2A656 Aircraft Electrical And Environmental Systems Journeyman Volume 3

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1. The constant speed drive (CSD) that is used to drive a 60/80 kilovolts amperes (kVA) generator has an output of approximately

Explanation

The correct answer is 8,000 rpm. The constant speed drive (CSD) is used to drive a 60/80 kVA generator, which indicates the power output of the generator. Since the CSD is a constant speed drive, it means that it maintains a consistent speed regardless of the load. Therefore, the output of the CSD is approximately 8,000 revolutions per minute (rpm), ensuring a stable power supply from the generator.

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About This Quiz
2A656 Aircraft Electrical And Environmental Systems Journeyman Volume 3 - Quiz

This quiz assesses knowledge in Aircraft Electrical and Environmental Systems, focusing on components like the constant speed drive, load controllers, and generator control units in AC power systems. It is designed for 2A656 Journeyman level training, enhancing both practical skills and theoretical understanding.

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2. If you are troubleshooting the landing gear system and replace a bad indicator, your final step is to

Explanation

After replacing a bad indicator in the landing gear system, the final step is to perform an operational check of the system. This is necessary to ensure that the replacement was successful and that the landing gear system is functioning properly. It allows for any potential malfunctions or discrepancies to be identified and addressed before the aircraft is put back into operation. Taking meter readings, limiting the malfunction, and defining the discrepancy may be steps that are taken earlier in the troubleshooting process, but the operational check is the final step to verify the system's functionality.

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3. Remote terminals in the data bus are designed to

Explanation

Remote terminals in the data bus are designed to transfer data between the aircraft system and the data bus controller (DBC). The data bus is a communication network that allows different systems within the aircraft to exchange information. Remote terminals act as intermediaries between the individual systems and the data bus controller, facilitating the transfer of data. This enables efficient communication and coordination between various aircraft systems, ensuring smooth operation and functionality.

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4. After you release the stick grip trim selector switch, the trim indicator light

Explanation

After releasing the stick grip trim selector switch, the trim indicator light extinguishes. This indicates that the trim adjustment has been completed and the aircraft's control surfaces are now properly trimmed.

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5. Placing the landing gear control handle in the up position provides 28 VDC from the 

Explanation

Placing the landing gear control handle in the up position provides 28 VDC from the essential DC bus. This means that when the landing gear control handle is raised, the essential DC bus supplies the necessary power to operate the landing gear system. The essential DC bus is a critical power source in the aircraft, providing power to essential systems even in emergency situations. Therefore, when the landing gear handle is in the up position, the essential DC bus is the correct power source for the landing gear system.

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6. The three positions for the speedbrake switch are

Explanation

The correct answer is open, hold, and retract. The speedbrake switch has three positions that control the movement of the speedbrake. When the switch is in the open position, the speedbrake is fully extended. In the hold position, the speedbrake remains in its current position. And in the retract position, the speedbrake returns to its stowed position. These three positions allow the pilot to control the deployment and retraction of the speedbrake during different phases of flight.

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7. After replacing the 43 degree position switch on the spreedbrake system, your next and final step is to

Explanation

After replacing the 43 degree position switch on the speedbrake system, the next and final step is to perform an operational check. This is necessary to ensure that the newly replaced switch is functioning correctly and is properly integrated into the speedbrake system. By performing an operational check, any potential issues or malfunctions can be identified and addressed before the system is put back into regular use. This step is crucial in maintaining the safety and efficiency of the speedbrake system.

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8. In a continuous loop fire detector system, the shield of the continuous loop is constructed of

Explanation

INCONEL is the correct answer because it is a high-performance alloy that is commonly used in fire detector systems. It has excellent resistance to high temperatures, corrosion, and oxidation, making it suitable for withstanding the harsh conditions in a continuous loop fire detector system. Soft iron, aluminum, and malleable tin do not possess the same level of durability and resistance, making them less suitable for constructing the shield of the continuous loop.

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9. During which troubleshooting step do you review the Air Force Technical Order (AFTO) form 781A?

Explanation

The Air Force Technical Order (AFTO) form 781A is reviewed during the troubleshooting step of defining the discrepancy. This form provides detailed information about the specific problem or issue that needs to be addressed. By reviewing the AFTO form 781A, technicians can gain a better understanding of the discrepancy and gather necessary information to effectively troubleshoot and resolve the issue.

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10. At what volts alternating current (VAC) range does the generator control unit  in an AC power supply system maintain generator output?

Explanation

The generator control unit in an AC power supply system maintains the generator output at a voltage range of 115 VAC with a tolerance of +/- 2 VAC. This means that the generator control unit ensures that the generator output remains within the range of 113 VAC to 117 VAC. This specific voltage range is important for the proper functioning of the AC power supply system and to ensure that the electrical devices connected to it receive the appropriate voltage for their operation.

