2A651 Edition2 Volume 5

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1. (833) Which inspection is conducted by maintenance personnel after an occurrence of a specific or unusual condition?

Explanation

After an occurrence of a specific or unusual condition, maintenance personnel conduct a special inspection. This inspection is carried out to assess and identify any potential damage or issues caused by the condition. It allows maintenance personnel to determine the necessary repairs or replacements needed to ensure the continued safe and efficient operation of the equipment or system.

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About This Quiz
2A651 Edition2 Volume 5 - Quiz

This quiz, titled '2a651 edition2 volume 5', assesses skills in aircraft engine troubleshooting. It focuses on practical scenarios like observing gauge indications, prioritizing unit repairs, and using troubleshooting charts, aiming to enhance expertise in understanding aircraft systems.

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2. (803) An understanding of the operating principles of engine instruments will help you decide

Explanation

An understanding of the operating principles of engine instruments is important in order to interpret the readings provided by these instruments. By understanding the meanings of the instrument readings, one can determine the performance and condition of the engine. This knowledge is necessary to make informed decisions about whether an engine should be removed from an aircraft or sent to the test cell for further examination and maintenance.

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3. (805) The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow

Explanation

The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow transmitter and a fuel-flow indicator. This system is responsible for measuring and displaying the rate at which fuel is flowing into the engine. The fuel-flow transmitter measures the flow of fuel and sends this information to the fuel-flow indicator, which then displays the data to the pilot. This allows the pilot to monitor the fuel consumption and make any necessary adjustments during the flight.

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

Explanation

The correct answer is to eliminate items that could possibly cause foreign object damage (FOD). This is important because loose nuts, bolts, lock wire, tools, or any other material left in the engine or quick engine change (QEC) kit could potentially get sucked into the engine during the test run, causing damage to the engine and potentially leading to a catastrophic failure. By checking and removing any loose items before the test, the risk of FOD is minimized, ensuring the safety and proper functioning of the engine.

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5. (828) Responsibility for the proper preventive maintenance of a test cell facility rests with the

Explanation

The correct answer is "individuals assigned". This means that the responsibility for the proper preventive maintenance of a test cell facility rests with the individuals who have been assigned to that task. It implies that there is no specific unit or squadron designated for this responsibility, but rather it is the duty of the individuals who have been assigned to the test cell facility.

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6. (803) Most engine monitoring gauges and instruments require some type of

Explanation

Most engine monitoring gauges and instruments require a transmitter and indicator because these devices work together to measure and display various parameters of the engine. The transmitter converts the physical measurements into electrical signals, which are then transmitted to the indicator. The indicator receives these signals and displays the readings on the gauge or instrument panel. Therefore, both the transmitter and indicator are necessary components for accurate engine monitoring.

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7. (804) A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, an indicator, and

Explanation

A typical jet engine exhaust gas temperature (EGT) indicating system contains a resistor. The resistor is used to measure the temperature of the exhaust gas. The thermocouples and leads are used to sense the temperature and transmit the signal to the indicator. The indicator then displays the temperature reading. The turbine inlet and control valve are not directly related to the EGT indicating system.

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8. (834) 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 and excessive changes in throttle position can disrupt the airflow through the engine, leading to a loss of compressor efficiency and potentially causing the compressor to stall.

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9. (809) During an operational check of the fire warning system, you press

Explanation

Pressing only the TEST switch during the operational check of the fire warning system is the correct answer. This is because the TEST switch is specifically designed to initiate a test of the system, allowing the operator to verify its functionality. Pressing both the TEST and NORMAL switches or only the TEST WARNING ON switch would not provide a comprehensive test of the system. Pressing both the TEST ON and TEST OFF switches is not a valid option as there is no mention of these switches in the question.

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10. (801) 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 means having a comprehensive knowledge and understanding of how each component within a system works and interacts with other components. This knowledge allows troubleshooters to accurately diagnose and fix issues that may arise within a system. While being a 7-level, having at least 5 years of experience, and attending college courses in troubleshooting techniques may contribute to becoming an expert troubleshooter, understanding the function of each unit within each system is the most essential factor in achieving expertise.

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11. (827) When making general entries on the test cell engine log sheet, what should you do with the engine model and serial number?

Explanation

When making general entries on the test cell engine log sheet, it is important to verify the engine model and serial number on the engine data plate. This ensures that the correct information is recorded and avoids any mistakes or discrepancies in the log sheet. Checking past records may provide some reference, but it is crucial to verify the numbers on the engine data plate to ensure accuracy. Entering these numbers only after the test is complete may lead to errors if the wrong numbers are recorded during the test.

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12. (803) 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 space is limited in an aircraft cockpit, and there are numerous instruments that need to be installed. Therefore, having small instruments allows for efficient use of space and ensures that all necessary instruments can be accommodated without cluttering the cockpit. Additionally, small instruments are also easier to read and manipulate, which is crucial for pilots who need to quickly and accurately interpret the information provided by the instruments while flying.

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13. (804) Which metals are used in the thermocouples of the exhaust gas temperature (EGT) indicating system?

