2A651 Volume 5 Aircraft Troubleshooting

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Quizzes Created: 1 | Total Attempts: 122

Questions: 95 | Attempts: 122 | Updated: Mar 27, 2023

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2A651 Volume 5 Aircraft Troubleshooting - Quiz

Questions and Answers

1.

After reviewing the aircraft/engine forms, where should you begin troubleshooting?
- A.
  
  Examine most complex unit.
- B.
  
  Observe guage indications.
- C.
  
  Check each part of every system
- D.
  
  Discuss problem with other journeyman in the shop.
Correct Answer
B. Observe guage indications.

Explanation
To begin troubleshooting after reviewing the aircraft/engine forms, one should observe gauge indications. Gauge indications provide valuable information about the performance and condition of various systems in the aircraft/engine. By carefully observing gauge indications, any anomalies or discrepancies can be identified, which can then be further investigated to pinpoint the root cause of the problem. This approach allows for a systematic and focused troubleshooting process, starting with the most visible and measurable indicators of system performance.

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2.

If you encounter engine trouble where more than one unit is at fault, you would first
- A.
  
  Go back and check engine forms again
- B.
  
  Replace all if the units suspected to be at fault
- C.
  
  Try to repair the more complex unit on the spot
- D.
  
  Examine the unit that requires the least amount of time to replace
Correct Answer
D. Examine the unit that requires the least amount of time to replace

Explanation
When encountering engine trouble where more than one unit is at fault, examining the unit that requires the least amount of time to replace would be the first step. This is because replacing the unit that requires less time can help identify if it was the main cause of the trouble. By examining and potentially replacing this unit first, it can help narrow down the issue and potentially solve the problem without having to go through the more time-consuming process of replacing all suspected units or repairing the more complex unit on the spot.

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3.

Aircraft power plant and engine intermediate maintenance technical orders (TO) contain information on troubleshooting. This information is presented in the form of
- A.
  
  Troubleshooting charts.
- B.
  
  Mechanical drawings
- C.
  
  Power plant charts
- D.
  
  Fix-it diagrams
Correct Answer
A. Troubleshooting charts.

Explanation
Aircraft power plant and engine intermediate maintenance technical orders (TO) contain troubleshooting information, which is presented in the form of troubleshooting charts. These charts provide a systematic approach to identifying and resolving problems or malfunctions in the power plant and engine systems. By following the steps outlined in the troubleshooting charts, maintenance personnel can effectively diagnose and rectify issues, ensuring the proper functioning of the aircraft's power plant and engine.

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4.

To becmoe and expert troubleshooter, you must
- A.
  
  Be a 7 level
- B.
  
  Have at least 5 years experience
- C.
  
  Attend college courses in troubleshooting techniques
- D.
  
  Understand the function of each unit within each system
Correct Answer
D. Understand the function of each unit within each system

Explanation
To become an expert troubleshooter, it is crucial to understand the function of each unit within each system. This knowledge allows troubleshooters to identify and diagnose problems accurately. By understanding how each unit operates within a system, troubleshooters can effectively troubleshoot and resolve issues. This expertise is essential for becoming a skilled troubleshooter and providing efficient solutions to complex problems.

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5.

What system is used on most modern jet engines to gather and record engine data?
- A.
  
  Engine start system (ESS)
- B.
  
  Engine monitoring system (EMS)
- C.
  
  Supervisory control system (SCS)
- D.
  
  Supervisory monitoring system (SMS)
Correct Answer
B. Engine monitoring system (EMS)

Explanation
The engine monitoring system (EMS) is used on most modern jet engines to gather and record engine data. This system is responsible for monitoring various parameters such as temperature, pressure, fuel flow, and vibration levels. It provides real-time data to the pilots and maintenance crew, allowing them to monitor the engine's performance and detect any abnormalities or potential issues. The recorded data can also be analyzed later for maintenance purposes and to improve engine efficiency and reliability.

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6.

The F100-PW-220 engine monitoring system componenent that acquires fault data from the digital electronic control (DEEC) and logs the faults with the time of their occurrence is the
- A.
  
  Data collection unit (DCU)
- B.
  
  Ground station unit (GSU)
- C.
  
  Engine analyzer unit (EAU)
- D.
  