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11. The data bus component that coordinates the flow of information on the data bus is the

Explanation

The data bus controller is the component that manages the flow of information on the data bus. It controls the timing and synchronization of data transfers between different devices connected to the bus. It ensures that data is transferred accurately and efficiently, coordinating the communication between the sender and receiver devices. The data bus controller plays a crucial role in maintaining the integrity and reliability of data transmission on the data bus.

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12. The transformer rectifier units in a volts direct current (VDC) power system convert thee-phase 115 volts alternating current (VAC) into

Explanation

The transformer rectifier units in a VDC power system convert three-phase 115 VAC into 26 to 31 VDC.

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13. The VAC power requirement for operation of an AC ignition system is

Explanation

The correct answer is 115 VAC, 400 hertz. This means that the AC ignition system requires an input voltage of 115 volts and a frequency of 400 hertz in order to operate properly. The voltage and frequency specifications are important for ensuring the system functions correctly and efficiently.

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14. For nose landing gear (NLG) weight on wheels relay C to energize, the aircraft has to be 

Explanation

The correct answer is "on the ground with weight on the wheels." This is because the NLG weight on wheels relay C is responsible for detecting if the aircraft is on the ground with weight on its wheels. When this condition is met, the relay is energized, indicating that the NLG is in contact with the ground. This information is crucial for various aircraft systems, such as anti-skid braking and landing gear indication.

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15. Which relay or relays must be energized before the anti-collision light will come on?

Explanation

Before the anti-collision light can come on, both the anti-collision relay and the flasher relay must be energized. The anti-collision relay controls the power supply to the anti-collision light, while the flasher relay controls the flashing function of the light. Therefore, both relays need to be activated in order for the anti-collision light to operate correctly.

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16. Before operating the aileron trim system, you must supply power to

Explanation

Before operating the aileron trim system, you must supply power to both the electrical and hydraulic systems. This is because the aileron trim system requires electrical power to operate the controls and hydraulic power to move the ailerons. Without power in both systems, the aileron trim system will not function properly.

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17. What component in the nose wheel steering system provided a quick disconnect capability for turning the nose wheel beyond the steerable range?

Explanation

The scissors assembly in the nose wheel steering system provides a quick disconnect capability for turning the nose wheel beyond the steerable range. This component allows for easy disengagement and re-engagement of the steering system, enabling the nose wheel to be turned further when necessary.

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18. What happens if the pilot uses the ramp and cargo door switch while the aircraft is in flight?

Explanation

If the pilot uses the ramp and cargo door switch while the aircraft is in flight, the ramp and door will open at the same time. This means that both the ramp and the cargo door will open simultaneously, allowing for the loading or unloading of cargo while the aircraft is still in the air.

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19. Prior to removing any connector plugs in the nose wheel steering system, you must

Explanation

Before removing any connector plugs in the nose wheel steering system, it is necessary to disconnect the power. This is important to ensure safety and prevent any electrical hazards. Disconnecting the power will eliminate the risk of accidental activation of the system while working on it, reducing the chances of injury or damage. It also allows for a controlled environment to analyze any malfunctions or check for continuity in the system. Therefore, disconnecting the power is a crucial step in the process.

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20. Which aircraft interior lights help to reduce the blinding effect of lighting flashes?

Explanation

Flood lights help to reduce the blinding effect of lighting flashes in aircraft interiors. Flood lights are designed to provide a wide and even distribution of light, which helps to minimize the contrast between the bright flashes of lightning and the surrounding cabin environment. This reduces the discomfort and potential temporary blindness that passengers and crew may experience during a lightning strike. Flood lights also ensure that the cabin remains adequately illuminated during the duration of the lightning event, allowing occupants to move around safely.

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21. How does the auxiliary fuel tank indicating system give a no-flow indication?

Explanation

The auxiliary fuel tank indicating system gives a no-flow indication through a flashing amber light. This indicates that there is a problem with the flow of fuel in the auxiliary tank. The flashing light is used to draw attention and signal an issue that needs to be addressed. It serves as a warning to the pilot or operator that there may be a blockage or malfunction in the fuel system, and further investigation or action is required to resolve the issue.

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22. The slotted wing flaps are used on heavy aircraft and

Explanation

The slotted wing flaps are used on heavy aircraft to increase the chamber or curvature of the wing. By extending forward and downward, they form a slot between the flap of the wing. This slot helps to improve the lift characteristics of the wing by allowing air to flow smoothly over the top surface of the wing, reducing turbulence and increasing lift. The slot also lowers the trailing edge of the wing to about 40 degrees below its retracted (UP) position, further enhancing the lift generation capability of the wing.

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23. In an AC power supply system, which component controls load division during parallel generator operation?