Explanation

Alumel and chromel are used in the thermocouples of the exhaust gas temperature (EGT) indicating system. These metals are commonly used in thermocouples due to their high temperature resistance and good electrical conductivity. Alumel is an alloy of nickel, manganese, aluminum, and silicon, while chromel is an alloy of nickel and chromium. The combination of these two metals allows for accurate temperature measurement in high-temperature environments such as exhaust systems.

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14. (807) The two primary units of the tachometer indicating system are the tachometer generator and tachometer

Explanation

The tachometer indicating system consists of two primary units: the tachometer generator and the indicator. The tachometer generator is responsible for generating electrical signals based on the rotational speed of the engine, while the indicator is the device that displays the speed on the tachometer. Therefore, the correct answer is "indicator".

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15. (801) After reviewing the aircraft/engine forms, where should you begin troubleshooting?

Explanation

To begin troubleshooting after reviewing the aircraft/engine forms, one should observe gauge indications. This is because gauge indications provide valuable information about the performance and condition of various systems in the aircraft/engine. By observing the gauge indications, one can identify any abnormal readings or discrepancies that may indicate a problem or malfunction. This is a logical starting point as it allows for a systematic approach to identifying and resolving any issues.

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16. (801) If you encounter engine trouble where more than one unit is at fault, you would first

Explanation

The correct answer is to examine the unit that requires the least amount of time to replace. This is because when encountering engine trouble where more than one unit is at fault, it is more efficient to start by examining and potentially replacing the unit that can be replaced quickly. This allows for a quicker diagnosis and resolution of the problem, and if it does not fix the issue, then further examination and replacement of other units can be done.

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17. (814) The filter selector switch on the vibration analyzer is used to

Explanation

The filter selector switch on the vibration analyzer allows the user to choose the appropriate filter for analyzing the vibration data. Different filters are used to isolate specific frequencies or ranges of frequencies, allowing for a more accurate assessment of the vibration characteristics. By selecting the necessary filter, the user can focus on the specific vibration components of interest and eliminate any unwanted noise or interference.

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18. (826) Prior to conducting a test cell run, you must determine the specific engine's correct type and grade of oil used, which can be found in the

Explanation

To determine the specific engine's correct type and grade of oil used, one should refer to the applicable engine publications. These publications contain the necessary information regarding the engine's oil requirements and specifications. It is important to consult these publications to ensure that the correct oil is used during the test cell run, as using the wrong type or grade of oil could potentially damage the engine. The base engine manager's office may have some information, but the most accurate and up-to-date information can be found in the applicable engine publications. The test cell oil formulas and periodic checklist for the engine may not provide the specific information required for determining the correct type and grade of oil.

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19. (828) How often are service inspections conducted on the test cell?

Explanation

Service inspections are conducted on the test cell on a daily basis. This means that the inspections occur every day, ensuring that the test cell is regularly checked for any issues or maintenance needs. Conducting daily service inspections helps to ensure the proper functioning and safety of the test cell, allowing any problems to be identified and addressed promptly.

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20. (821) What hush house feature allows for flexibility when you are running an engine that has been removed from the airframe?

Explanation

The thrust stand sliding into position on tracks allows for flexibility when running an engine that has been removed from the airframe. This feature allows the engine to be securely positioned and tested while providing the ability to adjust its position as needed.

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21. (830) Which one of these inspections is a flight preparedness check?

Explanation

A preflight inspection is a flight preparedness check conducted before each flight to ensure that the aircraft is in proper condition and ready for operation. It involves a thorough examination of various components, systems, and documentation to verify their functionality and compliance with safety regulations. This inspection is crucial for identifying any potential issues or discrepancies that could affect the safety and performance of the aircraft during flight. Therefore, preflight is the correct answer as it accurately represents the inspection conducted to ensure flight preparedness.

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22. (813) Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?

Explanation

A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of generating an electric charge when subjected to mechanical stress or vibration. This electric charge is then converted into an electrical signal that can be measured and analyzed to determine the level and frequency of the vibration. Therefore, a piezoelectric accelerometer is the correct type of vibration transducer that is made up of certain ceramic compounds and natural crystals.

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23. (801) Aircraft power plant and engine intermediate maintenance technical orders (TO) contain information on troubleshooting. This information is presented in the form of

Explanation

Aircraft power plant and engine intermediate maintenance technical orders (TO) contain troubleshooting charts. These charts provide a step-by-step guide to identify and resolve issues with the power plant and engine systems. They help maintenance personnel diagnose and fix problems efficiently by providing a systematic approach to problem-solving. Troubleshooting charts typically include a series of questions or steps to follow, leading the user to the most likely cause of the issue and suggesting appropriate corrective actions.

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24. (826) Which of these is not considered a cause of foreign object damage (FOD)?

Explanation

Foreign object damage (FOD) refers to the damage caused to an aircraft or its components due to the presence of foreign objects. Ingestion of bolts, formation of ice, and ingestion of rocks are all examples of foreign objects that can cause FOD. However, the failure of internal parts is not considered a cause of FOD. FOD typically occurs when foreign objects come into contact with the aircraft during operation, causing damage to its structure or systems. Internal part failures, on the other hand, are typically caused by mechanical or electrical issues within the aircraft itself, rather than external objects.