  Engine diagnostic unit (EDU)
Correct Answer
D. Engine diagnostic unit (EDU)

Explanation
The engine diagnostic unit (EDU) is the component of the F100-PW-220 engine monitoring system that acquires fault data from the digital electronic control (DEEC) and logs the faults with the time of their occurrence. It is responsible for diagnosing any issues or faults that may occur in the engine and keeping a record of them. This allows for effective troubleshooting and maintenance of the engine, ensuring optimal performance and safety. The data collection unit (DCU), ground station unit (GSU), and engine analyzer unit (EAU) are not specifically mentioned as performing this function, making the engine diagnostic unit (EDU) the correct answer.

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7.

Which component in the F100-PW-220 engine monitoring system transfers information from the engine diagnostic unit (EDU) to the ground station unit (GSU)?
- A.
  
  Data collection unit (DCU)
- B.
  
  Engine analyzer unit (EAU)
- C.
  
  Match number (Mn) test system
- D.
  
  Supervisory control system (SCS)
Correct Answer
A. Data collection unit (DCU)

Explanation
The Data collection unit (DCU) is the component in the F100-PW-220 engine monitoring system that transfers information from the engine diagnostic unit (EDU) to the ground station unit (GSU). This unit is responsible for collecting and organizing data from various sensors and diagnostic systems within the engine, and then transmitting that information to the GSU for further analysis and monitoring. The DCU acts as a bridge between the EDU and the GSU, ensuring that important engine performance data is transferred accurately and efficiently.

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8.

If there's a problem in the F100-PW-220 aircraft engine, the digital electronic engine control (DEEC)
- A.
  
  Trips and engine no-go flag
- B.
  
  Turns on cokcpit lights to warn the pilot
- C.
  
  Trips and engine monitoring unit (EMS) maintenance flag
- D.
  
  Accommodates the fault and sends the fault code to the engine diagnostic unit (EDU)
Correct Answer
D. Accommodates the fault and sends the fault code to the engine diagnostic unit (EDU)

Explanation
In the event of a problem in the F100-PW-220 aircraft engine, the digital electronic engine control (DEEC) accommodates the fault and sends the fault code to the engine diagnostic unit (EDU). This means that the DEEC is designed to handle faults within the engine and communicates the specific fault code to the EDU for further analysis and diagnosis. This allows maintenance personnel to identify the exact issue and take appropriate action to resolve it. It does not involve tripping the engine no-go flag, turning on cockpit lights, or tripping the engine monitoring unit (EMS) maintenance flag.

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9.

To be considered effective tools for avaiators, aircraft instruments must be light weight, easy to read, and
- A.
  
  Small in size
- B.
  
  Analog readout
- C.
  
  Digital readout
- D.
  
  Cheap to manufacture
Correct Answer
A. Small in size

Explanation
To be considered effective tools for aviators, aircraft instruments must be small in size. This is because in the limited space of an aircraft cockpit, there is a need for compact instruments that do not take up too much space. Additionally, smaller instruments are easier to install and arrange in the cockpit, allowing for better visibility and accessibility for the pilot. Therefore, small size is an important characteristic for aircraft instruments to ensure their effectiveness in aviation operations.

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10.

An understanding of the operating principles of engine instruments will help you decide
- A.
  
  If an engine should be removed from an aircraft
- B.
  
  If the engine should be sent to test cell
- C.
  
  The meanings of the intrument readings
- D.
  
  What tools are required for maintenance
Correct Answer
C. The meanings of the intrument readings

Explanation
An understanding of the operating principles of engine instruments is important in order to interpret the readings provided by these instruments. By knowing the meanings of the instrument readings, one can determine the current status and performance of the engine. This knowledge is crucial in making decisions such as whether an engine should be removed from an aircraft or sent to a test cell for further examination. Additionally, understanding instrument readings helps in identifying any maintenance or repair requirements and determining the necessary tools and procedures for maintenance.

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11.

Most engine monitoring guages and instruments require some type of
- A.
  
  Electrical valve to the indicator
- B.
  
  Metal tubing for electron flow
- C.
  
  Radio frequency transmitter
- D.
  
  Transmitter and indicator
Correct Answer
D. Transmitter and indicator

Explanation
Most engine monitoring gauges and instruments require a transmitter and indicator. The transmitter is responsible for converting the physical measurements, such as temperature or pressure, into electrical signals. These signals are then sent to the indicator, which displays the readings in a format that can be easily interpreted by the operator. The transmitter and indicator work together to provide accurate and real-time information about the engine's performance, allowing for effective monitoring and troubleshooting.