Explanation

The load controller is the component that controls load division during parallel generator operation in an AC power supply system. It ensures that the load is evenly distributed among the generators to prevent overloading or underloading. By monitoring the load demand and adjusting the output of each generator, the load controller helps maintain a balanced and stable power supply.

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24. When a wheel stops rotating, a DC voltage is supplied to the Mark II aintiskid system valve driver by the 

Explanation

The correct answer is "locked wheel circuit". When a wheel stops rotating, it indicates that the wheel is locked. In such a situation, the locked wheel circuit supplies a DC voltage to the Mark II antiskid system valve driver. This voltage is used to control the valve and release the brake pressure on the locked wheel, preventing skidding and improving vehicle control.

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25. If the normal battery will not charge but the standby battery is OK, then you start taking meter readings at the

Explanation

If the normal battery will not charge but the standby battery is OK, the problem is likely with the normal battery relay. The normal battery relay is responsible for controlling the charging of the normal battery. If it is faulty or not functioning properly, it would prevent the normal battery from charging even if the standby battery is working fine. Therefore, taking meter readings at the normal battery relay would help identify any issues with it and potentially resolve the charging problem.

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26. The position switch provides voltage to the locked solenoid of the ramp up-lock control valve in the ramp and cargo door system when the

Explanation

The position switch is designed to activate the locked solenoid of the ramp up-lock control valve only when the ramp is in the fully up position. This means that when the ramp reaches its maximum raised position, the position switch will send a voltage signal to the locked solenoid, allowing it to lock the ramp in place. This ensures that the ramp remains securely in the fully up position during operation.

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27. When a pneumatic starter reaches maximum speed, the ground circuit to the starter relay is opened by

Explanation

The centrifugal switch is responsible for opening the ground circuit to the starter relay when a pneumatic starter reaches maximum speed. This switch is designed to activate at a specific rotational speed, allowing it to disconnect the starter relay and prevent further power supply to the starter. This mechanism ensures that the starter does not continue running at high speeds, which could lead to damage or malfunction.

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28. Which component is used as an emergency means of controlling the aileron trim control circuit?

Explanation

The auxiliary trim switch is used as an emergency means of controlling the aileron trim control circuit. This switch is typically located in a convenient location for the pilot to quickly access and operate in case of an emergency or failure of the primary trim control switches. It allows the pilot to manually adjust the aileron trim to maintain proper control and balance of the aircraft.

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29. How many pulses per min does the strobe light power supply provide the trigger voltage to the strobe anti-collision light?

Explanation

The strobe light power supply provides a trigger voltage to the strobe anti-collision light at a rate of 50 to 60 pulses per minute.

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30. Momentarily depressing the horn silence switch for the landing gear warning circuit applies

Explanation

When the horn silence switch for the landing gear warning circuit is momentarily depressed, it provides a ground for the horn silence relay. This means that it completes the electrical circuit and allows current to flow through the relay, activating it. The ground connection is necessary for the relay to function properly and silence the horn.

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31. The output of gallons per min (GPM) of the scavenge pumps is approximately

Explanation

The output of gallons per min (GPM) of the scavenge pumps is approximately 2 gpm. This means that the scavenge pumps are capable of pumping out approximately 2 gallons of fluid per minute.

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32. Frequently used in fire warning systems, the fire detector that has a high-nickel steel rod located along the center line of a stainless steel tube assembly is called

Explanation

An iron fireman switch is frequently used in fire warning systems. It consists of a high-nickel steel rod located along the center line of a stainless steel tube assembly. This switch is designed to detect fire and trigger the necessary actions to control it. It is a reliable and effective component in fire detection systems.

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33. What external power system component disconnects external power from the aircraft?

Explanation

The APU/external power disconnect contactor (AEDC) is the external power system component that disconnects external power from the aircraft.

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34. What is the last thing you must do before completing a troubleshooting cycle?

Explanation

Before completing a troubleshooting cycle, it is essential to perform an operational check. This step ensures that the repaired or replaced item is functioning correctly and meets the required specifications. By conducting an operational check, any potential issues or malfunctions can be identified and resolved before considering the troubleshooting process complete. This final step helps to validate the effectiveness of the troubleshooting efforts and ensures that the problem has been successfully resolved.

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35. What type of fuel system valves link to the left wing and aft body tanks to the right wing, mid body, and forward body tanks?

Explanation

The correct answer is interconnect. Interconnect valves are fuel system valves that link the left wing and aft body tanks to the right wing, mid body, and forward body tanks. These valves allow fuel to flow between the different tanks, ensuring a balanced distribution of fuel throughout the aircraft. This is important for maintaining stability and performance during flight.

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36. How many boost pumps are there in main fuel tank number 1?

Explanation

There are four boost pumps in main fuel tank number 1.