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25. (819) Where are the primary silencers positioned on an aircraft noise suppressor?

Explanation

The primary silencers on an aircraft noise suppressor are positioned against the aircraft fuselage. This means that they are located next to or in contact with the outer structure of the aircraft.

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26. (802) What system is used on most modern jet engines to gather and record engine data?

Explanation

The correct answer is Engine monitoring system (EMS). This system is used on most modern jet engines to gather and record engine data. It allows for real-time monitoring of various engine parameters such as temperature, pressure, and fuel consumption. This data is then recorded and analyzed to ensure optimal engine performance and detect any potential issues or malfunctions. The EMS plays a crucial role in maintaining the safety and efficiency of jet engines.

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27. (826) In what step of a test cell leak check do you accomplish a final check for leaks?

Explanation

During engine coast down, a final check for leaks is accomplished in a test cell leak check. This step involves observing the engine as it slows down after being shut off, and checking for any signs of leaks or abnormal fluid levels. This is an important step to ensure that there are no leaks in the test cell, which could affect the accuracy of the test results and potentially cause damage to the equipment.

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

Explanation

Transient engine vibration refers to vibrations that occur intermittently or sporadically, rather than persistently. These vibrations may come and go, and are typically caused by temporary factors such as changes in engine load or operating conditions. Unlike resonance vibrations, which occur at specific frequencies, transient vibrations do not have a consistent pattern or frequency. Similarly, externally excited vibrations are caused by external factors such as road conditions or wind, whereas transient vibrations can originate from within the engine itself.

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29. (814) When you are using a vibration analyzer, you will be notified when a preset signal has been exceeded by

Explanation

When using a vibration analyzer, a preset signal is exceeded, the user will be notified by a flashing channel indicator light emitting diode (LED).

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30. (816) When operating an engine that is installed on aircraft, position the aircraft so the wind is blowing

Explanation

When operating an engine that is installed on an aircraft, it is important to position the aircraft so that the wind is blowing directly into the inlet, within ±45°. This is because the inlet is designed to take in air for the engine's combustion process, and having the wind blow directly into the inlet helps to ensure a proper air-to-fuel mixture. Additionally, positioning the aircraft within ±45° allows for some flexibility in wind direction while still maintaining an effective airflow into the engine.

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

Explanation

The turbine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility. This is because the turbine area is a critical component of the engine and any foreign objects, such as debris or particles, can cause damage and affect the performance and safety of the engine. Therefore, it is important to inspect and ensure that the turbine area is free from any FOD before operating the engine.

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32. (807) The frequency of the tachometer generator is proportional to the

Explanation

The tachometer generator is a device that measures the speed of an engine. It generates a frequency signal that is proportional to the engine speed. Therefore, the correct answer is "engine speed" as the frequency of the tachometer generator directly corresponds to the speed of the engine.

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33. (836) Which characteristic is the most common cause of bearing failure?

Explanation

Complete loss of lubrication is the most common cause of bearing failure. Bearings rely on lubrication to reduce friction and prevent excessive heat and wear. Without proper lubrication, the bearing surfaces can become damaged, leading to failure. Transient vibration, partial loss of lubrication, and stall condition over temperature can also contribute to bearing failure, but complete loss of lubrication is the most significant factor.

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34. (823) 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 suppressor is a permanent installation or a portable unit, water is used as a cooling mechanism for the exhaust gases.

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35. (835) Turbine blade fatigue failure does not result from

Explanation

Turbine blade fatigue failure does not result from blends. This means that the blending process used in manufacturing turbine blades does not contribute to their fatigue failure. Fatigue failure is typically caused by repeated stress and strain on the blades over time, leading to cracks and eventual failure. Nicks, dents, and scratches can potentially weaken the blades and contribute to fatigue failure, but blends do not have this effect.

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36. (802) Which component in F100-PW–220 engine monitoring system transfers information from the engine diagnostic unit (EDU) to the ground station unit (GSU)?

Explanation

The correct answer is the Data Collection Unit (DCU). The DCU is responsible for collecting and storing data from various components of the engine monitoring system, including the Engine Diagnostic Unit (EDU). It then transfers this information to the Ground Station Unit (GSU) for analysis and monitoring. The DCU plays a crucial role in ensuring that the engine is functioning properly and any issues or abnormalities can be detected and addressed in a timely manner.

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37. (818) Which F–16 operational check allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine?

Explanation

Dry motoring is the correct answer because it allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. Dry motoring is a procedure used to test the JFS and ensure its proper functioning without actually starting the engine. This check is important for safety and maintenance purposes.

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

Explanation

Engines that have been involved in an incident or a mishap need to be tested in addition to determining the condition of a repaired or overhauled engine. This is because these engines may have suffered damage or experienced abnormal conditions during the incident or mishap, and it is important to ensure that they are still in proper working order before being used again. Testing these engines helps to identify any potential issues or damage that may have occurred, allowing for necessary repairs or further investigation to be conducted.

