5 Level Volume 4

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1. (615) You can get information such as temperature and barometric pressure from equipment at the test cell site or from

Explanation

The control tower is the correct answer because it is responsible for monitoring and controlling all air traffic in the vicinity of the test cell site. As part of their duties, control tower personnel have access to real-time weather information, including temperature and barometric pressure, which they can provide to individuals at the test cell site. Therefore, if someone at the test cell site needs information about the weather conditions, they should contact the control tower.

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About This Quiz
5 Level Volume 4 - Quiz

This quiz, titled '5 Level Volume 4', assesses knowledge in aircraft maintenance, focusing on troubleshooting practices and engine monitoring systems.

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2. (603) The oil pressure indicator receives an electrical signal from the

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, oil pressure) into an electrical signal. In the context of an oil pressure indicator, the transmitter is responsible for measuring the oil pressure and sending the corresponding electrical signal to the indicator. This allows the indicator to display the accurate oil pressure reading to the operator.

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3. (614) Which of these is not considered a cause of FOD?

Explanation

The ingestion of bolts, rocks, and the formation of ice are all considered causes of Foreign Object Debris (FOD), which refers to any object or substance that is foreign to an aircraft or its systems and has the potential to cause damage. However, failure of internal parts is not typically considered a cause of FOD. FOD is usually the result of external objects or substances entering the aircraft, rather than internal components failing and causing debris.

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4. 615) The steps in removing the engine and test equipment from the test cell are

Explanation

The correct answer is "the reverse of the installation sequence." This means that when removing the engine and test equipment from the test cell, the steps should be done in the opposite order of how they were installed. This is likely because the installation sequence would involve specific steps to ensure proper placement and connection, and reversing these steps would ensure the safe and efficient removal of the equipment.

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5.   (618) What inspection is given to all newly assigned aircraft?

Explanation

The inspection given to all newly assigned aircraft is called the acceptance inspection. This inspection is conducted to ensure that the aircraft meets all the necessary requirements and standards before it is put into service. It involves a thorough examination of the aircraft's systems, components, and documentation to verify its airworthiness and readiness for operation. The acceptance inspection is an important step in the process of introducing a new aircraft into an organization's fleet.

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6. (614) When an engine arrives for a test run at the test cell, it must

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 known issues or problems with the engine must be fixed before it can be tested. This ensures that the engine is in proper working condition and will provide accurate results during the test run. It also helps to prevent any further damage or issues that could arise from running a faulty engine.

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7. (614) 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

Explanation

The correct answer is to eliminate items that could possibly cause FOD. FOD stands for Foreign Object Debris, which refers to any object or material that is not part of an aircraft or engine and has the potential to cause damage. Checking for loose nuts, bolts, lock wire, tools, or any other material before an engine test run helps to ensure that no foreign objects are present that could potentially cause FOD. This is important for the safety and proper functioning of the engine.

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

Explanation

When making general entries on the test cell engine log sheet, it is important to verify the engine model and serial number on the engine data plate. This ensures that the correct information is recorded and avoids any potential errors or discrepancies. Checking past records and entering these numbers only after the test is complete may be relevant for other purposes, but when it comes to making general entries on the log sheet, the focus should be on verifying the numbers on the engine data plate.

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9. (615) Before installing an engine on the test cell thrust stand, make sure the

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 rail adapters should fit securely and properly on the stand, allowing for a stable and safe installation. If the rail adapters and stand are not compatible, there is a risk of instability or damage during the engine run, which could be dangerous. Therefore, it is crucial to check the compatibility of the rail adapters and stand before proceeding with the installation.

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10.   (603) Which metals are used in the EGT indicating system thermocouples?

Explanation

Alumel and chromel are the metals used in the EGT (Exhaust Gas Temperature) indicating system thermocouples. These metals are chosen for their high temperature resistance and stability. Alumel is an alloy of nickel, aluminum, manganese, and silicon, while chromel is an alloy of nickel and chromium. These alloys are able to withstand the high temperatures generated in the exhaust system and provide accurate temperature readings for monitoring and control purposes.

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11.   (618) Which of these inspections is a flight preparedness check?

Explanation

The correct answer is "Preflight." A preflight inspection is conducted before every flight to ensure that the aircraft is in proper working condition and ready for flight. This inspection includes a thorough check of the aircraft's systems, controls, and exterior surfaces to identify any potential issues or hazards that could affect the safety of the flight. It is an essential step in ensuring that the aircraft is prepared for takeoff and that all necessary precautions have been taken.

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12. (613) What two types of test cells does the Air Force currently use?

Explanation

The Air Force currently uses two types of test cells: fixed and portable. Fixed test cells are permanent installations that are typically located at air bases or testing facilities. They are designed to conduct various tests on aircraft engines and other equipment. Portable test cells, on the other hand, are temporary setups that can be easily transported and set up in different locations. They are used for field testing or when a fixed test cell is not available.

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13.   (622) The pneumatic air bled from the small gas turbine engine cannot be used to

Explanation

The pneumatic air bled from the small gas turbine engine cannot be used to inflate aircraft tires because the air bled from the engine is not suitable for inflating tires. It may contain impurities or have specific properties that make it unsuitable for this purpose. Therefore, alternative methods or sources of air must be used to inflate aircraft tires.

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14. (603) 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. It provides information on the amount of fuel consumed over a specific period of time. The most commonly used unit for measuring fuel flow is pounds per hour (lb/hr). This unit is preferred because it allows for accurate calculations of fuel consumption and helps in determining the aircraft's range and endurance.

