2a676 Vol 1 General Mx And Troubleshooting

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  • 1/54 Questions

    (001) Usually, the most difficult step in trouble shooting is?

    • Technical data analysis
    • Operational checkout
    • System analysis
    • Fault isolation
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About This Quiz


All the aircrafts be in in or out of the air force require electricity to function at optimal condition. An aircraft electrical and environmental systems journey man is expected to repair and maintain electrical components of an aircraft. Take the Vol 1 General Mx and Troubleshooting quiz below to test your knowledge. All the best!

2a676 Vol 1 General Mx And Troubleshooting - Quiz

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  • 2. 

    (001) Load lights can be effective for locating problems with

    • High resistance

    • No resistance

    • High voltage

    • High current

    Correct Answer
    A. High resistance
    Explanation
    Load lights can be effective for locating problems with high resistance because high resistance in a circuit can cause a voltage drop. Load lights are designed to illuminate when voltage is present, and if there is a high resistance in the circuit, the voltage drop across that resistance will cause the load light to dim or not illuminate at all. This can help identify the specific area or component in the circuit where the high resistance is occurring, allowing for troubleshooting and repair.

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  • 3. 

    (001) When you are troubleshootin an aircfraft problem using all the troubleshooting procedures available and you still cannot locate the defective LRU, you should try

    • A slaving procedure

    • An isolating procedure

    • To analyze the problem to a deeper level

    • Researching the problem to a deeper level

    Correct Answer
    A. A slaving procedure
    Explanation
    If all troubleshooting procedures have been exhausted and the defective LRU still cannot be located, a slaving procedure should be tried. Slaving involves connecting a known good LRU in place of the suspected defective one and observing if the problem persists. If the problem disappears, it indicates that the original LRU is indeed defective. This procedure helps in isolating the faulty component and narrowing down the troubleshooting process.

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  • 4. 

    (002) For a braided shield to protect an electrical circuit, what cover range will satisfy most applications?

    • 55% to 65%

    • 65% to 75%

    • 75% to 85%

    • 85% to 95%

    Correct Answer
    A. 85% to 95%
    Explanation
    A braided shield is commonly used to protect electrical circuits from electromagnetic interference. The higher the coverage range of the braided shield, the better the protection it provides. Therefore, a cover range of 85% to 95% would satisfy most applications as it offers a high level of protection against interference.

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  • 5. 

    (002) What AF T.O. outlines repair procedures for aircraft electric and electronic wiring?

    • 0-15-1

    • 1-1a-8

    • 1-1a-14

    • 01-1a-35

    Correct Answer
    A. 1-1a-14
    Explanation
    The correct answer is 1-1a-14. This AF T.O. outlines repair procedures for aircraft electric and electronic wiring.

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  • 6. 

    (002) When soldering a contact to a twisted shield wire, which lead will be visible in the foward inspection window?

    • Ground

    • Signal

    • Test

    • Bus

    Correct Answer
    A. Signal
    Explanation
    When soldering a contact to a twisted shield wire, the lead that will be visible in the forward inspection window is the signal lead. The signal lead carries the electrical signal and is typically the most important lead in a circuit.

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  • 7. 

    (002) When using shrinkable insulation sleeves to cover a soldered contact connection, which type of heatin toolis acceptable for use around fueled aircraft?

    • Oil-free type

    • Pure oxygen type

    • Electric motor type

    • Compressed air/nitrogen type

    Correct Answer
    A. Compressed air/nitrogen type
    Explanation
    The compressed air/nitrogen type of heating tool is acceptable for use around fueled aircraft when using shrinkable insulation sleeves to cover a soldered contact connection. This type of heating tool does not introduce any potential fire hazards or contaminants, making it a safe option for use in aircraft maintenance.

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  • 8. 

    (002) During the repair of a shieled wire harness, what is the percentage of copper foil tape pverlap around the damaged area of the shield?

    • 30

    • 50

    • 70

    • 90

    Correct Answer
    A. 50
    Explanation
    The correct answer is 50 because when repairing a shielded wire harness, it is recommended to have a 50% overlap of copper foil tape around the damaged area of the shield. This overlap helps ensure proper shielding and protection against electromagnetic interference.