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39. (824) Engines are mounted in the fixed test cell on a thrust stand or are suspended

Explanation

Engines are mounted from a cradle mount. This means that the engines are suspended or supported by a cradle-like structure. This method of mounting allows for stability and ease of testing, as the engines can be securely held in place while measurements and assessments are conducted.

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40. (810) The term Pt2 means the

Explanation

not-available-via-ai

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41. (827) During a test cell run, if you observe oil on the turbine wheel or oil smoke at or near the turbine section, this is a good indication of

Explanation

If oil is observed on the turbine wheel or oil smoke is seen at or near the turbine section during a test cell run, it is a good indication of a damaged aft bearing oil seal. This suggests that there is a problem with the seal that is allowing oil to escape and potentially causing the smoke. It is important to address this issue to prevent further damage to the turbine system.

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42. (827) If an engine stalls or surges during a test cell run, you should investigate the

Explanation

If an engine stalls or surges during a test cell run, the variable stator vanes should be investigated. Variable stator vanes are components in a gas turbine engine that help control the airflow and optimize engine performance. If these vanes are not functioning properly, it can cause disruptions in the airflow, leading to engine stalls or surges. Therefore, it is important to examine the variable stator vanes if such issues occur during a test cell run.

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43. (804) Which jet engine temperature is not measured?

Explanation

The combustion inlet temperature is not measured in a jet engine. Temperature measurements are typically taken at the exhaust gas, turbine inlet, and fan turbine inlet. The combustion inlet is the location where fuel is introduced into the engine, and measuring the temperature at this point is not necessary for engine operation or monitoring.

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44. (821) Before moving an aircraft into the hush house, you must inspect the aircraft

Explanation

Before moving an aircraft into the hush house, it is necessary to inspect the aircraft and its forms. This means that not only the physical condition of the aircraft needs to be checked, but also any necessary paperwork or documentation related to the aircraft must be reviewed. This ensures that the aircraft is in proper working order and all necessary paperwork is in place before it is moved into the hush house.

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45. (823) A portable test cell is not equipped with a

Explanation

A portable test cell is a mobile unit used for testing engines or other equipment. It is not equipped with a control cab, which is a separate compartment for operating the test cell. It also does not have a thrust trailer, which is used for measuring the thrust produced by the engine. Additionally, it does not come with a miscellaneous equipment kit, which could include various tools and instruments needed for testing. The correct answer is the hydraulically operated pylon mount cradle, which is a device used for mounting the engine or equipment being tested.

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46. (807) The tachometer indicator is

Explanation

The correct answer is "an electric magnetic-drag-type instrument." This means that the tachometer indicator is an instrument that uses electricity and a magnetic drag mechanism to measure and display the speed of rotation of a motor or engine. This type of tachometer is commonly used in vehicles and other machinery to provide accurate and reliable speed readings.

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47. (815) What are used to support the fan and low-pressure turbine?

Explanation

Bearings are used to support the fan and low-pressure turbine. Bearings are mechanical components that reduce friction between moving parts and support the weight of rotating shafts. In this case, bearings are used to support the fan and low-pressure turbine, allowing them to rotate smoothly and efficiently. Bushings, brackets, and blades are not specifically designed for this purpose and would not provide the necessary support and functionality.

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48. (828) 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 approach to inspecting the test facility, ensuring that all necessary areas and equipment are inspected. They help to ensure that inspections are conducted consistently and efficiently, and that all required inspections are completed. By using periodic inspection checklists, test facility inspectors can identify any potential issues or deficiencies and take appropriate corrective actions.

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49. (806) The oil pressure indicator receives an electrical signal from the

Explanation

The oil pressure indicator receives an electrical signal from the transmitter. This means that the transmitter is responsible for sending information about the oil pressure to the indicator. The other options, gyro, hydraulic unit, and synchronous unit, do not make sense in the context of an oil pressure indicator. A gyro is typically used for measuring rotation, a hydraulic unit is used for transmitting power through fluids, and a synchronous unit is used for maintaining constant speed. Therefore, the correct answer is transmitter.

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50. (811) While testing an engine on an engine test cell, a breather pressure gauge displaying excessively high breather pressure is usually an indication of

Explanation

Excessively high breather pressure in an engine test cell is usually an indication of damage to engine bearing oil seals. This is because damaged oil seals can cause an increase in pressure within the engine's breather system, leading to the high pressure readings on the gauge. This issue can result in oil leakage, reduced engine performance, and potential damage to other engine components.

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51. (812) During vibration analysis, amplitude is measured in mils. One mil is equal to

Explanation

During vibration analysis, the amplitude is measured in mils. One mil is equal to 0.001 inch. This means that when measuring the amplitude of vibrations, each mil represents a thousandth of an inch. Therefore, the correct answer is 0.001 inch.

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52. (825) On the portable test cell, the swivel pads at the bottom of the leveling jacks on the engine thrust trailer provide for all of the following except

Explanation

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

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53. (829) Which one is not an inspection phase?

Explanation

The correct answer is Home station check (HSC). This is because the other options - Fix, Look, and Preinspection - all refer to activities that can be considered as inspection phases. Home station check (HSC), on the other hand, is not typically categorized as an inspection phase.