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12.

Which jet engine temperature is not measured?
- A.
  
  Exhaust gas
- B.
  
  Turbine inlet
- C.
  
  Combustion inlet
- D.
  
  Fan turbine inlet
Correct Answer
C. Combustion inlet

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 refers to the area where the air and fuel mix and ignite, and it is not necessary to measure the temperature at this point.

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13.

A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, and indicator, and
- A.
  
  Resistor
- B.
  
  Turbine inlet
- C.
  
  Control valve
- D.
  
  Exhaust duct
Correct Answer
A. Resistor

Explanation
The given answer, "resistor," is correct because a typical jet engine exhaust gas temperature (EGT) indicating system includes thermocouples, leads, and an indicator, as well as a resistor. The resistor is an essential component in the system as it helps to regulate the electrical current and provide accurate temperature readings. It works in conjunction with the thermocouples to measure the temperature of the exhaust gas and transmit the data to the indicator for display.

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14.

Which metals are used in the thermocouples of the exhaust gas temperature (EGT) indicating system?
- A.
  
  Steel and iron
- B.
  
  Steel and alumel
- C.
  
  Iron and chromel
- D.
  
  Alumel and chromel
Correct Answer
D. Alumel and chromel

Explanation
Alumel and chromel are used in the thermocouples of the exhaust gas temperature (EGT) indicating system. Thermocouples are temperature sensors that work based on the principle of the Seebeck effect, which generates a voltage when there is a temperature difference between two different metals. Alumel and chromel are specific alloys that are commonly used in type K thermocouples, which are suitable for measuring high temperatures, such as those found in exhaust gas systems. Therefore, alumel and chromel are the correct metals used in the EGT indicating system.

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15.

The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow
- A.
  
  Transmitter
- B.
  
  Control valve and a float valve
- C.
  
  Transmitter and a fuel-flow indicator
- D.
  
  Control valve and a fuel-flow transcriber
Correct Answer
C. Transmitter and a fuel-flow indicator

Explanation
The engine fuel-flow indicating system of most jet powered aircraft consists of a transmitter and a fuel-flow indicator. The transmitter is responsible for measuring the fuel flow and transmitting this information to the fuel-flow indicator. The fuel-flow indicator then displays the fuel flow rate to the pilot. This system allows the pilot to monitor the amount of fuel being consumed by the engine, which is crucial for maintaining optimal performance and ensuring sufficient fuel supply during the flight.

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16.

The fuel system component of a jet engine that operates by using a water wheel concept is the fuel
- A.
  
  Flow indicator
- B.
  
  Flow generator
- C.
  
  Flow transmitter
- D.
  
  Remaining counter
Correct Answer
C. Flow transmitter

Explanation
A flow transmitter is a component of a jet engine's fuel system that operates by using a water wheel concept. This means that it measures the flow of fuel by using a wheel-like mechanism similar to a water wheel. The flow transmitter is responsible for accurately measuring and transmitting the information about the fuel flow to other components of the jet engine, ensuring that the engine receives the correct amount of fuel for optimal performance.

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17.

Two units that work together to indicate the oil system is operating correctly are the oil pressure
- A.
  
  Relief valve and indicator
- B.
  
  Transmitter and indicator
- C.
  
  Relief valve and transmitter
- D.
  
  Synchronous unit and indicator
Correct Answer
B. Transmitter and indicator

Explanation
The oil pressure 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 a signal to the indicator, which displays the pressure reading. This allows the operator to monitor the oil pressure and ensure it is within the desired range.

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18.

An oil pressure transmitter contains a mechanical section and
- A.
  
  Hydraulic unit
- B.
  
  An electrical unit
- C.
  
  A pnuedraulic unit
- D.
  
  A synchronous unit
Correct Answer
D. A synchronous unit

Explanation
A synchronous unit is the correct answer because an oil pressure transmitter typically consists of both mechanical and electrical components. The mechanical section is responsible for measuring the oil pressure, while the electrical unit converts this mechanical measurement into an electrical signal that can be transmitted and used for monitoring or control purposes. The term "synchronous" refers to the synchronization between the mechanical and electrical components, ensuring accurate and reliable measurement of oil pressure.

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19.

The oil pressure indicator receives an electrical signal from the
- A.
  
  Gyro
- B.
  