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  • 9. 

    (003) Which component generates high level of electrostatic voltage because the voltage is not distibuted over the entire surface of the substance?

    • Semiconductors

    • Conductors

    • Insulators

    • Resistors

    Correct Answer
    A. Insulators
    Explanation
    Insulators generate high levels of electrostatic voltage because the voltage is not distributed over the entire surface of the substance. Unlike conductors, which allow the flow of electricity, insulators have high resistance and do not easily allow the movement of electrons. This causes the voltage to concentrate in specific areas, resulting in a high level of electrostatic voltage. Semiconductors, on the other hand, have properties between conductors and insulators, while resistors are components designed to limit the flow of current in a circuit.

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  • 10. 

    (003) Before you connect any connectors to equipment containing ESDS devices, you must first

    • Ensure you are grounded

    • Align connector pins

    • Install conductive dust cap

    • Equalize electrostatic potentials

    Correct Answer
    A. Equalize electrostatic potentials
    Explanation
    Before connecting any connectors to equipment containing ESDS devices, it is necessary to equalize electrostatic potentials. This ensures that there is no difference in electrical charge between the equipment and the connector, which helps prevent the occurrence of electrostatic discharge (ESD). ESD can cause damage to sensitive electronic components, so equalizing the electrostatic potentials is crucial to protect the equipment from potential harm.

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  • 11. 

    (004) What charecteristics is not a physica; characteristic usedfor identification of coatings on printed circuit board?

    • Hardness

    • Solubility

    • Thickness

    • Permeability

    Correct Answer
    A. Permeability
    Explanation
    Permeability is not a physical characteristic used for the identification of coatings on printed circuit boards. Hardness, solubility, and thickness are commonly used physical characteristics to identify coatings, as they can be measured and quantified. Permeability, on the other hand, refers to the ability of a material to allow the passage of substances through it, such as liquids or gases. While permeability may be relevant in other contexts, it is not typically used as a characteristic for identifying coatings on printed circuit boards.

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  • 12. 

    (004) To prevent overheating of the component and circuit board when you are desoldering the joints on a multilead component you should

    • Remove the soldering iron with in 6 seconds

    • Desloder leads ina clockwise direction

    • Desolder using a random pattern

    • Use newly tinned tip

    Correct Answer
    A. Desolder using a random pattern
    Explanation
    To prevent overheating of the component and circuit board when desoldering the joints on a multilead component, it is recommended to desolder using a random pattern. This means that instead of focusing on one specific lead at a time, you should move the soldering iron tip around and desolder different leads in a non-sequential order. This helps distribute the heat evenly and prevents excessive heat buildup in one area, reducing the risk of overheating the component and circuit board.

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  • 13. 

    (004) When solderin heat sensetive parts, you should always use

    • A heat shunt

    • Mild solvents

    • Thermal parting

    • Unclinched leads

    Correct Answer
    A. A heat shunt
    Explanation
    When soldering heat-sensitive parts, using a heat shunt is recommended. A heat shunt is a device that helps to divert and dissipate excess heat away from the sensitive components, preventing damage or overheating. By using a heat shunt, the heat is evenly distributed and controlled, ensuring that the temperature does not rise to a level that could harm the sensitive parts. This precautionary measure helps to maintain the integrity and functionality of the heat-sensitive components during the soldering process.

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  • 14. 

    (004) To visually inspect a solder connection, you should clean and magnify the connection up to

    • 5x

    • 7x

    • 12x

    • 25x

    Correct Answer
    A. 7x
    Explanation
    To visually inspect a solder connection, it is recommended to clean and magnify the connection up to 7x. This level of magnification allows for a closer examination of the solder joint, making it easier to identify any potential defects or issues. Magnifying the connection at this level ensures a thorough inspection and helps to ensure the quality and reliability of the solder connection.

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  • 15. 