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54. (821) After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of

Explanation

After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of 3 minutes. This allows the engine to cool down gradually and prevent any damage to the augmentor tube. Running the engine at idle for a longer period of time may not be necessary and could waste fuel. Running the engine at idle for a shorter period of time may not provide enough cooling for the augmentor tube. Therefore, running the engine at idle for 3 minutes strikes a balance between sufficient cooling and efficiency.

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55. (822) Which testing engine is equipped with a quick engine change (QEC) kit?

Explanation

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

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56. (811) The test cell integrated circuit (IC) temperature indicator displays temperatures in degrees Fahrenheit, with a range of

Explanation

The correct answer is –50 to +1,600. This is because the test cell integrated circuit (IC) temperature indicator displays temperatures in degrees Fahrenheit, and the given range of –50 to +1,600 falls within this range.

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57. (802) If there's a problem in the F100-PW–220 aircraft engine, the digital electronic engine control (DEEC)

Explanation

The correct answer is "accommodates the fault and sends fault code to the engine diagnostic unit (EDU)." This means that when there is a problem in the F100-PW-220 aircraft engine, the digital electronic engine control (DEEC) system will acknowledge the fault and transmit a fault code to the engine diagnostic unit (EDU) for further analysis and troubleshooting.

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

Explanation

The engine diagnostic unit (EDU) is the component of the F100-PW-220 engine monitoring system that acquires fault data from the digital electronic engine control (DEEC) and logs the faults with the time of their occurrence. It is responsible for diagnosing and monitoring the engine's performance and detecting any faults or abnormalities. The EDU plays a critical role in ensuring the safe and efficient operation of the engine by providing valuable diagnostic information to maintenance personnel.

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59. (836) Bearing failure from moisture, lack of protective oils, improper handling, or prolonged improper storage could cause

Explanation

Bearing failure can occur due to various reasons such as moisture, lack of protective oils, improper handling, or prolonged improper storage. In this case, the correct answer is corrosion pitting. Corrosion pitting refers to the formation of small pits or holes on the surface of the bearing due to the corrosive action of moisture or other substances. This can weaken the bearing and lead to its failure.

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

Explanation

The test bay access doors in a fixed test cell are sealed to prevent unwanted noise from getting into the control room. This is important because excessive noise can interfere with the accuracy of the test results and make it difficult for the operators in the control room to communicate effectively. By sealing the doors, the test bay can be kept insulated and provide a quieter environment for the control room personnel.

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61. (824) In the fixed test cell, air for the engine intake comes through baffles located on the

Explanation

In a fixed test cell, the air for the engine intake comes through baffles located on the ceiling. This means that the air is being drawn from the top of the test cell rather than the floor, side walls, or front doors. The baffles on the ceiling help to direct and control the airflow into the engine intake, ensuring that it is consistent and accurate during testing.

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62. (810) What is used to indicate the amount of thrust a dual-compressor engine is producing?

Explanation

Engine pressure ratio (EPR) is used to indicate the amount of thrust a dual-compressor engine is producing. EPR is a ratio of the total pressure at the engine inlet to the total pressure at the engine exhaust. It provides a measure of the efficiency of the engine and is directly related to the amount of thrust being produced. By monitoring the EPR, pilots and engineers can assess the performance of the engine and make adjustments as necessary.

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

Explanation

The test cell exhaust gas temperature (EGT) selector allows the user to choose between reading the EGT parameter for transit speeds, using the accuracy check switch during adjustment, reading the EGT indicator in digital or analog, or selecting individual thermocouple inputs or an average of these inputs.

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64. (813) To find the instructions for installing vibration pickups at the test cell, you should check the

Explanation

The correct answer is the intermediate maintenance manual because this manual typically contains detailed instructions for installing and maintaining equipment at a specific level of maintenance. Since installing vibration pickups falls under the category of maintenance, the intermediate maintenance manual would be the most appropriate source to find the instructions for this task.

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65. (810) The pressures used in the operation of the engine pressure ratio (EPR) system are the

Explanation

The correct answer is engine inlet total pressure and exhaust total pressure. The EPR system in the engine relies on these two pressures to operate effectively. The engine inlet total pressure represents the pressure of the air entering the engine, while the exhaust total pressure represents the pressure of the exhaust gases leaving the engine. By monitoring and controlling these pressures, the EPR system can optimize the engine's performance and efficiency.

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66. (820) What forms the sidewalls of the test bay portion of a hush house?

Explanation

The sidewalls of the test bay portion of a hush house are formed by observation ports. These observation ports allow for visual inspection and monitoring of the activities happening inside the test bay. They provide a clear view of the test equipment and aircraft being tested, allowing technicians and engineers to observe and analyze the performance and behavior of the aircraft during testing.

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67. (820) The hush house exhaust deflector is constructed of

Explanation

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

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68. (805) The fuel system component of a jet engine that operates by using a water wheel concept is the fuel

Explanation

The fuel system component of a jet engine that operates by using a water wheel concept is the flow transmitter. A flow transmitter is a device that measures the flow rate of a fluid, in this case, the fuel, and converts it into an electrical signal. The water wheel concept refers to the mechanism used in the flow transmitter to measure the flow rate, which is similar to how a water wheel measures the flow of water. Therefore, the correct answer is flow transmitter.