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15. (605) What engine vibration does not persist, but comes and goes?

Explanation

Transient engine vibration refers to vibrations that occur intermittently or temporarily and do not persist. These vibrations may come and go and are typically caused by temporary disturbances or changes in operating conditions. Unlike resonance or externally excited vibrations, which can persist and are caused by specific frequencies or external forces, transient vibrations are temporary in nature and do not have a consistent pattern or duration. Therefore, the correct answer is transient.

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16. (606) Which type of vibration transducer is made of certain ceramic compounds and natural crystals?

Explanation

A piezoelectric accelerometer is made of certain ceramic compounds and natural crystals. These materials have the property of generating an electrical charge when subjected to mechanical stress or vibration. This type of transducer is commonly used for measuring vibrations in various applications, such as structural health monitoring, machinery condition monitoring, and automotive testing. It converts the mechanical vibrations into an electrical signal, allowing for accurate measurement and analysis of the vibration levels.

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17.   (601) 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. It enables them to determine which specific component or unit is causing the issue and take appropriate steps to fix it. Understanding the function of each unit within each system also helps troubleshooters to anticipate potential problems and develop effective troubleshooting strategies. This level of expertise comes from studying and gaining in-depth knowledge about the various units and systems involved in the troubleshooting process.

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18.   (602) Which F100-PW–220 engine monitoring system component transfers information from the EDU to the GSU?

Explanation

The F100-PW-220 engine monitoring system component that transfers information from the EDU to the GSU is the DCU.

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

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 stopping the flow of fuel to the engine, preventing any further combustion and shutting down the engine completely.

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20.   (603) A typical jet engine EGT indicating system contains thermocouples, leads, an indicator, and

Explanation

A typical jet engine EGT indicating system contains thermocouples, leads, an indicator, and a resistor. The resistor is an essential component of the system as it helps to regulate the electrical current and temperature readings. It plays a crucial role in converting the temperature measurements from the thermocouples into electrical signals that can be displayed on the indicator. Without the resistor, the system would not be able to accurately measure and display the engine's exhaust gas temperature.

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21.   (603) Most jet-powered aircraft engine fuel-flow indicating systems contain a fuel-flow

Explanation

Jet-powered aircraft engine fuel-flow indicating systems typically consist of a fuel-flow transmitter and a fuel-flow indicator. The transmitter measures the rate of fuel flow and sends this information to the indicator, which displays it to the pilot. This allows the pilot to monitor the fuel consumption and ensure that the engine is receiving the appropriate amount of fuel. The other options, control valve and a float valve, and control valve and a fuel-flow transcriber, are not commonly found in fuel-flow indicating systems.

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22. (620) What causes over-temperature damage to the combustion chamber from a stall condition?

Explanation

When an aircraft experiences a stall condition, there is a disruption in the smooth airflow over the wings, resulting in a loss of lift. This can cause a decrease in engine power, leading to a reduction in the cooling airflow to the combustion chamber. Without sufficient cooling, the temperature in the combustion chamber can rise to dangerous levels, causing over-temperature damage. Therefore, an interruption of cooling airflow is the most likely cause of over-temperature damage to the combustion chamber from a stall condition.

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

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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24. (613) 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

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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25.   (603) To be considered effective tools for aviators, aircraft instruments must be light weight, easy to read, and

Explanation

Aircraft instruments need to be small in size in order to be considered effective tools for aviators. This is because there is limited space inside an aircraft cockpit, and having large instruments would take up too much space and make it difficult for pilots to operate the aircraft. Additionally, small instruments are also lighter in weight, which is another important factor for aircraft instruments to ensure that the overall weight of the aircraft is kept to a minimum.

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26.   (622) When used for ground operation, the SGT engine can be installed on

Explanation

The correct answer is a four-wheel trailer. This means that the SGT engine, when used for ground operation, can be installed on a four-wheel trailer.

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27. (606) When using a vibration analyzer how are you notified when a preset signal has been exceeded?

Explanation

When using a vibration analyzer, a preset signal being exceeded is notified through a flashing channel indicator LED. This means that when the vibration levels surpass the predetermined threshold, the specific channel on the analyzer will display a flashing LED light, indicating that the signal has been exceeded. This visual notification allows the user to quickly identify and address any potential issues or anomalies in the vibration levels being analyzed.

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28. (615) 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

Explanation

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. This is because a damaged seal would allow oil to leak out and come into contact with the turbine wheel, causing oil to be present in that area. This can result in oil smoke being visible during the test run. The other options, underserviced oil system, leaking external oil lines, and a loose aft roller bearing, do not directly explain the presence of oil on the turbine wheel or oil smoke, making them less likely explanations.

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29. (612) Which testing engine is equipped with a QEC kit?

Explanation

The TF39-1C testing engine is equipped with a QEC (Quick Engine Change) kit.

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30. (619) Careless operation of the throttle during emergency system operation could cause a compressor stall due to

Explanation

Rapid throttle movement can cause a compressor stall during emergency system operation. This is because sudden changes in throttle position can disrupt the airflow through the engine, leading to an imbalance between the amount of air entering the compressor and the amount of fuel being injected. This can result in a disruption of the combustion process and cause the compressor to stall.

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31.   (601) Which of the following is not a proper troubleshooting practice?

Explanation

Inspecting other areas after isolating trouble between points is not a proper troubleshooting practice because it can lead to wasted time and effort. Once trouble has been isolated between specific points, it is more efficient to focus on those points and perform targeted inspections and checks to identify the root cause of the problem. Inspecting other areas that are not directly related to the isolated trouble points can be a distraction and may not provide any relevant information to resolve the issue. It is important to follow a systematic troubleshooting process to save time and resources.