    (005) The CSD is regulated to

    • 2,400RPM

    • 4,200 RPM

    • 24,000 RPM

    • 42,000 RPM

    Correct Answer
    A. 24,000 RPM
    Explanation
    The correct answer is 24,000 RPM. This suggests that the CSD (Constant Speed Drive) is regulated to operate at a speed of 24,000 RPM. The CSD is a device used in aircraft to maintain a constant rotational speed of the generator or hydraulic pump. This speed regulation is important for the proper functioning of the aircraft's systems.

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  • 16. 

    (005) BOth control and protection of the AC power system is provided by the

    • BTR

    • GR

    • ACXTR

    • GCU

    Correct Answer
    A. GCU
    Explanation
    The GCU (Generator Control Unit) is responsible for both controlling and protecting the AC power system. It monitors and regulates the generator's output, ensuring it operates within safe limits. Additionally, it detects any abnormalities or faults in the system and initiates protective measures, such as shutting down the generator or activating backup systems. The GCU plays a crucial role in maintaining the stability and reliability of the AC power system.

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  • 17. 

    (005) Tying the left and the right AC buses us accomplished by energyzing the

    • IDG ACG

    • GCU

    • ACXTR

    • BTR

    Correct Answer
    A. ACXTR
    Explanation
    The correct answer is ACXTR. Tying the left and right AC buses is accomplished by energizing the ACXTR.

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  • 18. 

    (005) The switch in the ESCP that commands the ACXTR is marked

    • AC X TIE

    • DC X TIE

    • EXT PWR

    • APU PWR

    Correct Answer
    A. AC X TIE
    Explanation
    The correct answer is AC X TIE. This switch in the ESCP commands the ACXTR (AC Transfer Bus) which is responsible for transferring electrical power between the two AC buses. The AC X TIE position connects the two AC buses together, allowing power to flow between them. This is important in case one AC bus fails, as it ensures that power is still available to critical systems by transferring it from the functioning AC bus to the failed one.

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  • 19. 

    (005) All four IDG ACGs operate as seperate systems while in

    • Parallel mode

    • Isolated mode

    • Split parallel

    • Split isolated mode

    Correct Answer
    A. Isolated mode
    Explanation
    In isolated mode, all four IDG ACGs operate as separate systems. This means that each IDG ACG functions independently and is not connected or dependent on the other IDG ACGs. In this mode, if one IDG ACG fails or malfunctions, it will not affect the operation of the other IDG ACGs. This provides redundancy and ensures that the electrical power supply remains stable even if one IDG ACG fails.

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  • 20. 

    (005) The system(s) that utilize a BIT system for troubleshooting is/are

    • AC only

    • DC only

    • AC,DC, and External

    • AC and DC only

    Correct Answer
    A. AC,DC, and External
    Explanation
    The systems that utilize a BIT system for troubleshooting are AC, DC, and External. This means that all three types of systems, AC, DC, and External, have the capability to use a Built-In Test (BIT) system for troubleshooting purposes.

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  • 21. 

    (005) In the AC power sytem, the component that provides the BIT circuitry utilized in troubleshooting is the

    • GR

    • BCR

    • APU

    • BPCU

    Correct Answer
    A. BPCU
    Explanation
    The BPCU (Battery Power Control Unit) is the component in the AC power system that provides the BIT (Built-In Test) circuitry used in troubleshooting. The BPCU is responsible for monitoring and controlling the power supply from the battery, and it includes diagnostic features that can help identify and troubleshoot any issues with the power system.

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  • 22. 

    (005) During normal operation, the BIT sytem monitors external and internal performance information

    • Only on demand

    • Intermittently

    • Continously

    • Never

    Correct Answer
    A. Continously
    Explanation
    The given correct answer is "continuously." This means that the BIT system consistently monitors both external and internal performance information during normal operation. It does not wait for a specific request or intermittently check the performance, but rather does it continuously.

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  • 23. 

