The four-wheel trailer would offer better balance and support for the engine during ground operations.

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  • 22. 

    For engine shutdown on the GTCP 165 engine, what valve closes to ensure that fuel-flow is terminated?

    • Poppet.

    • Scheduling.

    • Fuel flow divider.

    • Fuel shutoff solenoid.

    Correct Answer
    A. Fuel shutoff solenoid.
    Explanation
    The fuel shutoff solenoid is the valve that closes to ensure that fuel flow is terminated during engine shutdown on the GTCP 165 engine. This solenoid is responsible for cutting off the fuel supply to the engine, effectively stopping the flow of fuel and shutting down the engine.

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  • 23. 

    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. A transmitter is a device that converts a physical quantity, in this case, the oil pressure, into an electrical signal that can be easily measured and displayed on the indicator. The transmitter is responsible for sending the accurate oil pressure information to the indicator, allowing the operator to monitor the oil pressure level in the system.

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  • 24. 

    The portable test cell’s vibration pickups are cooled by the

    • Engine oil.

    • Atmosphere.

    • Hydraulic fluid.

    • Pneumatic system.

    Correct Answer
    A. Pneumatic system.
    Explanation
    The portable test cell's vibration pickups are cooled by the pneumatic system. This means that the pneumatic system is responsible for cooling the vibration pickups in the test cell. It is likely that the pneumatic system is designed to circulate cool air or a cooling medium to prevent the vibration pickups from overheating during operation.

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  • 25. 

    A typical jet engine 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 EGT indicating system contains thermocouples, leads, an indicator, and a resistor. The resistor is included in the system to provide a reference temperature for the indicator. It helps in calibrating the system and ensuring accurate temperature readings. The thermocouples measure the exhaust gas temperature, the leads transmit the temperature signals to the indicator, and the indicator displays the temperature readings. The turbine inlet, control valve, and exhaust duct are not directly related to the EGT indicating system and are not necessary components for its functioning.

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  • 26. 

    What should you do with the engine model and serial number when making general entries on the test cell engine log sheet?

    • Type these items.

    • Check past records.

    • Enter these only after the 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 eliminates any potential errors or discrepancies. By checking the numbers on the engine data plate, you can be confident that the log sheet accurately reflects the engine being tested.

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  • 27. 

    Observing oil on the turbine wheel or oil smoke at or near the turbine section during a test cell run is a good indication of

    • A damaged aft bearing oil seal.

    • An underserviced oil system.

    • Leaking external oil lines.

    • A loose aft roller bearing.

    Correct Answer
    A. A damaged aft bearing oil seal.
    Explanation
    Observing oil on the turbine wheel or oil smoke at or near the turbine section during a test cell run indicates a damaged aft bearing oil seal. This is because a damaged seal would allow oil to leak into the turbine section, leading to the presence of oil on the turbine wheel or oil smoke. The other options, such as underserviced oil system, leaking external oil lines, or a loose aft roller bearing, do not directly explain the presence of oil on the turbine wheel or oil smoke.

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  • 28. 

    During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine’s RPM reaches

    • 75 percent.

    • 80 percent.

    • 95 percent.

    • 100 percent.

    Correct Answer
    A. 95 percent.
    Explanation
    During a normal start on a GTCP 165 engine, the igniter plug continues firing until the engine's RPM reaches 95 percent. This means that the igniter plug will stop firing once the engine's RPM reaches this threshold. It is important for the engine to reach this RPM level to ensure proper functioning and stability before the igniter plug is turned off.

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  • 29. 

    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 the physical condition of the aircraft should be checked, but also any necessary paperwork or documentation related to the aircraft should be reviewed. This ensures that all necessary inspections and maintenance procedures have been completed and documented correctly before the aircraft is moved into the hush house.

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  • 30. 

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

    • A restricted air inlet.

    • Rapid throttle movement.

    • A restricted turbine nozzle.

    • A malfunctioning variable geometry system.

    Correct Answer
    A. Rapid throttle movement.
    Explanation
    Rapid throttle movement can lead to a compressor stall during emergency system operation. When the throttle is moved quickly, it can disrupt the airflow within the compressor, causing a disruption in the compression process and leading to a stall. This can happen because the compressor is not able to handle the sudden change in airflow and pressure. Therefore, it is important to operate the throttle carefully and smoothly during emergency situations to prevent compressor stalls.

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  • 31. 

    Most jet-powered aircraft engine fuel-flow indicating systems contain a fuel-flow

    • Transmitter and a float valve.

    • Control valve and a float valve.

    • Transmitter and a fuel-flow indicator.

    • Control valve and a fuel-flow transcriber.

    Correct Answer
    A. Transmitter and a fuel-flow indicator.
    Explanation
    Most jet-powered aircraft engine fuel-flow indicating systems contain a fuel-flow transmitter and a fuel-flow indicator. The fuel-flow transmitter measures the rate at which fuel is flowing through the engine, while the fuel-flow indicator displays this information to the pilot. This allows the pilot to monitor the fuel consumption of the aircraft and make necessary adjustments to ensure efficient operation. The float valve and control valve options are not correct because they do not accurately describe the components typically found in a fuel-flow indicating system.