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32. (613) The basic portable test cell's thrust trailer rails adjust to a height of

Explanation

The correct answer is 40 inches. The basic portable test cell's thrust trailer rails can be adjusted to a height of 40 inches.

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33.   (603) Most engine-monitoring gauges and instruments require some type of

Explanation

Most engine-monitoring gauges and instruments require a transmitter and indicator because the transmitter is responsible for converting the physical measurements 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. Therefore, both the transmitter and indicator are necessary components for the proper functioning of engine-monitoring gauges and instruments.

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34. (607) What supports the fan and low-pressure turbine?

Explanation

Bearings are the components that support the fan and low-pressure turbine. They are designed to reduce friction and allow smooth rotation of these components. Bearings are typically made of durable materials such as steel or ceramic and are lubricated to ensure proper functioning. They provide stability and support to the fan and low-pressure turbine, allowing them to operate efficiently and effectively.

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35. (612) In addition to determining the condition of a repaired or overhauled engine, you also test engines

Explanation

The correct answer is "that have been involved in an incident or a mishap." This is because testing engines that have been involved in an incident or a mishap helps to determine the extent of damage and evaluate the engine's performance after such events. This is important for safety reasons and to ensure that the engine is functioning properly before it is used again.

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36. (623) Air for the load control system on a GTCP 165 engine is extracted from the

Explanation

The correct answer is turbine plenum. In a GTCP 165 engine, air for the load control system is extracted from the turbine plenum. The turbine plenum is a chamber located between the turbine and the combustor. It is responsible for collecting and distributing air to various components of the engine, including the load control system. Extracting air from the turbine plenum ensures that the load control system receives a sufficient and controlled amount of air for its operation.

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37. (603) One type of overheat detector unit used on aircraft engines consists of a hollow stainless-steel tube that covers

Explanation

The correct answer is two silver contacts. The overheat detector unit used on aircraft engines consists of a hollow stainless-steel tube that covers two silver contacts. This design allows for the detection of excessive heat in the engine by measuring the resistance between the contacts. When the temperature rises, the contacts expand and the resistance decreases, triggering an alarm or warning system. Silver is a good conductor of heat and electricity, making it suitable for this purpose.

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38. (603) For an operational check of the fire warning system, you press

Explanation

The correct answer is only the TEST switch. This is because when performing an operational check of the fire warning system, pressing only the TEST switch is sufficient. Pressing both the TEST and NORMAL switches or only the TEST WARNING ON switch would not be necessary for this specific check. Pressing both the TEST ON and TEST OFF switches would also not be required as they are not relevant to the operational check of the fire warning system.

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39.   (618) A BPO is done

Explanation

The correct answer is "after the last flight of the flying period." This means that the BPO (Base Pre-operation) is conducted after the final flight of the day. It is done to ensure that all necessary inspections and checks are completed before the aircraft is parked and secured for the night. Conducting the BPO after the last flight helps to ensure that any issues or discrepancies can be addressed and resolved before the aircraft is taken out of service.

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40.   (601) Where should you begin troubleshooting after reviewing the aircraft/engine forms?

Explanation

After reviewing the aircraft/engine forms, the best place to begin troubleshooting is by observing gauge indications. This is because gauge indications can provide valuable information about the performance of various systems and components. By carefully monitoring the gauge readings, any abnormal or out-of-spec indications can be identified, which can then help in narrowing down the potential issues and determining the appropriate troubleshooting steps. Checking each part of every system or examining the most complex unit may be time-consuming and inefficient, while discussing the problem with other journeymen in the shop may not provide immediate and accurate information. Therefore, observing gauge indications is the most logical and effective starting point for troubleshooting.

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41. (604) The display range of the test cell IC temperature indicator is

Explanation

The correct answer is –50 to +1,600 °F. This means that the test cell IC temperature indicator can display temperatures ranging from -50 degrees Fahrenheit to +1,600 degrees Fahrenheit.

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42. (616) What information is used as an aid in test facility inspections?

Explanation

Periodic inspection checklists are used as an aid in test facility inspections. These checklists provide a systematic and comprehensive guide for inspecting the test facility, ensuring that all necessary areas and components are examined. They help inspectors ensure that the facility meets the required standards and regulations, identify any potential issues or deficiencies, and document the findings. By using periodic inspection checklists, inspectors can effectively assess the condition and safety of the test facility and take appropriate actions if needed.

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43. (611) When inspecting the hush house, you are not required to check the

Explanation

When inspecting the hush house, the focus is on checking various aspects related to the engine testing process. This includes inspecting the concrete deterioration, ensuring the functionality of the fire suppression system, and examining the engine tie-down assemblies. However, the engine being tested itself does not need to be checked as it is the primary object of the testing process rather than a component of the hush house infrastructure.

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44. (623) During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine's RPM reaches

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 remain active and continue to provide a spark to ignite the fuel-air mixture until the engine's RPM reaches this level. Once the RPM reaches 95 percent, the igniter plug can be deactivated as the engine is now running smoothly and does not require additional ignition assistance.

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45. (603) The term Pt2 means the

Explanation

The term Pt2 refers to the total pressure (P) at station 2 (2). This means that it represents the combined pressure exerted by all the gases and fluids present at station 2. It does not include temperature information or specify a particular flange.

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46.   (622) What controls turbine discharge temperature on a GTCP 165 engine?