  Transmitter
- C.
  
  Hydraulic unit
- D.
  
  Synchronous unit
Correct Answer
B. Transmitter

Explanation
The oil pressure indicator receives an electrical signal from the transmitter. This means that the transmitter is responsible for sending the information about the oil pressure to the indicator. The transmitter is likely connected to the oil system and measures the pressure, converting it into an electrical signal that can be interpreted by the indicator. Without the transmitter, the oil pressure indicator would not receive any information and would not be able to display the oil pressure accurately.

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20.

The two primary units of the tachometer indicating system are the tachometer generator and tachometer
- A.
  
  Indicator
- B.
  
  Fuse panel
- C.
  
  Transformer
- D.
  
  Thermocouple
Correct Answer
A. Indicator

Explanation
The tachometer indicating system consists of two primary units: the tachometer generator and the tachometer indicator. The tachometer generator is responsible for converting the rotational speed of the engine into an electrical signal, while the tachometer indicator displays this signal as a visual reading. The other options listed (fuse panel, transformer, thermocouple) are not directly related to the tachometer indicating system and therefore are not the correct answer.

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21.

The tachometer indicator is
- A.
  
  Mechanical magnetic-drag-type instrument
- B.
  
  An electric magnetic-drag-type instrument
- C.
  
  A mechanical direct-drive-type instrument
- D.
  
  An electric direct-drive type instrument
Correct Answer
B. An electric magnetic-drag-type instrument

Explanation
The tachometer indicator is an electric magnetic-drag-type instrument. This means that it uses an electric current and a magnetic field to create drag, which in turn controls the movement of the indicator. This type of instrument is commonly used in vehicles to measure the rotational speed of the engine. The electric magnetic-drag-type instrument provides accurate readings and is reliable in measuring the engine's RPM (revolutions per minute).

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22.

The frequency of the tachometer generator generator is proportional to the
- A.
  
  Engine speed
- B.
  
  Transformer speed
- C.
  
  Speed of the electrical magnet
- D.
  
  Speed of the alternating magnet
Correct Answer
A. Engine speed

Explanation
The tachometer generator is a device that measures the rotational speed of an engine. It generates an electrical signal whose frequency is directly proportional to the engine speed. As the engine speed increases, the frequency of the generated signal also increases. Therefore, the correct answer is "engine speed".

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23.

On engines with afterburners, the position of the exhaust nozzle is converted into an electrical signal by a
- A.
  
  Rheostat
- B.
  
  Recitifier
- C.
  
  Transducer
- D.
  
  Transformer
Correct Answer
C. Transducer

Explanation
A transducer is a device that converts one form of energy into another. In the case of engines with afterburners, the position of the exhaust nozzle needs to be converted into an electrical signal. A transducer is capable of converting the mechanical motion of the nozzle into an electrical signal, allowing it to be measured and controlled. This makes transducer the most suitable option among the given choices.

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24.

During an operational check of the fire warning system, you press
- A.
  
  Only the TEST switch
- B.
  
  Both TEST and NORMAL switches
- C.
  
  Only the TEST WARNING ON switch
- D.
  
  Both TEST ON and TEST OFF switches
Correct Answer
A. Only the TEST switch

Explanation
Pressing only the TEST switch during an operational check of the fire warning system ensures that the system is functioning properly. This switch is specifically designed to initiate a test of the fire warning system, allowing the operator to verify that the system is capable of detecting and alerting for potential fires. By pressing only the TEST switch, the operator can isolate the test function and ensure that the system is not inadvertently switched to a different mode or setting. Pressing any other switches could potentially interfere with the accuracy of the test or compromise the system's functionality.

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25.

What is used to indicate the amount of thrust a dual-compressor engine is producing?
- A.
  
  Enging pressure ratio (EPR)
- B.
  
  Revolutions per minute (RPM)
- C.
  
  Exhaust gas temperature (EGT)
- D.
  
  Turbine inlet temperature (TIT)
Correct Answer
A. Enging pressure ratio (EPR)

Explanation
The correct answer is Enging pressure ratio (EPR). The EPR is used to indicate the amount of thrust a dual-compressor engine is producing. It is a ratio of the total pressure at the engine inlet to the total pressure at the engine exhaust. By measuring this ratio, engineers can determine the efficiency and performance of the engine. RPM, EGT, and TIT are other important parameters in engine performance, but they do not directly indicate the amount of thrust being produced.