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  • 32. 

    The tachometer generator’s frequency is proportional to the

    • Engine speed.

    • Transformer speed.

    • Speed of the electrical magnet.

    • Speed of the alternating magnet.

    Correct Answer
    A. Engine speed.
    Explanation
    The tachometer generator is a device that measures the rotational speed of an engine. It generates an electrical signal whose frequency is directly proportional to the engine speed. This means that as the engine speed increases, the frequency of the signal generated by the tachometer generator also increases. Therefore, the correct answer is engine speed.

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  • 33. 

    The tachometer indicating system’s two primary units 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, while the tachometer indicator displays this information to the operator. The other options mentioned, such as fuse panel, transformer, and thermocouple, are not directly related to the tachometer indicating system and therefore are not the correct answer.

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  • 34. 

    The term Pt2 means the

    • Total (t) pressure (P) at flange 2 (2).

    • Total (t) pressure (P) at station 2 (2).

    • Temperature (t) and pressure (P) at flange 2 (2).

    • Temperature (t) and pressure (P) at station 2 (2).

    Correct Answer
    A. Total (t) pressure (P) at station 2 (2).
    Explanation
    The term Pt2 refers to the total pressure (P) at station 2 (2).

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  • 35. 

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

    • Inlet side of the oil pump and the vent system.

    • Output side of the main oil pump and the vent system.

    • Scavenge pump and the inlet side of oil pressure pump.

    • Bearing jets and the output side of the oil scavenge pump.

    Correct Answer
    A. Output side of the main oil pump and the vent system.
    Explanation
    The correct answer is the output side of the main oil pump and the vent system. This is because pressure gauges are used to measure the pressure of the oil system, and connecting them at the output side of the main oil pump allows for accurate measurement of the pressure being generated by the pump. Additionally, connecting the gauges at the vent system provides information about the pressure in the system after it has been used, allowing for monitoring and troubleshooting of any potential issues.

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  • 36. 

    What two types of test cells does the Air Force currently use?

    • 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 specifically for testing purposes and are usually located at a specific facility. Portable test cells, on the other hand, are designed to be easily transported and set up in different locations as needed. These two types of test cells provide flexibility and convenience for conducting various tests and evaluations in different environments.

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  • 37. 

    Turbine blade fatigue failure does not result from

    • Nicks.

    • Dents.

    • Blends.

    • Scratches.

    Correct Answer
    A. Blends.
    Explanation
    Turbine blade fatigue failure is caused by the repeated stress and strain on the blade, which can lead to cracks and ultimately failure. Nicks, dents, and scratches can all create stress concentrations on the blade, making it more susceptible to fatigue failure. However, blends, which refer to the smooth transition between different surfaces on the blade, do not create stress concentrations and therefore do not contribute to fatigue failure.

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  • 38. 

    What circuit trips to stop the engine during normal GTCP 165 engine shutdown?

    • 100-percent circuit.

    • 110-percent circuit.

    • Load-control circuit.

    • Speed-switch control circuit.

    Correct Answer
    A. 110-percent circuit.
    Explanation
    The 110-percent circuit is responsible for tripping and stopping the engine during normal GTCP 165 engine shutdown. This circuit is designed to monitor the engine's speed and ensure that it does not exceed 110 percent of the rated speed. If the engine speed goes above this threshold during shutdown, the circuit will trip and shut down the engine to prevent any damage or unsafe conditions.

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  • 39. 

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

    • For training practice.

    • In aircraft that have been modified.

    • That have been involved in an incident or a mishap.

    • That have severe FOD damage.

    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 order to assess their condition and ensure that they are functioning properly. This is important because any damage or issues with the engine could have contributed to the incident or mishap, and it is essential to identify and address these problems to prevent future accidents. Testing these engines allows for a thorough evaluation of their performance and helps in determining if any repairs or modifications are necessary.

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  • 40. 

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

    • Pounds per hour.

    • Gallons per hour.

    • Pounds per minute.

    • Gallons per minute.

    Correct Answer
    A. Pounds per hour.
    Explanation
    The fuel-flow indicator measures the rate at which fuel is flowing, and it does so in terms of pounds per hour. This measurement is commonly used in aviation to determine the fuel consumption of an aircraft and to calculate various performance parameters. By displaying the fuel flow in pounds per hour, pilots can accurately monitor their fuel usage and make informed decisions regarding fuel management during flight.

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  • 41. 

    The swivel pads at the bottom of the leveling jacks on the engine thrust trailer of the portable test cell provide all of the following except

    • Leveling the engine being tested.

    • Removing the wheel and tire assemblies.

    • Supporting the thrust trailer at a height of 80 inches.

    • Adjusting for rail compatibility with engine transportation trailers.