Explanation

The pneumatic thermostat controls the turbine discharge temperature on a GTCP 165 engine. It regulates the flow of air to the turbine to maintain the desired temperature. This ensures that the engine operates within the specified temperature range, preventing overheating or damage to the turbine components. The other options, PMG, fuel flow divider valve, and governor, are not directly responsible for controlling the turbine discharge temperature.

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47.   (618) Which inspection is a combination of the BPO/hourly post-flight and periodic inspection (PE) requirements?

Explanation

A phased inspection is a combination of the BPO/hourly post-flight and periodic inspection requirements. This type of inspection involves both a detailed examination of specific components and systems after each flight, as well as a more comprehensive inspection that is conducted periodically. It allows for a thorough assessment of the aircraft's condition and ensures that all necessary maintenance tasks are performed.

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48.   (603) Which jet engine temperature is not measured?

Explanation

The question asks which jet engine temperature is not measured. The correct answer is "Combustion inlet." This means that the temperature of the air entering the combustion chamber of a jet engine is not typically measured. Temperature measurements are commonly taken at the fan turbine inlet, turbine inlet, and exhaust gas, but not at the combustion inlet.

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49.   (609) When doing an anti-ice valve operational check on an F-16C/D before starting the engine you place the anti-ice engine switch to

Explanation

When doing an anti-ice valve operational check on an F-16C/D before starting the engine, the correct position for the anti-ice engine switch is OFF. This is because during the operational check, the anti-ice valve should be closed to ensure that there is no leakage in the system. By placing the switch in the OFF position, it confirms that the valve is closed and there is no anti-ice system leakage.

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50.   (603) Understanding the operating principles of engine instruments help you decide

Explanation

Understanding the operating principles of engine instruments helps you interpret the readings they provide. By knowing the meaning of the instrument readings, you can determine the current state of the engine and whether any maintenance or further action is required. This knowledge allows you to make informed decisions regarding the engine, such as whether it needs to be removed from the aircraft or sent to the test cell for further evaluation.

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51. (613) The portable test cell's vibration pickups are cooled by the

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.

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52.   (608) You can find written instructions for safe flight-line vehicle operations in

Explanation

The correct answer is AFOSH STD 91-100. AFOSH STD 91-100 provides written instructions for safe flight-line vehicle operations. AFI 36-2903 pertains to dress and appearance standards, while the intermediate maintenance TO would provide instructions for maintenance procedures. Therefore, AFOSH STD 91-100 is the most appropriate source for safe flight-line vehicle operations.

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53. (613) Which test cell noise suppressors use water to cool the exhaust gases?

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 or can be moved around, water is still used as a cooling mechanism for the exhaust gases.

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54. (615) When preparing to install the miscellaneous kit prior to a test cell run, you inspect all indicators and controls for

Explanation

When preparing to install the miscellaneous kit prior to a test cell run, it is important to inspect all indicators and controls for possible damage. This is necessary to ensure that the equipment is in proper working condition and that there are no visible signs of damage that could affect its performance during the test cell run. By inspecting for possible damage, any issues can be identified and addressed before proceeding with the installation, reducing the risk of equipment failure or malfunction during the test.

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55. (611) The sidewalls of the hush house test bay is constructed of

Explanation

The correct answer is air inlet modules. The sidewalls of the hush house test bay are constructed of air inlet modules, which allow for the controlled intake of air into the test bay. These modules are designed to regulate the airflow and provide the necessary ventilation for the test bay. The use of air inlet modules ensures that the air entering the test bay is properly filtered and controlled, maintaining the desired testing environment.

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56. (623) The modulating and shutoff valve on a GTCP 165 engine will be fully open at what percent RPM?

Explanation

The modulating and shutoff valve on a GTCP 165 engine will be fully open at 90 percent RPM.

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57. (620) What condition describes turbine nozzles that are burned out uniformly around the whole annulus from an over-temperature condition?

Explanation

This answer is correct because it accurately describes the condition of turbine nozzles that are burned out uniformly around the whole annulus from an over-temperature condition. In a severe stall condition, there is a disruption in the cooling airflow, which leads to the overheating and burning out of the turbine nozzles. This is different from a mild stall condition where the cooling airflow is normal and does not result in the same level of damage.

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58. (621) Galling of bearing rolling elements and races is characterized by

Explanation

Galling of bearing rolling elements and races refers to a condition where there is a transfer of metal between the rolling elements and races. This transfer occurs due to excessive friction and can lead to damage and wear of the bearing components. Flaking of metal may occur as a result of this transfer. Magnetization and discoloration are not characteristic of galling, making them incorrect options.

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59. (603) The tachometer indicating system's two primary units are the tachometer generator and

Explanation

The tachometer indicating system consists of two primary units: the tachometer generator and the indicator. The tachometer generator is responsible for measuring the speed of rotation and converting it into an electrical signal. This signal is then sent to the indicator, which displays the speed of rotation on a dial or digital display. Therefore, the correct answer is the indicator.

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60. (603) The tachometer generator's frequency is proportional to the

Explanation

The tachometer generator is a device that measures the speed of an engine. It works by converting the rotational speed of the engine into an electrical signal. The frequency of this signal is directly proportional to the engine speed. Therefore, the correct answer is engine speed.

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61.   (622) The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by

Explanation

The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by couplings on a common shaft. This means that the three wheels are linked together by a shaft with couplings, allowing them to rotate together and transfer power between them. This arrangement allows for efficient and synchronized operation of the turbine section, ensuring smooth and effective functioning of the engine.