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26.

The term Pt2 means the
- A.
  
  Total (t) pressure (P) at flange 2 (2)
- B.
  
  Total (t) pressure (P) at station 2 (2)
- C.
  
  Temperature (t) and pressure (P) at flange 2 (2)
- D.
  
  Temperature (t) and pressure (p) at station 2 (2)
Correct Answer
B. Total (t) pressure (P) at station 2 (2)

Explanation
The term Pt2 refers to the total pressure (P) at station 2 (2). This means that it represents the combined pressure at a specific location or point in a system, in this case, station 2. The term "total" indicates that it includes all components of pressure at that particular station, such as static pressure, dynamic pressure, and any other relevant factors.

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27.

The pressure used in the operation of the engine pressure ratio (EPR) system are the
- A.
  
  Engine inlet total pressure and exhaust total pressure
- B.
  
  Exhaust total pressure and turbine inlet total pressure
- C.
  
  Inlet total pressure and compressor discharge total pressure
- D.
  
  Compressor discharge total pressure and turbine inlet total pressure
Correct Answer
A. Engine inlet total pressure and exhaust total pressure

Explanation
The EPR system in an engine relies on the engine inlet total pressure and exhaust total pressure. The engine inlet total pressure refers to the pressure at the entrance of the engine, while the exhaust total pressure is the pressure at the exit of the engine. By comparing these two pressures, the EPR system can determine the ratio of the pressures and provide valuable information about the engine's performance. The other options listed do not include both the engine inlet total pressure and exhaust total pressure, making them incorrect choices.

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28.

Inlet pressure (Pt2) is transmitted from its sensing point
- A.
  
  Electrically
- B.
  
  Mechanically
- C.
  
  Hydraulically
- D.
  
  Through tubing
Correct Answer
D. Through tubing

Explanation
The correct answer is "through tubing". Inlet pressure is transmitted from its sensing point through tubing. This means that the pressure is transferred from the point where it is sensed to another location using tubing as a medium. This method allows for the pressure to be measured or monitored at a different location, which may be more convenient or suitable for the intended application.

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29.

While testing an engine on an engine test cell, a breather pressure guage displaying excessively high breather pressure is usually an indication of
- A.
  
  Maladjusted engine pressure ratio system
- B.
  
  The oil system being underserviced
- C.
  
  Damaged to engine bearing oil seals
- D.
  
  Low oil pressure
Correct Answer
C. Damaged to engine bearing oil seals

Explanation
Excessively high breather pressure on an engine test cell usually indicates damaged engine bearing oil seals. This is because damaged oil seals can cause excessive pressure to build up in the breather system, leading to higher readings on the pressure gauge. Maladjusted engine pressure ratio system, underserviced oil system, and low oil pressure may cause other issues but are not directly related to the breather pressure gauge displaying high pressure.

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30.

The direct oil pressure guage on a test cell is connected to an engine oil pressure line to indicate oil pressure without using wiring, indicator, or
- A.
  
  Aircraft transformer
- B.
  
  Engine transformer
- C.
  
  Aircraft transmitter
- D.
  
  Engine transmitter
Correct Answer
C. Aircraft transmitter

Explanation
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 engine transformer. Instead, an aircraft transmitter is used. An aircraft transmitter is a device that converts the oil pressure into an electrical signal, which is then transmitted to the gauge. This allows for accurate and real-time monitoring of the oil pressure without the need for additional wiring or transformers.

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31.

Test cell exhaust gas temperature (EGT) selector allows selection of
- A.
  
  The EGT paramater for transit speeds
- B.
  
  Accuracy check switch during adjustment
- C.
  
  The EGT indicator to be read in digital or anolog
- D.
  
  Individual thermocouple inputs or an average of the inputs
Correct Answer
D. Individual thermocouple inputs or an average of the inputs

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

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32.

The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to divert fuel flow through the
- A.
  
  Fuel control
- B.
  
  Flow turbines
- C.
  
  Fuel-oil coolers
- D.
  
  Flow cascades
Correct Answer
B. Flow turbines

Explanation
The correct answer is "flow turbines." The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module to divert fuel flow through the flow turbines. This suggests that the flow turbines play a crucial role in the fuel flow system and are directly controlled by the fuel-flow rate indicator. The other options, fuel-oil coolers and flow cascades, do not seem to be directly related to the fuel flow control system.