    (005) BIT fault info is stored in

    • Volatile memory

    • Nonvolatile memory

    • Read-only memory (ROM)

    • Random access memory (RAM)

    Correct Answer
    A. Nonvolatile memory
    Explanation
    BIT fault info is stored in nonvolatile memory. Nonvolatile memory refers to a type of computer memory that retains its stored data even when the power is turned off or lost. This is in contrast to volatile memory, which requires continuous power to retain data. Storing BIT fault info in nonvolatile memory ensures that the information is not lost in case of power failure or system shutdown, allowing for the retrieval and analysis of fault data even after a power interruption.

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  • 24. 

    (005) Automatically initiated BIT checks occur on

    • Inital AC system power up

    • Initial AC system power down

    • First engine shutdown

    • Last engine shutdown

    Correct Answer
    A. First engine shutdown
    Explanation
    Automatically initiated Built-In Test (BIT) checks occur on the first engine shutdown. This means that when the engine is shut down for the first time, the system will automatically perform self-diagnostic tests to check for any faults or malfunctions. These tests are important to ensure the system's functionality and identify any potential issues that may need to be addressed before the next use.

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  • 25. 

    (006) The TRPT output is rated at

    • 200amp,26VDC

    • 200amp,28VDC

    • 160amp,26VDC

    • 200amp,28VDC

    Correct Answer
    A. 200amp,28VDC
    Explanation
    The TRPT output is rated at 200amp, 28VDC. This means that the maximum current that can be delivered by the TRPT is 200 amps, and the voltage at which it operates is 28 volts DC.

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  • 26. 

    (006) The TRPT input is rated at at 115/200 VAC,

    • Single phase, 400hz

    • Single phase, 200hz

    • 3-phase, 400hz

    • 3-phase, 200hz

    Correct Answer
    A. 3-phase, 400hz
    Explanation
    The TRPT input is rated at 115/200 VAC, 3-phase, 400hz. This means that the TRPT input can accept a voltage range of 115/200 VAC and it operates on a 3-phase power system with a frequency of 400hz.

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  • 27. 

    (006) The storage battery's rated capacity in ampere hours is

    • 34

    • 38

    • 36

    • 40

    Correct Answer
    A. 40
    Explanation
    The storage battery's rated capacity in ampere hours is 40. This means that the battery is designed to deliver a current of 40 amperes for one hour. It indicates the amount of charge that the battery can hold and deliver over a specific period of time. A higher rated capacity means that the battery can provide power for a longer duration before needing to be recharged.

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  • 28. 

    (006) The battery's charger's input rating is 115 VAC,

    • Single phase, 200hz

    • Single phase, 400hz

    • 3-phase, 200hz

    • 3-phase, 400hz

    Correct Answer
    A. 3-phase, 400hz
    Explanation
    The battery's charger has an input rating of 3-phase, 400hz. This means that the charger is designed to be powered by a 3-phase electrical system, which is commonly used in industrial and commercial settings. The 400hz frequency indicates that the charger is designed to operate at a higher frequency than the standard 50 or 60hz used in residential systems. This higher frequency is often used in aerospace and military applications, where it allows for more compact and lightweight electrical systems.

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  • 29. 

    (006) The battery chargers will terminate their high-rate charge only  after a full charge is sustained for

    • 1/4 hour

    • 1/2 hour

    • 3/4 hour

    • 1 hour

    Correct Answer
    A. 1 hour
    Explanation
    The battery chargers will terminate their high-rate charge only after a full charge is sustained for 1 hour. This means that the chargers are designed to continue charging the battery at a high rate until it reaches a full charge and maintains that level for a duration of 1 hour. Once the battery has sustained a full charge for this amount of time, the chargers will automatically stop the high-rate charge.

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  • 30. 

    (006) To parallel TRPT 1 and 2, the component that must be energized is the

    • R DCT RPC

    • L DCT RPC

    • DCXT

    • DCTR

    Correct Answer
    A. L DCT RPC
    Explanation
    To parallel TRPT 1 and 2, the component that must be energized is the L DCT RPC.

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  • 31. 

    (006) To place the DC power system in isolated mode, the DCT RPC that must be commanded open is/are

    • L DCT RPC and R DCT RPC

    • L DCT RPC or R DCT RPC

    • L DCT RPC only

    • R DCT RPC only

    Correct Answer
    A. L DCT RPC and R DCT RPC
    Explanation
    To place the DC power system in isolated mode, both the L DCT RPC and R DCT RPC must be commanded open. This means that both the left and right DCT RPCs need to be opened in order to isolate the system.