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69. (806) Two units that work together to indicate the oil system is operating correctly are the oil pressure

Explanation

The correct answer is transmitter and indicator. Transmitter and indicator are two units that work together to indicate the oil system is operating correctly. The transmitter measures the oil pressure and sends the signal to the indicator, which displays the pressure reading. This allows operators to monitor the oil pressure and ensure that it is within the desired range for proper system operation.

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

Explanation

A phased inspection is a combination of the basic post-flight (BPO)/hourly post-flight and periodic inspection (PE) requirements. This type of inspection involves both the routine checks that are done after each flight or a certain number of flight hours, as well as the more comprehensive inspections that are done at specific intervals. It is a comprehensive inspection that covers both the basic and periodic requirements, making it the correct answer in this case.

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71. (819) The shutdown procedure for the aircraft noise suppressor is important because it

Explanation

The shutdown procedure for the aircraft noise suppressor is important because it ensures that the noise suppressor will be operational for the next aircraft. This means that by following the proper shutdown procedure, the noise suppressor will not be damaged and will be ready for use in the next aircraft.

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

Explanation

The correct answer is through tubing. This means that the inlet pressure is transmitted from its sensing point to another location using tubing. This method allows for the pressure to be measured or monitored remotely without the need for direct electrical, mechanical, or hydraulic connections.

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73. (826) Before operating an engine at the test cell, you must always check its status as indicated on the

Explanation

Before operating an engine at the test cell, it is necessary to check its status as indicated on the engine forms. These forms contain important information about the engine's maintenance history, any recent repairs or modifications, and any ongoing issues or concerns. By reviewing the engine forms, the operator can ensure that the engine is in a suitable condition for testing and identify any potential risks or problems that may need to be addressed before proceeding. The crew chief's log book of maintenance performed, the maintenance log book, and the aircraft forms may contain relevant information, but the engine forms specifically pertain to the engine's status.

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74. (811) When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (rpm) will be within

Explanation

When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (rpm) will be within 2 rpm. This means that the readings on the speed indicator may deviate from the actual speed by a maximum of 2 rpm.

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75. (812) 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 aerodynamic forces, structural interactions, or other external sources. These vibrations can lead to unnecessary engine removals and unwarranted repairs because they are not inherent to the engine itself, but rather caused by external factors. This means that addressing the external source of the vibration can prevent the need for engine removals and repairs, saving time and resources.

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76. (825) The vibration pickups on the portable test cell are cooled by the

Explanation

The correct answer is pneumatic system. The vibration pickups on the portable test cell are cooled by the pneumatic system. This means that the system uses compressed air to cool the vibration pickups, rather than using engine oil, the atmosphere, or hydraulic fluid.

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77. (825) The noise suppressor at a portable test cell is not equipped with

Explanation

The noise suppressor at a portable test cell is not equipped with a fuel trailer. This means that the noise suppressor does not have a fuel trailer attached to it. A fuel trailer is a separate piece of equipment used for transporting and storing fuel, and it is not necessary for the functioning of the noise suppressor.

Submit
78. (815) What procedure is used to ensure the fan and low-pressure turbine are correctly balanced?

Explanation

The procedure used to ensure the fan and low-pressure turbine are correctly balanced is called fan rotor trim balance. This procedure involves adjusting the weight distribution of the fan rotor to achieve proper balance, which helps to reduce vibration and improve overall performance of the engine. By balancing the fan rotor, any potential issues or imbalances can be identified and corrected, ensuring smooth and efficient operation of the engine.

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79. (818) Prior to starting the engine when doing an anti-ice valve operational check on an F–16C/D, place the anti-ice engine switch to

Explanation

When performing an anti-ice valve operational check on an F-16C/D, the correct step is to place the anti-ice engine switch to OFF. This is because the purpose of the check is to ensure that the anti-ice valve is functioning properly. By placing the switch to OFF, it allows for a controlled test of the valve's operation without the engine being started.

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

Explanation

The correct answer is hourly post-flight items. The home station check (HSC) inspection includes a combination of the basic post-flight (BPO) and hourly post-flight items. This means that during the HSC inspection, the aircraft is checked for any issues or damage that may have occurred during the flight, as well as completing specific tasks that are required to be done on an hourly basis. The HSC inspection is an important part of maintaining the aircraft's safety and readiness for future flights.

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81. (834) Which symptom is not an indication of a compressor stall?

Explanation

A drop in exhaust gas temperature is not an indication of a compressor stall. A compressor stall occurs when the airflow through the compressor is disrupted, leading to a loss of thrust and fluctuating fuel flow. However, a drop in exhaust gas temperature could be caused by other factors such as a malfunctioning fuel system or a decrease in power demand.

Submit
82. (806) An oil pressure transmitter contains a mechanical section and

Explanation

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83. (811) The direct oil pressure gauge on a test cell is connected to an engine oil pressure line to indicate oil pressure without using wiring, indicator, or

Explanation

The direct oil pressure gauge on a test cell is connected to an aircraft transmitter to indicate oil pressure without using wiring, indicator, or engine transformer. The aircraft transmitter is responsible for converting the oil pressure into a signal that can be transmitted wirelessly to the gauge. This allows for a more efficient and convenient way of monitoring the oil pressure without the need for additional wiring or transformers.