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33.

When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per mimnute (RPM) will be within
- A.
  
  1 rpm
- B.
  
  2 rpm
- C.
  
  3 rpm
- D.
  
  4 rpm
Correct Answer
B. 2 rpm

Explanation
The accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (RPM) will be within 2 RPM when properly adjusted. This means that the indicated speed on the test cell will be within 2 RPM of the actual speed.

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34.

The test cell integrated circuit (IC) temperature indicator displays temperatures in degress Fahrenheit, with a range of
- A.
  
  -100 to +1,000
- B.
  
  -75 to +1,400
- C.
  
  -50 to +1,600
- D.
  
  -25 to +1,800
Correct Answer
C. -50 to +1,600

Explanation
The correct answer is -50 to +1,600. This range is the widest among the given options and covers a larger span of temperatures. It allows for a more comprehensive display of temperatures, ranging from very low temperatures (-50 degrees Fahrenheit) to high temperatures (+1,600 degrees Fahrenheit). This range is suitable for a test cell integrated circuit temperature indicator as it can accommodate a wide range of temperature variations that may be encountered in different testing scenarios.

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35.

What type of vibration causes unnecessary engine removals and unwarranted repairs?
- A.
  
  Forced
- B.
  
  Transient
- C.
  
  Unbalanced
- D.
  
  Externally excited
Correct Answer
D. Externally excited

Explanation
Externally excited vibrations refer to vibrations that are caused by external factors such as external forces or mechanical interactions. These vibrations can lead to unnecessary engine removals and unwarranted repairs because they are not inherent to the engine itself and can be difficult to diagnose and fix. External factors such as misalignment, loose components, or resonance can create vibrations that mimic internal engine issues, leading to unnecessary maintenance. Therefore, externally excited vibrations can cause confusion and result in unnecessary engine removals and repairs.

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36.

What kind of engine vibration does not persist, but comes and goes?
- A.
  
  Forced
- B.
  
  Transient
- C.
  
  Resonance
- D.
  
  Externally excited
Correct Answer
B. Transient

Explanation
Transient engine vibration refers to a type of vibration that occurs intermittently and does not persist continuously. It comes and goes, usually in response to certain conditions or events. This type of vibration is often caused by temporary disturbances or variations in the engine's operation or environment. It is different from forced vibration, which is caused by a steady external force, and resonance, which is a sustained vibration at a specific frequency. Transient engine vibration is not externally excited, as it originates from within the engine itself.

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37.

During vibration analysis, frequency is usually measured in
- A.
  
  Mils
- B.
  
  Phase lags
- C.
  
  Cycles per second
- D.
  
  Phases per second
Correct Answer
C. Cycles per second

Explanation
During vibration analysis, frequency is usually measured in cycles per second. This is because frequency represents the number of complete cycles or oscillations that occur in one second. It is a fundamental parameter used to analyze vibrations and is commonly expressed in cycles per second, also known as Hertz (Hz). This measurement helps in identifying the rate or speed at which the vibration is occurring, allowing for further analysis and understanding of the vibration behavior.

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38.

During vibration analysis, amplitude is measured in mils. One mil is equal to
- A.
  
  1.000 inch
- B.
  
  0.100 inch
- C.
  
  0.010 inch
- D.
  
  0.001 inch
Correct Answer
D. 0.001 inch

Explanation
During vibration analysis, amplitude is measured in mils. One mil is equal to 0.001 inch. This means that when measuring the amplitude of vibration, each mil represents a distance of 0.001 inch. Therefore, if the amplitude is measured as 5 mils, it would mean that the vibration is occurring with a displacement of 0.005 inch.

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39.

The two types transducers used to measure vibration are
- A.
  
  Velocity and phase accelerometer
- B.
  
  Velocity and displacement acceloromter
- C.
  
  Piezoelectric accelorometer and velocity
- D.
  
  Piezoelectric accelorometer and phase lag transducer
Correct Answer
C. Piezoelectric accelorometer and velocity

Explanation
The correct answer is piezoelectric accelerometer and velocity. Piezoelectric accelerometers are sensors that generate an electrical charge proportional to the acceleration they experience. They are commonly used to measure vibration. Velocity transducers, on the other hand, measure the rate of change of displacement over time. By combining the measurements from a piezoelectric accelerometer and a velocity transducer, a more comprehensive understanding of vibration can be obtained.