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  • 32. 

    (007) Providing a current path from AEEPR to the right AC tie bus is accomplished by energizing the

    • GR

    • EPR

    • ACXTR

    • ESCP

    Correct Answer
    A. EPR
    Explanation
    Energizing the EPR (Electro-Pneumatic Relay) provides a current path from AEEPR (Auxiliary Electric Equipment Panel Relay) to the right AC tie bus. The EPR is responsible for controlling the flow of current in the circuit and ensures that the current is directed towards the correct destination. By energizing the EPR, it allows the current to flow from AEEPR to the right AC tie bus, establishing the desired current path.

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  • 33. 

    (007) Control and protection for the APU ACG is provided by the

    • GR

    • GCU

    • ESCP

    • APU/EPCU BPCU

    Correct Answer
    A. APU/EPCU BPCU
    Explanation
    The APU/EPCU BPCU (Auxiliary Power Unit/Engine and Propulsion Control Unit Battery Power Control Unit) provides control and protection for the APU ACG (Auxiliary Power Unit Alternating Current Generator). It is responsible for managing the power supply and ensuring the proper functioning of the APU ACG.

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  • 34. 

    (007) The control power for all the GCU is

    • 6VDC

    • 18VDC

    • 24VDC

    • 28VDC

    Correct Answer
    A. 28VDC
    Explanation
    The control power for all the GCU is 28VDC.

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  • 35. 

    (007) To prevent a loss of power on any GEN BUS, the engines that must be started first are

    • 1 and 2

    • 2 and 3

    • 3 and 4

    • 1 and 4

    Correct Answer
    A. 1 and 2
    Explanation
    To prevent a loss of power on any GEN BUS, the engines that must be started first are 1 and 2. This means that in order to maintain power on the generator bus, both engines 1 and 2 need to be started before the other engines. Starting engines 1 and 2 first ensures that there is a continuous power supply to the generator bus, preventing any potential power loss.

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  • 36. 

    (007) The switch on the ESCP that commands the EPR closed when placed to on is marked

    • AC X TIE

    • DC X TIE

    • EXT PWR

    • APU PWR

    Correct Answer
    A. EXT PWR
    Explanation
    The correct answer is EXT PWR. The switch on the ESCP (Engine Start Control Panel) that commands the EPR (Engine Pressure Ratio) closed when placed to on is marked EXT PWR. This means that when the switch is turned on, the engine will receive power from an external power source.

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  • 37. 

    (008) The rectified DC exciting current for the main generator field in the EG is provided by the

    • Exciter

    • Main generator

    • PMG

    • EGCU

    Correct Answer
    A. Exciter
    Explanation
    The correct answer is "exciter". In an electrical generator, the exciter is responsible for providing the rectified DC exciting current for the main generator field. The exciter is a separate component that is connected to the main generator and its main function is to supply the necessary electrical energy to the field winding, which in turn creates the magnetic field required for generating electricity. Without the exciter, the main generator would not be able to produce power efficiently.

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  • 38. 

    (008) THE EGCU monitors primary bus

    • NO 1

    • NO 2

    • NO 3

    • NO 4

    Correct Answer
    A. NO 2
  • 39. 

    (008) In the Emergency generator system, emergency generator voltage sensing is a function of the

    • AC generator drive

    • EGC

    • EGCU

    • EG

    Correct Answer
    A. EGCU
    Explanation
    In the Emergency generator system, emergency generator voltage sensing is a function of the EGCU. The EGCU stands for Emergency Generator Control Unit, which is responsible for monitoring and controlling the voltage output of the emergency generator. It ensures that the voltage remains within the desired range and provides feedback to the system to make any necessary adjustments. Without the EGCU, the emergency generator may not be able to effectively sense and regulate its voltage output, leading to potential issues or failures in the system.

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  • 40. 