Submit
84. (813) The two types of transducers used to measure vibration are

Explanation

The correct answer is piezoelectric accelerometer and velocity. Piezoelectric accelerometers are used to measure vibration by converting mechanical motion into an electrical charge. Velocity transducers measure vibration by detecting the velocity of an object or surface. Therefore, both piezoelectric accelerometers and velocity transducers are used to measure vibration.

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85. (829) Primary aids that outline minimum inspection requirements are called

Explanation

Inspection work cards are primary aids that outline minimum inspection requirements. These cards provide a checklist of tasks that need to be completed during an inspection. They serve as a guide for inspectors, ensuring that all necessary inspections are carried out and nothing is missed. These cards help maintain consistency and accuracy in inspections by providing a standardized set of requirements to follow.

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86. (834) What is the probable cause of compressor rotor shift?

Explanation

Thrust bearing failure is the probable cause of compressor rotor shift. When the thrust bearing fails, it is unable to support the axial load exerted on the rotor, causing it to shift. This can lead to misalignment and imbalance in the compressor rotor, resulting in various issues such as reduced efficiency, increased vibration, and potential damage to other components.

Submit
87. (834) Compressor section failure from a chain reaction due to blade-to-blade and blade-to-vane interference is known as

Explanation

This question is asking for the term that describes the compressor section failure caused by interference between the blades and vanes. The correct answer is "circumferential force." This term refers to the force exerted in a circular direction around the circumference of the compressor section, which can cause failure when there is interference between the blades and vanes.

Submit
88. (812) During vibration analysis, frequency is usually measured in

Explanation

Frequency is a measure of how many cycles occur in a given time period. In the context of vibration analysis, frequency refers to the number of vibrations or oscillations that occur per second. Therefore, it is logical to measure frequency in cycles per second, which is also known as Hertz (Hz).

Submit
89. (816) The term trim means to adjust the engine systems for optimum performance per the limits in the technical order (TO). The two methods used to trim an engine are

Explanation

The term "trim" refers to adjusting the engine systems for optimum performance within the limits specified in the technical order (TO). This adjustment can be done using two methods: manual and electronic. The manual method involves making physical adjustments to the engine components, while the electronic method involves using electronic systems and controls to optimize the engine performance. Therefore, the correct answer is manual and electronic.

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90. (808) On engines with afterburners, the position of the exhaust nozzle is converted into an electrical signal by a

Explanation

On engines with afterburners, the position of the exhaust nozzle needs to be converted into an electrical signal. A transducer is a device that converts one form of energy into another. In this case, it converts the mechanical movement of the exhaust nozzle into an electrical signal that can be used by the engine control system. A rheostat, rectifier, and transformer are not suitable for this purpose as they do not perform the required conversion of energy.

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

Explanation

A transient check is performed during testing of a TF34 engine at a test cell to ensure that all operating limits and schedules, from idle to maximum power, are within limits. This test involves simulating various transient conditions, such as rapid throttle movements and load changes, to assess the engine's response and ensure that it remains within the specified limits throughout the entire operating range. This helps to verify the engine's performance and reliability under different operating conditions.

Submit
92. (829) During what inspection phase are operational checks made according to the technical order (TO)?

Explanation

Operational checks are made after the inspection phase according to the technical order (TO). This means that once the inspection is completed, the operational checks are performed to ensure that the equipment or system is functioning correctly and meeting the required operational standards. This helps to identify any potential issues or malfunctions that may have been missed during the inspection phase. Therefore, the correct answer is post-inspection.

Submit
93. (817) When checking the turbine section, you do not measure

Explanation

When checking the turbine section, you do not measure the intake gas temperature (IGT). The turbine section of a turbine engine is responsible for converting the energy from the combustion process into mechanical energy to drive the compressor and other engine components. The temperature measurements that are typically taken in the turbine section include the fan turbine inlet temperature (FTIT), turbine inlet temperature (TIT), and exhaust gas temperature (EGT). However, the intake gas temperature (IGT) is not typically measured in the turbine section.

Submit
94. (811) The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to divert fuel flow through the

Explanation

The test cell fuel-flow rate indicator is responsible for automatically controlling the solenoid valves in the fuel module. This control is necessary in order to divert the fuel flow through the flow turbines.

Submit
95. (834) A cold compressor stall that occurs at low revolutions per minute (rpm) and is accompanied by a slight over temperature is called

Explanation

An incipient cold compressor stall refers to a stall that occurs at low rpm and is accompanied by a slight over temperature. It is considered as the early stage or beginning of a stall.