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40.

Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?
- A.
  
  Velocity
- B.
  
  Phase log
- C.
  
  Displacement accelorometer
- D.
  
  Piezolectric accelorometer
Correct Answer
D. Piezolectric accelorometer

Explanation
A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of producing an electric charge when subjected to mechanical stress or vibration. This charge is then converted into a voltage signal, which can be measured and used to determine the magnitude and frequency of the vibration. Therefore, a piezoelectric accelerometer is the correct type of vibration transducer that is made up of these specific materials.

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41.

To find the instructions for installing vibration pickups at the test cells, you should check the
- A.
  
  Test cell technical order
- B.
  
  Intermediate maintenance manual
- C.
  
  Organizational maintenance manual
- D.
  
  Methods and procedures maintenance manual
Correct Answer
B. Intermediate maintenance manual

Explanation
The intermediate maintenance manual is the correct answer because it typically contains detailed instructions and procedures for installing and maintaining equipment at the test cells. This manual is specifically designed for technicians at the intermediate maintenance level, providing them with the necessary guidance to perform their tasks effectively and safely. Therefore, checking the intermediate maintenance manual would be the most appropriate source to find the instructions for installing vibration pickups at the test cells.

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42.

When you are using a vibration analyzer, you will be notified when a preset signal has been exceeded by
- A.
  
  A horn alarm
- B.
  
  Flashing red lights
- C.
  
  The sound of a buzzer
- D.
  
  Flashing channel indicator light emitting diode (LED)
Correct Answer
D. Flashing channel indicator light emitting diode (LED)

Explanation
When using a vibration analyzer, the device will notify you when a preset signal has been exceeded by flashing channel indicator light emitting diode (LED). This means that the LED light on the analyzer will start flashing to indicate that the signal has surpassed the predetermined threshold. This visual cue is used to alert the user that the vibration levels have exceeded the acceptable range.

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43.

The filter selector switch on the vibration analyzer is used to
- A.
  
  Provide an exact RPM indication
- B.
  
  Indicate the amplitude of the overall vibration
- C.
  
  Display the frequency of the overall engine
- D.
  
  Allow selection of the necessary filter
Correct Answer
D. Allow selection of the necessary filter

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

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44.

What are used to support the fan and low-pressure turbine?
- A.
  
  Bushings
- B.
  
  Brackets
- C.
  
  Bearings
- D.
  
  Blades
Correct Answer
C. Bearings

Explanation
Bearings are used to support the fan and low-pressure turbine. Bearings are mechanical devices that reduce friction between moving parts, allowing them to rotate smoothly. In this case, bearings are used to support the fan and low-pressure turbine, ensuring that they can rotate efficiently and without excessive friction. Bushings, brackets, and blades are not specifically designed for supporting rotating parts like fans and turbines, making them incorrect options.

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45.

What procedure is uded to ensure the fan and low-pressure turbine are correctly balanced?
- A.
  
  Engine trim
- B.
  
  Fan rotor trim balance
- C.
  
  Low-pressure turbine rotor trim balance
- D.
  
  High-pressure turbine rotor trim balance
Correct Answer
B. Fan rotor trim balance

Explanation
To ensure that the fan and low-pressure turbine are correctly balanced, the procedure used is called "Fan rotor trim balance." This involves adjusting the fan rotor's alignment and weight distribution to achieve optimal balance, thereby minimizing vibrations and ensuring smooth operation of the fan and low-pressure turbine components. This procedure is crucial for maintaining the overall performance and longevity of the engine.

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46.

When operating an engine that is installed on aircraft, position the aircraft so the wind is blowing
- A.
  
  At an unnoticeable level
- B.
  
  Directly into the inlet, within +/- 45 degrees
- C.
  
  At a 90 degree angle to the engine exhaust
- D.
  
  Directly into the exhaust, within +/- 45 degrees
Correct Answer
B. Directly into the inlet, within +/- 45 degrees

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 degrees. This is because the inlet is where the engine draws in air for combustion. By positioning the aircraft in this way, the engine can receive a steady flow of air, which is crucial for proper functioning and optimal performance.

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47.

The term trim means to adjust the engine systems for optimum performance per the limits in the TO. The two methods used to trim an engine are
- A.
  
  Hydraulic and mechanical
- B.
  
  Hydraulic and electrical
- C.
  
  Manual and mechanical
- D.
  