    (008) During a GRT, he type of fault signals sent to the GCU and SIP are

    • Simulated

    • Real-time

    • Bi-polar

    • In-flight

    Correct Answer
    A. Simulated
    Explanation
    During a Ground Readiness Test (GRT), the fault signals sent to the GCU (Ground Control Unit) and SIP (System Interface Panel) are simulated. This means that the signals are artificially generated to mimic the behavior of actual faults that may occur during flight. Simulated fault signals allow for testing and troubleshooting without the need for real-time or in-flight faults, ensuring the safety and effectiveness of the system.

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  • 41. 

    (009) Refer to FOs 3, 3a, 3b, and 3c. You are troubleshooting a malfuntion . All three landing gear do not retract. The most probable cause of the malfunction is the

    • Left MLG WOW relay No. 2

    • Left MLG WOW relay No. 4

    • Right MLG WOW relay No. 2

    • Right MLG WOW relay No. 3

    Correct Answer
    A. Right MLG WOW relay No. 2
    Explanation
    The most probable cause of the malfunction is the right MLG WOW relay No. 2. This is based on the information provided in FOs 3, 3a, 3b, and 3c, which likely indicate that the right MLG WOW relay No. 2 is responsible for the landing gear retraction.

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  • 42. 

    (009) Refer to FOs 3, 3a, 3b, and 3c. You are troubleshooting a malfuntion . the NLG does not extend when 28VDC is not present at pin A of the NLG/Selector Valve, or at pins 19 and 20 og the LDG Test Receptactle. The most probable cause is

    • LDG Control Panel

    • NLG Down limit switch

    • NLG.door selector valve

    • NLG door open limit switch

    Correct Answer
    A. LDG Control Panel
    Explanation
    The most probable cause for the malfunction is the LDG Control Panel. This is because the question states that the NLG does not extend when 28VDC is not present at certain pins, indicating an electrical issue. The LDG Control Panel is responsible for controlling the landing gear system, so if there is a problem with it, it could prevent the NLG from extending properly.

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  • 43. 

    (009) Refer to FOs 3, 3a, 3b, and 3c. You are troubleshooting a malfuntion . The right MLG door does not close when the gear is retracted. You make a check at pin 30 of the LDG Test receptaclle and you find no voltage. You make a voltage check at pin 1 of the LDG Test receptacleand shows 28 VDC. The most probable cause is

    • LDG control pnl

    • Right MLG up limit sw

    • Right MLG door open limit sw

    • Right MLG door closed limit sw

    Correct Answer
    A. Right MLG up limit sw
    Explanation
    The most probable cause for the malfunction is the right MLG up limit switch. This is indicated by the fact that there is no voltage at pin 30 of the LDG Test receptacle, which suggests that the switch is not functioning properly. Additionally, the voltage check at pin 1 of the LDG Test receptacle shows 28 VDC, indicating that the power supply is functioning correctly. Therefore, the right MLG up limit switch is the likely culprit for the door not closing when the gear is retracted.

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  • 44. 

    (009) Refer to FOs 4 and 4a. You are troubleshooting a malfuntion . The nose gear down position light does not illuminate with the gear down and locked. You make an ohms check from pin 81 to gound and read infinity. The malfunction is in the NLG

    • Up limit sw

    • Door closed limit sw

    • Indicator isolation relay

    • Down warning light

    Correct Answer
    A. Indicator isolation relay
    Explanation
    The correct answer is the indicator isolation relay. This is because the question states that the nose gear down position light does not illuminate with the gear down and locked. The indicator isolation relay is responsible for providing power to the nose gear down position light, so if it is malfunctioning, it could explain why the light is not illuminating. The fact that the ohms check from pin 81 to ground reads infinity suggests that there is an issue with the indicator isolation relay.

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  • 45. 