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62. (611) What hush house feature allows flexibility when running an engine that has been removed from the airframe?

Explanation

The thrust stand sliding into position allows flexibility when running an engine that has been removed from the airframe. This feature enables the engine to be securely positioned and stabilized, allowing it to be safely operated while not attached to the aircraft.

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63. (613) In a fixed test cell, the test bay access doors are sealed to

Explanation

The test bay access doors are sealed in order to prevent unwanted noise from entering the control room. This is important because excessive noise can disrupt the test process and make it difficult for technicians to accurately monitor and control the test. By sealing the doors, the test bay can be kept as quiet as possible, creating a more controlled and accurate testing environment.

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64. (620) Turbine blade fatigue failure does not result from

Explanation

Turbine blade fatigue failure occurs due to repeated stress cycles, which can lead to cracks and ultimately failure. Nicks, dents, and scratches are physical damages that can weaken the blade and serve as stress concentration points, increasing the likelihood of fatigue failure. However, blends refer to the smooth transition between different sections of the blade, which do not typically contribute to fatigue failure. Therefore, turbine blade fatigue failure does not result from blends.

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65. (603) How is inlet Pt2 transmitted from its sensing point?

Explanation

The correct answer is "Through tubing." This means that inlet Pt2 is transmitted from its sensing point using tubing. This suggests that there is a physical connection, likely a tube or pipe, through which the pressure or measurement is transmitted to the desired location.

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66.   (601) The troubleshooting information contained in aircraft power plant and engine intermediate maintenance TO is presented in the form of

Explanation

The correct answer is troubleshooting charts. The troubleshooting information in aircraft power plant and engine intermediate maintenance TO is presented in the form of charts that help identify and resolve issues with the power plant and engine systems. These charts provide step-by-step instructions and diagrams to guide maintenance personnel in diagnosing and fixing problems.

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67. (615) Where would you begin your investigation of an engine with a possible oil consumption problem?

Explanation

To investigate an engine with a possible oil consumption problem, reviewing AFTO Form 781H would be the appropriate starting point. AFTO Form 781H is an engine oil consumption record that provides detailed information about the engine's oil consumption history. By reviewing this form, one can gather valuable data regarding the engine's oil consumption patterns, previous maintenance actions, and any reported issues. This information can help identify potential causes of the oil consumption problem and guide further investigation or troubleshooting steps.

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68. (614) Improperly rigged throttle linkage during a test cell run can cause

Explanation

Improperly rigged throttle linkage during a test cell run can cause engine overspeed. When the throttle linkage is not properly rigged, it can result in the throttle being opened more than intended, causing the engine to run at a higher speed than it is designed for. This can lead to excessive wear and tear on the engine components, potentially causing damage and compromising its performance and safety.

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69. 607) What procedure ensures that the fan and low-pressure turbine are correctly balanced?

Explanation

Fan rotor trim balance is the procedure that ensures that the fan and low-pressure turbine are correctly balanced. This involves adjusting the weight distribution of the fan rotor blades to minimize any vibrations or uneven forces during operation. By achieving a proper balance, the fan and low-pressure turbine can operate smoothly and efficiently, reducing the risk of damage and improving overall performance.

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70. (603) What converts the exhaust nozzle's position on engines with afterburners into an electrical signal?

Explanation

A transducer is a device that converts one form of energy into another. In the case of engines with afterburners, the exhaust nozzle's position needs to be converted into an electrical signal. This is where a transducer comes in. It is responsible for converting the physical position of the exhaust nozzle into an electrical signal that can be used for various purposes, such as monitoring and control. A rheostat, rectifier, and transformer are not specifically designed for this task, making transducer the correct answer.

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71.   (617) Which of the following is not an inspection phase?

Explanation

The given question asks for the inspection phase that is not included in the options provided. The options given are "Fix," "Look," "Preinspection," and "HSC." Out of these options, "HSC" is not a commonly known inspection phase, while "Fix," "Look," and "Preinspection" can all be considered as inspection phases. Therefore, "HSC" is the correct answer as it does not fit the criteria of being an inspection phase.

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72.   (610) Aircraft noise suppressors have how many primary air silencers to help reduce turbine whine?

Explanation

Aircraft noise suppressors have two primary air silencers to help reduce turbine whine. These silencers are designed to absorb and dampen the noise produced by the aircraft's turbines, reducing the overall noise level. By using two silencers, the aircraft can effectively suppress the noise and make the flying experience more comfortable for passengers and reduce noise pollution in surrounding areas.

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73. (611) 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 for any red streamers. This implies that red streamers are used as indicators for potential issues or hazards that need to be addressed before the aircraft can be moved. Inspecting the aircraft for red streamers ensures that any necessary maintenance or repairs are completed before the aircraft is brought into the hush house.

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74. (611) 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 construction allows for flexibility and easy installation, as the small panel modules can be easily assembled and arranged to fit the specific requirements of the hush house. The noise reduction material helps to absorb and dampen the noise generated by the exhaust, ensuring that the hush house operates quietly and efficiently.

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75. (623) What circuit trips to stop the engine during normal GTCP 165 engine shutdown?

Explanation

The 110-percent circuit is the circuit that trips to stop the engine during normal GTCP 165 engine shutdown. This circuit is designed to monitor the engine's speed and when it reaches 110 percent of the normal operating speed, it triggers the shutdown process. This ensures that the engine is safely shut down and prevents any damage or malfunction that could occur if the engine were to continue running at high speeds. The 110-percent circuit acts as a safety measure to protect the engine and the surrounding equipment.