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    Answered ()
(833) Which inspection is conducted by maintenance personnel after an...
(803) An understanding of the operating principles of engine...
(805) The engine fuel-flow indicating system of most jet powered...
(826) Immediately prior to an engine test cell run, you should check...
(828) Responsibility for the proper preventive maintenance of a test...
(803) Most engine monitoring gauges and instruments require some type...
(804) A typical jet engine exhaust gas temperature (EGT) indicating...
(834) Careless operation of the throttle during emergency system...
(809) During an operational check of the fire warning system, you...
(801) To become an expert troubleshooter, you must
(827) When making general entries on the test cell engine log sheet,...
(803) To be considered effective tools for aviators, aircraft...
(804) Which metals are used in the thermocouples of the exhaust gas...
(807) The two primary units of the tachometer indicating system are...
(801) After reviewing the aircraft/engine forms, where should you...
(801) If you encounter engine trouble where more than one unit is at...
(814) The filter selector switch on the vibration analyzer is used to
(826) Prior to conducting a test cell run, you must determine the...
(828) How often are service inspections conducted on the test cell?
(821) What hush house feature allows for flexibility when you are...
(830) Which one of these inspections is a flight preparedness check?
(813) Which type of vibration transducer is made up of certain ceramic...
(801) Aircraft power plant and engine intermediate maintenance...
(826) Which of these is not considered a cause of foreign object...
(819) Where are the primary silencers positioned on an aircraft noise...
(802) What system is used on most modern jet engines to gather and...
(826) In what step of a test cell leak check do you accomplish a final...
(812) What kind of engine vibration does not persist, but comes and...
(814) When you are using a vibration analyzer, you will be notified...
(816) When operating an engine that is installed on aircraft, position...
(826) Which engine area should be checked for foreign object damage...
(807) The frequency of the tachometer generator is proportional to the
(836) Which characteristic is the most common cause of bearing...
(823) Which test cell noise suppressors use water to cool the exhaust...
(835) Turbine blade fatigue failure does not result from
(802) Which component in F100-PW–220 engine monitoring system...
(818) Which F–16 operational check allows you to start the jet...
(822) In addition to determining the condition of a repaired or...
(824) Engines are mounted in the fixed test cell on a thrust stand or...
(810) The term Pt2 means the
(827) During a test cell run, if you observe oil on the turbine wheel...
(827) If an engine stalls or surges during a test cell run, you should...
(804) Which jet engine temperature is not measured?
(821) Before moving an aircraft into the hush house, you must inspect...
(823) A portable test cell is not equipped with a
(807) The tachometer indicator is
(815) What are used to support the fan and low-pressure turbine?
(828) What information is used as an aid in test facility inspections?
(806) The oil pressure indicator receives an electrical signal from...
(811) While testing an engine on an engine test cell, a breather...
(812) During vibration analysis, amplitude is measured in mils. One...
(825) On the portable test cell, the swivel pads at the bottom of the...
(829) Which one is not an inspection phase?
(821) After running an engine in augmentation in the hush house, the...
(822) Which testing engine is equipped with a quick engine change...
(811) The test cell integrated circuit (IC) temperature indicator...
(802) If there's a problem in the F100-PW–220 aircraft engine,...
(802) The F100-PW–220 engine monitoring system component that...
(836) Bearing failure from moisture, lack of protective oils, improper...
(824) In a fixed test cell, the test bay access doors are sealed to
(824) In the fixed test cell, air for the engine intake comes through...
(810) What is used to indicate the amount of thrust a dual-compressor...
(811) The test cell exhaust gas temperature (EGT) selector allows...
(813) To find the instructions for installing vibration pickups at the...
(810) The pressures used in the operation of the engine pressure ratio...
(820) What forms the sidewalls of the test bay portion of a hush...
(820) The hush house exhaust deflector is constructed of
(805) The fuel system component of a jet engine that operates by using...
(806) Two units that work together to indicate the oil system is...
(831) Which inspection is a combination of the basic post-flight...
(819) The shutdown procedure for the aircraft noise suppressor is...
(810) Inlet pressure (Pt2) is transmitted from its sensing point
(826) Before operating an engine at the test cell, you must always...
(811) When properly adjusted, the accuracy of the test cell N1 and N2...
(812) What type of vibration causes unnecessary engine removals and...
(825) The vibration pickups on the portable test cell are cooled by...
(825) The noise suppressor at a portable test cell is not equipped...
(815) What procedure is used to ensure the fan and low-pressure...
(818) Prior to starting the engine when doing an anti-ice valve...
(832) The home station check (HSC) inspection is a combination of the...
(834) Which symptom is not an indication of a compressor stall?
(806) An oil pressure transmitter contains a mechanical section and
(811) The direct oil pressure gauge on a test cell is connected to an...
(813) The two types of transducers used to measure vibration are
(829) Primary aids that outline minimum inspection requirements are...
(834) What is the probable cause of compressor rotor shift?
(834) Compressor section failure from a chain reaction due to...
(812) During vibration analysis, frequency is usually measured in
(816) The term trim means to adjust the engine systems for optimum...
(808) On engines with afterburners, the position of the exhaust nozzle...
(822) When testing a TF34 engine at test cell, which test is performed...
(829) During what inspection phase are operational checks made...
(817) When checking the turbine section, you do not measure
(811) The test cell fuel-flow rate indicator automatically controls...
(834) A cold compressor stall that occurs at low revolutions per...
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