  Manual and electronic
Correct Answer
D. Manual and electronic

Explanation
The term "trim" refers to adjusting the engine systems for optimal performance within the limits specified in the Technical Order (TO). There are two methods used to trim an engine: manual and electronic. The manual method involves making adjustments by hand, while the electronic method uses electronic controls to make the necessary adjustments. Both methods are used to ensure that the engine operates at its best performance level.

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48.

When checking the turbine section, you do not measure
- A.
  
  Fan turbine inlet temperature (FTIT)
- B.
  
  Turbine inlet temperature (TIT)
- C.
  
  Exhaust gas temperature (EGT)
- D.
  
  Intake gas temperature (IGT)
Correct Answer
D. Intake gas temperature (IGT)

Explanation
When checking the turbine section, you do not measure the intake gas temperature (IGT). The turbine section is specifically concerned with the measurement of fan turbine inlet temperature (FTIT), turbine inlet temperature (TIT), and exhaust gas temperature (EGT). Intake gas temperature (IGT) is not a parameter that is typically measured in the turbine section.

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49.

Prior to starting the engine when doing and anti-ice valve operational check on an F-16C/D, place the anti-ice engine switch to
- A.
  
  ON
- B.
  
  OFF
- C.
  
  START
- D.
  
  MANUAL
Correct Answer
B. OFF

Explanation
When doing an anti-ice valve operational check on an F-16C/D, the correct position for the anti-ice engine switch is "OFF". This is because the purpose of the check is to ensure that the anti-ice valve is functioning properly, and by placing the switch in the "OFF" position, it allows for a controlled test of the valve without any anti-ice system activation. Placing the switch in any other position would either activate the anti-ice system or engage the engine start process, which is not necessary for this specific check.

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50.

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?
- A.
  
  Interface operational
- B.
  
  Bleed schedule
- C.
  
  Dry motoring
- D.
  
  Wet motoring
Correct Answer
C. Dry motoring

Explanation
Dry motoring is the correct answer because it refers to the operational check that allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. This check is performed to ensure that the JFS is functioning properly and can start the engine without the need for additional fuel or throttle adjustments.

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Current Version
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Quiz Edited by
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Dec 10, 2012

Quiz Created by
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2A651 Volume 5 Aircraft Troubleshooting

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

If you encounter engine trouble where more than one unit is at fault, you would first

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

To becmoe and expert troubleshooter, you must

What system is used on most modern jet engines to gather and record engine data?

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

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

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

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

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

Most engine monitoring guages and instruments require some type of

Which jet engine temperature is not measured?

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

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

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

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

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

An oil pressure transmitter contains a mechanical section and

The oil pressure indicator receives an electrical signal from the

The two primary units of the tachometer indicating system are the tachometer generator and tachometer

The tachometer indicator is

The frequency of the tachometer generator generator is proportional to the

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

During an operational check of the fire warning system, you press

What is used to indicate the amount of thrust a dual-compressor engine is producing?

The term Pt2 means the

The pressure used in the operation of the engine pressure ratio (EPR) system are the

Inlet pressure (Pt2) is transmitted from its sensing point

While testing an engine on an engine test cell, a breather pressure guage displaying excessively high breather pressure is usually an indication of

The direct oil pressure guage on a test cell is connected to an engine oil pressure line to indicate oil pressure without using wiring, indicator, or

Test cell exhaust gas temperature (EGT) selector allows selection of

The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to divert fuel flow through the

When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per mimnute (RPM) will be within

The test cell integrated circuit (IC) temperature indicator displays temperatures in degress Fahrenheit, with a range of

What type of vibration causes unnecessary engine removals and unwarranted repairs?

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

During vibration analysis, frequency is usually measured in

During vibration analysis, amplitude is measured in mils. One mil is equal to

The two types transducers used to measure vibration are

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

To find the instructions for installing vibration pickups at the test cells, you should check the

When you are using a vibration analyzer, you will be notified when a preset signal has been exceeded by

The filter selector switch on the vibration analyzer is used to

What are used to support the fan and low-pressure turbine?

What procedure is uded to ensure the fan and low-pressure turbine are correctly balanced?

When operating an engine that is installed on aircraft, position the aircraft so the wind is blowing

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

When checking the turbine section, you do not measure

Prior to starting the engine when doing and anti-ice valve operational check on an F-16C/D, place the anti-ice engine switch to

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?