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76. (613) The vertical baffles in the fixed test cell's exhaust stack are designed to remove

Explanation

The vertical baffles in the fixed test cell's exhaust stack are designed to remove low-frequency sound. Baffles are used to control and reduce the intensity of sound waves by creating obstacles that reflect or absorb the sound energy. In this case, the baffles are specifically designed to target low-frequency sound waves, which have longer wavelengths and are typically harder to attenuate compared to high-frequency sound waves. By removing low-frequency sound, the baffles help to minimize noise pollution and create a quieter environment in and around the test cell.

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77. (613) The portable test cell is not equipped with a

Explanation

The portable test cell is not equipped with a model 3000 trailer.

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78. (606) Where do you find the instructions for installing vibration pickups at the test cell?

Explanation

The intermediate maintenance manual is the correct source for finding the instructions for installing vibration pickups at the test cell. This manual provides detailed information and step-by-step procedures for intermediate-level maintenance tasks, including the installation of equipment like vibration pickups. It is a comprehensive resource that technicians can refer to for guidance on maintenance procedures and troubleshooting. The other options, such as the test cell technical order, organizational maintenance manual, and methods and procedures maintenance manual, may contain relevant information but the intermediate maintenance manual is specifically designed for this level of maintenance task.

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79. (605) What engine vibration usually causes the most concern?

Explanation

Forced engine vibration usually causes the most concern because it is typically caused by external factors such as loose components, worn bearings, or misalignment. This type of vibration is often more severe and can indicate a more serious issue with the engine, requiring immediate attention to prevent further damage or failure. Transient vibration refers to temporary or intermittent vibrations that are not as worrisome, unbalanced vibration is caused by an uneven distribution of mass within the engine, and externally excited vibration is caused by external forces such as wind or turbulence.

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80. (619) A cold compressor stall occurring at low RPM accompanied by a slight over temperature is called

Explanation

A cold compressor stall occurring at low RPM accompanied by a slight over temperature is referred to as an incipient. This term is used to describe the early stage or beginning of a problem or condition. In this case, the cold compressor stall is still in its initial phase and has not fully developed or caused a severe over temperature.

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81. (604) The test cell's EGT selector allows selecting

Explanation

The test cell's EGT selector allows selecting individual thermocouple inputs or an average of these inputs. This means that the EGT parameter can be measured either from each individual thermocouple or from an average of all the thermocouples. This provides flexibility in monitoring and analyzing the EGT readings in the test cell.

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82. (613) The portable test cell's noise suppressor is not equipped with

Explanation

The portable test cell's noise suppressor is not equipped with a fuel trailer. This means that the noise suppressor does not have a fuel trailer attached to it. The presence of a fuel trailer is not necessary for the functioning of the noise suppressor in the test cell.

Submit
83. (604) When connected to an engine oil pressure line the direct oil pressure gauge on a test cell indicates oil pressure without using wiring, indicator, or

Explanation

The direct oil pressure gauge on a test cell indicates oil pressure without using wiring, indicator, or engine transformer. Since the gauge is connected to an engine oil pressure line, it must be connected to an aircraft transmitter to receive and display the oil pressure readings.

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84. (605) What type of vibration causes unnecessary engine removals and unwarranted repairs?

Explanation

Externally excited vibrations refer to vibrations that are caused by external factors such as wind, road conditions, or other mechanical components. These vibrations can lead to unnecessary engine removals and unwarranted repairs because they put additional stress on the engine and its components, potentially causing damage or malfunctions. Therefore, the correct answer is externally excited.

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85. (605) In vibration analysis, frequency is usually measured in

Explanation

In vibration analysis, frequency is a measure of how many cycles or oscillations occur per unit of time. It is usually measured in cycles per second, which is also known as Hertz (Hz). This unit of measurement is commonly used to quantify the frequency of vibrations in machinery and structures. Mils, phase lags, and phases per second are not typically used to measure frequency in vibration analysis.

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86. (612) When testing a TF34 engine at test cell, which test ensures that all operating limits and schedules from idle to maximum power are within limits?

Explanation

The transient check test ensures that all operating limits and schedules from idle to maximum power are within limits during the testing of a TF34 engine at a test cell. This test involves subjecting the engine to rapid changes in power settings and monitoring its performance to ensure that it can handle the transitions smoothly without exceeding any limits. This helps to verify the engine's ability to operate effectively and safely across its entire power range.

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87.   (609) When checking the turbine section, you do not measure

Explanation

When checking the turbine section, the measurement of IGT (Interstage Turbine Temperature) is not necessary. This is because IGT refers to the temperature between two stages of the turbine, and it is not typically measured during routine inspections. Instead, other temperature measurements such as FTIT (Fan Turbine Inlet Temperature), TIT (Turbine Inlet Temperature), and EGT (Exhaust Gas Temperature) are more commonly used to assess the performance and condition of the turbine section.

Submit
88.   (617) Primary aids that outline minimum inspection requirements are called

Explanation

Inspection work cards are primary aids that outline minimum inspection requirements. They provide a structured format for inspectors to follow during inspections and ensure that all necessary inspections are conducted. Sequence charts typically refer to diagrams that show the order of steps or events, and they are not specifically related to inspections. Inspection checklists are also used during inspections, but they are not referred to as primary aids that outline minimum inspection requirements. Work schedule guides are documents that outline the schedule and tasks for a specific job, but they are not specifically related to inspections. Therefore, the correct answer is inspection work cards.