    Correct Answer
    A. Supporting the thrust trailer at a height of 80 inches.
    Explanation
    The swivel pads at the bottom of the leveling jacks on the engine thrust trailer of the portable test cell provide leveling the engine being tested, removing the wheel and tire assemblies, and adjusting 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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  • 42. 

    Which of these inspections is a flight preparedness check?

    • Periodic.

    • Preflight.

    • Thruflight.

    • End-of-runway.

    Correct Answer
    A. Preflight.
    Explanation
    The correct answer is Preflight. A preflight inspection is conducted before each flight to ensure that the aircraft is in a safe and airworthy condition. It involves checking various components, systems, and documentation to ensure that everything is functioning properly and meets the required standards. This inspection is crucial for flight preparedness as it helps identify any potential issues or discrepancies that may affect the safety and performance of the aircraft during the flight.

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  • 43. 

    Understanding the operating principles of engine instruments help you decide

    • If an engine should be removed from an aircraft.

    • If the engine should be sent to the test cell.

    • The meaning of the instrument readings.

    • What tools are required for maintenance.

    Correct Answer
    A. The meaning of the instrument readings.
    Explanation
    Understanding the operating principles of engine instruments is important because it enables you to interpret the readings displayed by these instruments. By knowing the meaning of the instrument readings, you can assess the performance and condition of the engine. This knowledge helps you make informed decisions about whether the engine should be removed from the aircraft for further inspection or maintenance, or if it can be sent to the test cell for further testing. It also allows you to identify any potential issues or abnormalities with the engine, which can aid in troubleshooting and determining the appropriate course of action.

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  • 44. 

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

    • One gold contact.

    • Two silver contacts.

    • Three bronze contacts.

    • Four copper contacts.

    Correct Answer
    A. Two silver contacts.
    Explanation
    The correct answer is two silver contacts. This type of overheat detector unit used on aircraft engines consists of a hollow stainless-steel tube that covers two silver contacts. These contacts are designed to detect excessive heat and trigger an alarm or warning system if the temperature exceeds a certain threshold. The use of silver contacts ensures good conductivity and reliability in detecting overheating conditions in the engine.

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  • 45. 

    The modulating and shutoff valve on a GTCP 165 engine will be fully open at what percent RPM?

    • 60.

    • 70.

    • 80.

    • 90.

    Correct Answer
    A. 90.
    Explanation
    The modulating and shutoff valve on a GTCP 165 engine will be fully open at 90% RPM. This means that when the engine is running at 90% of its maximum speed, the valve will be fully open, allowing maximum airflow and fuel flow into the engine. At lower RPMs, the valve may be partially closed to restrict the flow and control the engine's performance.

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  • 46. 

    Where should you begin troubleshooting after reviewing the aircraft/engine forms?

    • Discuss problem with other journeymen in the shop.

    • Check each part of every system.

    • Examine most complex unit.

    • Observe gauge indications.

    Correct Answer
    A. Observe gauge indications.
    Explanation
    After reviewing the aircraft/engine forms, the next step in troubleshooting should be to observe gauge indications. This is because gauge indications can provide valuable information about the performance and condition of various systems in the aircraft or engine. By carefully observing the gauge indications, any abnormal readings or fluctuations can be identified, which can then help in narrowing down the potential issues and determining the appropriate course of action for troubleshooting.

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  • 47. 

    What F100-PW–220 engine monitoring system component acquires fault data from the DEEC and logs the faults with the time of their occurrence?

    • DCU.

    • GSU

    • EAU.

    • EDU.

    Correct Answer
    A. EDU.
    Explanation
    The EDU (Engine Data Unit) is the component of the F100-PW-220 engine monitoring system that acquires fault data from the DEEC (Digital Electronic Engine Control) and logs the faults with the time of their occurrence.

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  • 48. 

    Which test cell noise suppressors use water to cool the exhaust gases?

    • None.

    • Fixed.

    • Portable.

    • Both fixed and portable.

    Correct Answer
    A. Both fixed and portable.
    Explanation
    Both fixed and portable test cell noise suppressors use water to cool the exhaust gases. This means that regardless of whether the noise suppressor is permanently installed in a fixed location or can be moved around, they both utilize water as a cooling mechanism for the exhaust gases.

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  • 49. 

    Before installing an engine on the test cell thrust stand, make sure the

    • Engine is 99 percent complete.

    • Rail adapters are properly lubricated.

    • Engine manager has scheduled the engine run.

    • Engine rail adapters and stand are compatible.

    Correct Answer
    A. Engine rail adapters and stand are compatible.
    Explanation
    Before installing an engine on the test cell thrust stand, it is important to ensure that the engine rail adapters and stand are compatible. This means that the adapters should be designed to fit securely onto the stand, allowing for proper alignment and stability during the engine run. Using incompatible adapters and stand can lead to safety hazards and inaccurate test results. Therefore, it is crucial to check the compatibility of the adapters and stand before proceeding with the installation.

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Quiz Review Timeline (Updated): Jul 22, 2024 +

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

  • Current Version
  • Jul 22, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 02, 2016
    Quiz Created by
    JamalMayfield
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