    (009) Refer to FOs 4 and 4a. You are troubleshooting a malfuntion . The left gear down position light does not illuminate with the gear down. In additio, the red light in the gear handle stays on. You make a voltage check on pin 87 of the lights test relay pnl and get 0 volts. You determine 28 VAC is present at pin 41 of the avionics misc modular relay panel no.6; hower , pin 16 has no voltage. The most probable cause of the malfunction is the

    • Avionics misc modular relay pnl no.6

    • Left up limit switch

    • Right jury link gear down limit switch

    • Lights test relay pnl

    Correct Answer
    A. Right jury link gear down limit switch
    Explanation
    The most probable cause of the malfunction is the right jury link gear down limit switch. This is because the left gear down position light does not illuminate and the red light in the gear handle stays on. The voltage check on pin 87 of the lights test relay panel shows 0 volts, indicating a lack of power to the left gear down position light. Additionally, there is no voltage present at pin 16 of the avionics misc modular relay panel, suggesting a problem with the right jury link gear down limit switch.

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  • 46. 

    (009) Refer to FOs 4 and 4a. You are troubleshooting a malfuntion . The red light in the LDG control pnl remains on with the gear down. You make a continuity check from pin 55 and ground on the lights test relay pnl and read infinity. The most probable cause is

    • Avionics misc modular relay pnl no.6

    • NLG down limit sw

    • Right jury link gear down limit switch

    • Lights test relay pnl

    Correct Answer
    A. Lights test relay pnl
    Explanation
    The most probable cause for the red light in the LDG control panel remaining on with the gear down is the lights test relay panel. This is indicated by the continuity check from pin 55 and ground on the lights test relay panel reading infinity, suggesting that there is no connection or continuity in the circuit. Therefore, the lights test relay panel is likely malfunctioning and causing the red light to remain on.

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  • 47. 

    (009) Refer to FOs 4 and 4a. You are troubleshooting a malfuntion . the right gear down position light does not illuminate with the gear down, You make a voltage check at pin 18 of the light tests relay pnl and get no voltage. You make another check at C3 of the right MLG indicator isolation relay and shows 28VAC. The most probable cause of the malfunction is

    • Aircraft wiring

    • The lights test relay pnl

    • The right jury link gear down limit switch

    • Avionics misc modular relay pnl no.6

    Correct Answer
    A. Aircraft wiring
    Explanation
    The most probable cause of the malfunction is aircraft wiring. This is because the voltage check at pin 18 of the light tests relay panel showed no voltage, indicating a potential issue with the wiring. The other options, such as the lights test relay panel or the right jury link gear down limit switch, may also be potential causes, but the lack of voltage suggests that the issue lies with the aircraft wiring.

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  • 48. 

    (010) Refer to fig 2-2. You are troubleshooting a malfunction. the eng b/a sov fails to close. A voltage check at pin 5 of  the sov shows 28 vdc. You make an ohm check from pin 3 of the sov to ground and shows 0 ohms. The most probable cause is the

    • ENG B/A SOV

    • Topping control rheostat

    • B/A control switch

    • ENG Fire Switch

    Correct Answer
    A. ENG B/A SOV
    Explanation
    Based on the given information, the most probable cause for the malfunction is the ENG B/A SOV (Engine Bleed Air Shutoff Valve). The voltage check at pin 5 of the SOV shows 28 VDC, indicating that power is reaching the valve. Additionally, the ohm check from pin 3 of the SOV to ground shows 0 ohms, suggesting a short circuit. This indicates a fault within the SOV itself, rather than the topping control rheostat, B/A control switch, or ENG Fire Switch.

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  • 49. 

    (010) Refer to fig 2-2. You are troubleshooting a malfunction. The crossover valve is stuck open. you make a voltage check at pin B of the crossover valve and it reads 28 VDC. An ohm check from pin C to ground shows infinite ohms. the most probable cause is

    • Open ground

    • Shorted ground

    • Open windings in the crossover valve

    • Shorted windings in the crossover valve

    Correct Answer
    A. Open ground
    Explanation
    Based on the given information, the most probable cause for the malfunction is an open ground. This is indicated by the voltage check at pin B of the crossover valve reading 28 VDC, while the ohm check from pin C to ground shows infinite ohms. An open ground would prevent the proper flow of electrical current, causing the crossover valve to malfunction.

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  • Current Version
  • Jan 25, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 06, 2009
    Quiz Created by
    2.5ace

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