Submit
89. (623) Which component on a GTCP 165 engine shuts the engine down if the oil pressure drops below the safe minimum operating limit?

Explanation

The oil pressure switch is responsible for shutting down the GTCP 165 engine if the oil pressure drops below the safe minimum operating limit. This component is designed to monitor the oil pressure and act as a safety measure to protect the engine from potential damage caused by insufficient oil pressure. If the oil pressure falls below the safe limit, the switch will trigger a shutdown of the engine to prevent any further operation that could potentially harm the engine.

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90.   (623) The accessory drive section forward housing on a GTCP 165 engine provides mounts for components, including the fuel control unit, oil pump assembly, oil filter element, vane-axial fan assembly, and

Explanation

The accessory drive section forward housing on a GTCP 165 engine provides mounts for various components, including the fuel control unit, oil pump assembly, oil filter element, vane-axial fan assembly, and air/oil cooler. This means that the air/oil cooler is one of the components that is mounted on the accessory drive section forward housing.

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91.   (608) Trim means to adjust the engine systems for optimum performance according to the TO's limits. The two methods used to trim an engine are

Explanation

The correct answer is manual and electronic. Trim refers to adjusting the engine systems for optimum performance within the limits specified in the TO (Technical Order). Two methods used for trimming an engine are manual, which involves physically adjusting certain components, and electronic, which involves using computer systems to optimize performance.

Submit
92.   (617) What inspection and maintenance concept provides a method for performing required inspections on a scheduled and controlled basis?

Explanation

Planned inspection and maintenance concept refers to a systematic approach where inspections are conducted on a scheduled and controlled basis. This means that inspections are planned in advance and carried out at regular intervals to ensure that all necessary inspections are performed in a timely manner. This approach helps to prevent any unexpected breakdowns or failures by identifying and addressing any potential issues before they become major problems. Therefore, the concept of planned inspections provides a method for performing required inspections on a scheduled and controlled basis.

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93. (603) 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 includes various components such as the starter, generator, and accessories like the tachometer drive. The tachometer drive is responsible for transmitting the rotational speed of the engine to the N2 tachometer generator, which then measures and displays the N2 turbine speed. Therefore, the correct answer is engine accessory section.

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94.   (609) 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 check the pressure in the oil system, and the output side of the main oil pump is where the oil is being pumped out into the system. The vent system is also connected to the output side of the main oil pump to release any excess pressure in the system. Therefore, connecting the pressure gauges at these points would provide an accurate measurement of the oil system pressure.

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95.   (610) The aircraft noise suppressor shutdown procedure is important because it

Explanation

The correct answer is "prevents engine turbine wheel damage." The aircraft noise suppressor shutdown procedure is important because it ensures that the noise suppressor is not damaged by improper engine shutdown procedures. This is particularly important for the engine turbine wheel, as improper shutdown can cause damage to this component. By following the correct shutdown procedure, the engine turbine wheel is protected from potential harm, thus preventing damage and ensuring the proper functioning of the aircraft.

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96. (619) What is the probable cause of compressor rotor shift?

Explanation

The probable cause of compressor rotor shift is thrust bearing failure. When the thrust bearing fails, it is unable to support the axial load on the rotor, causing it to shift. This shift can lead to various issues, such as misalignment, increased vibration, and decreased efficiency of the compressor. Therefore, thrust bearing failure is the most likely cause of compressor rotor shift.

Submit
97. (603) What indicates the amount of thrust a dual-compressor engine is producing?

Explanation

EPR stands for Engine Pressure Ratio and it is a measure of the amount of thrust a dual-compressor engine is producing. It is calculated by dividing the total pressure at the engine inlet by the total pressure at the engine exhaust. EPR is commonly used in aviation to monitor and control engine performance, as it provides a direct indication of the engine's thrust output. RPM (Rotations Per Minute) is a measure of the engine's rotational speed, EGT (Exhaust Gas Temperature) indicates the temperature of the engine's exhaust gases, and TIT (Turbine Inlet Temperature) measures the temperature of the air entering the turbine.

Submit
98. (604) The test cell fuel-flow rate indicator automatically controls the fuel module's solenoid valves in order to divert fuel flow through the

Explanation

The test cell fuel-flow rate indicator is responsible for controlling the fuel module's solenoid valves. These valves are used to divert fuel flow through the flow turbines. Therefore, the correct answer is flow turbines.

Submit
99.   (623) Which signals are used by the fuel control unit to control engine operation on a GTCP 165 engine?

Explanation

The fuel control unit on a GTCP 165 engine uses engine speed and pneumatic thermostat (load control) air pressure signals to control engine operation. Engine speed is an important parameter as it indicates the rotational speed of the engine and affects the fuel flow rate. The pneumatic thermostat air pressure is used to regulate the load on the engine, ensuring that it operates within the desired range. By monitoring and adjusting these signals, the fuel control unit can optimize the engine's performance and maintain its stability.

Submit
100.   (623) The accessory drive section aft housing on a GTCP 165 engine contains the

Explanation

The correct answer is the compressor front shaft bearing. The accessory drive section aft housing on a GTCP 165 engine contains various components, including the fuel control unit, oil pump assembly, vane-axial fan assembly, and the compressor front shaft bearing. The compressor front shaft bearing is responsible for supporting and allowing the rotation of the compressor front shaft, which is an essential part of the engine's operation.

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(615) You can get information such as temperature and barometric...
(603) The oil pressure indicator receives an electrical signal from...
(614) Which of these is not considered a cause of FOD?
615) The steps in removing the engine and test equipment from the test...
  (618) What inspection is given to all newly assigned aircraft?
(614) When an engine arrives for a test run at the test cell, it must
(614) Immediately prior to an engine test cell run, you check the...
615) What should you do with the engine model and serial number when...
(615) Before installing an engine on the test cell thrust stand, make...
  (603) Which metals are used in the EGT indicating system...
  (618) Which of these inspections is a flight preparedness...
(613) What two types of test cells does the Air Force currently use?
  (622) The pneumatic air bled from the small gas turbine engine...
(603) The fuel-flow indicator indicates the rate of fuel flow as
(605) What engine vibration does not persist, but comes and goes?
(606) Which type of vibration transducer is made of certain ceramic...
  (601) To become an expert troubleshooter, you must
  (602) Which F100-PW–220 engine monitoring system...
(623) For engine shutdown on the GTCP 165 engine, what valve closes to...
  (603) A typical jet engine EGT indicating system contains...
  (603) Most jet-powered aircraft engine fuel-flow indicating...
(620) What causes over-temperature damage to the combustion chamber...
  (602) What F100-PW–220 engine monitoring system...
(613) The swivel pads at the bottom of the leveling jacks on the...
  (603) To be considered effective tools for aviators, aircraft...
  (622) When used for ground operation, the SGT engine can be...
(606) When using a vibration analyzer how are you notified when a...
(615) Observing oil on the turbine wheel or oil smoke at or near the...
(612) Which testing engine is equipped with a QEC kit?
(619) Careless operation of the throttle during emergency system...
  (601) Which of the following is not a proper troubleshooting...
(613) The basic portable test cell's thrust trailer rails adjust to a...
  (603) Most engine-monitoring gauges and instruments require...
(607) What supports the fan and low-pressure turbine?
(612) In addition to determining the condition of a repaired or...
(623) Air for the load control system on a GTCP 165 engine is...
(603) One type of overheat detector unit used on aircraft engines...
(603) For an operational check of the fire warning system, you press
  (618) A BPO is done
  (601) Where should you begin troubleshooting after reviewing...
(604) The display range of the test cell IC temperature indicator is
(616) What information is used as an aid in test facility inspections?
(611) When inspecting the hush house, you are not required to check...
(623) During a normal start on a GTCP 165 engine, the igniter plug...
(603) The term Pt2 means the
  (622) What controls turbine discharge temperature on a GTCP...
  (618) Which inspection is a combination of the BPO/hourly...
  (603) Which jet engine temperature is not measured?
  (609) When doing an anti-ice valve operational check on an...
  (603) Understanding the operating principles of engine...
(613) The portable test cell's vibration pickups are cooled by the
  (608) You can find written instructions for safe flight-line...
(613) Which test cell noise suppressors use water to cool the exhaust...
(615) When preparing to install the miscellaneous kit prior to a test...
(611) The sidewalls of the hush house test bay is constructed of
(623) The modulating and shutoff valve on a GTCP 165 engine will be...
(620) What condition describes turbine nozzles that are burned out...
(621) Galling of bearing rolling elements and races is characterized...
(603) The tachometer indicating system's two primary units are the...
(603) The tachometer generator's frequency is proportional to the
  (622) The impeller wheel and two turbine wheels in the turbine...
(611) What hush house feature allows flexibility when running an...
(613) In a fixed test cell, the test bay access doors are sealed to
(620) Turbine blade fatigue failure does not result from
(603) How is inlet Pt2 transmitted from its sensing point?
  (601) The troubleshooting information contained in aircraft...
(615) Where would you begin your investigation of an engine with a...
(614) Improperly rigged throttle linkage during a test cell run can...
607) What procedure ensures that the fan and low-pressure turbine are...
(603) What converts the exhaust nozzle's position on engines with...
  (617) Which of the following is not an inspection phase?
  (610) Aircraft noise suppressors have how many primary air...
(611) Before moving an aircraft into the hush house, you must inspect...
(611) The hush house exhaust deflector is constructed of
(623) What circuit trips to stop the engine during normal GTCP 165...
(613) The vertical baffles in the fixed test cell's exhaust stack are...
(613) The portable test cell is not equipped with a
(606) Where do you find the instructions for installing vibration...
(605) What engine vibration usually causes the most concern?
(619) A cold compressor stall occurring at low RPM accompanied by a...
(604) The test cell's EGT selector allows selecting
(613) The portable test cell's noise suppressor is not equipped with
(604) When connected to an engine oil pressure line the direct oil...
(605) What type of vibration causes unnecessary engine removals and...
(605) In vibration analysis, frequency is usually measured in
(612) When testing a TF34 engine at test cell, which test ensures that...
  (609) When checking the turbine section, you do not measure
  (617) Primary aids that outline minimum inspection...
(623) Which component on a GTCP 165 engine shuts the engine down if...
  (623) The accessory drive section forward housing on a GTCP...
  (608) Trim means to adjust the engine systems for optimum...
  (617) What inspection and maintenance concept provides a...
(603) The N2 tachometer generator is usually driven from the...
  (609) The pressure gauges used for an oil system pressure...
  (610) The aircraft noise suppressor shutdown procedure is...
(619) What is the probable cause of compressor rotor shift?
(603) What indicates the amount of thrust a dual-compressor engine is...
(604) The test cell fuel-flow rate indicator automatically controls...
  (623) Which signals are used by the fuel control unit to...
  (623) The accessory drive section aft housing on a GTCP 165...
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