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37. What component in the landing gear system initiate a signal that identifies the landing gear position and any given time?

Explanation

Limit switches are components in the landing gear system that initiate a signal to identify the position of the landing gear at any given time. These switches are designed to detect the physical movement or position of a mechanism and provide feedback to the system. In the case of the landing gear, limit switches are used to determine whether the gear is in the up or down position. When the landing gear reaches its limit, the switch is activated, sending a signal to indicate the gear's position.

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38. The aircraft write up states that the leading edge of the stabilizer does not move down when either horizontal stabilizer trim control switch is put to the NOSE UP position. Where is the best place to start taking meter readings?

Explanation

The correct answer is to check for 28 VDC at pin F of the actuator connector plug with either of the horizontal stabilizer trim control switches actuated. This is the best place to start taking meter readings because it directly tests the voltage at the actuator connector plug, which is where the issue with the stabilizer not moving down is likely to be. The other options either test for voltage at different pins or at the up-limit switch, which may not provide accurate information about the problem at hand.

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39. Amplifiers used in the photoelectric fire detector system are sensitive only to

Explanation

The amplifiers used in the photoelectric fire detector system are sensitive only to signals with a frequency between 7 and 60 Hz. This means that they can detect and amplify signals within this frequency range, while being less sensitive or unresponsive to signals outside of this range. This frequency range is likely chosen because it corresponds to the typical frequency range of fire-related phenomena, such as flickering flames or smoldering fires. By focusing on this specific frequency range, the amplifiers can effectively detect and amplify the signals associated with fire, increasing the sensitivity and accuracy of the fire detection system.

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40. When the stick grip trim selector switch is moved to the left, the position of the aircraft left aileron is

Explanation

When the stick grip trim selector switch is moved to the left, it adjusts the trim of the aircraft's ailerons. Ailerons are control surfaces on the wings that help in rolling the aircraft. Moving the switch to the left indicates a desire to trim the left aileron. In order to trim the left aileron, it needs to be moved in the opposite direction, which means the left wing should be moved down. Therefore, the correct answer is "up (left wing down)."

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41. What is the minimum VAC requirement to energize the emergency power disconnect relay (EPDR)?

Explanation

The minimum VAC requirement to energize the emergency power disconnect relay (EPDR) is 93 VAC from the C phase. This means that in order for the EPDR to be activated, a voltage of at least 93 VAC needs to be present in the C phase.

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42. If the normal battery is supplying DC to the battery bus and emergency DC bus, your first step in troubleshooting is to

Explanation

Knowing the system operation is the first step in troubleshooting when the normal battery is supplying DC to the battery bus and emergency DC bus. Understanding how the system is supposed to work will help identify any deviations or abnormalities that may be causing the issue. By having a clear understanding of the system operation, it becomes easier to pinpoint the problem and determine the appropriate course of action to resolve it.

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43. To begin troubleshooting a fuel pump inoperative writeup; you would know the system, and then

Explanation

Performing an operational check is the first step in troubleshooting a fuel pump inoperative writeup. This involves testing the fuel pump to see if it is functioning properly. By performing this check, you can determine if the fuel pump is the cause of the issue or if there is another problem within the system. Once the operational check is completed, further steps can be taken to limit the malfunction or replace the fuel pump if necessary.

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44. Thermal switches in a fire warning system are normally connected in

Explanation

Thermal switches in a fire warning system are connected in parallel with each other to ensure that if one switch is triggered, it does not affect the operation of the others. However, they are also connected in series with the warning light to ensure that if any of the switches are triggered, the warning light will be activated. This configuration allows for redundancy in the system and ensures that a fire can be detected and indicated even if one or more switches fail to activate.

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45. In the DC power supply system, the reverse current relays (RCR) deenergize when the potential at the

Explanation

The reverse current relays (RCR) in the DC power supply system deenergize when the potential at the GEN terminal is less than the battery terminal. This means that the voltage at the GEN terminal is lower than the voltage at the battery terminal, indicating a reverse current flow. When this occurs, the RCRs are designed to deenergize in order to protect the system from any potential damage or malfunction caused by the reverse current.

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46. For the master caution lamp in the master caution system to illuminate,

Explanation

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47. Where should you first take ohmmeter readings if the nosewheel steering (NWS) fail light illuminates?

Explanation

If the nosewheel steering (NWS) fail light illuminates, the first place to take ohmmeter readings should be at the command and feedback potentiometer. This is because the potentiometer is responsible for providing the input and feedback signals for the nosewheel steering system. By measuring the resistance using an ohmmeter, any discrepancies or faults in the potentiometer can be identified, which could be causing the NWS fail light to illuminate.

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48. The maximum circuit resistance within a thermocouple circuit is

Explanation

The maximum circuit resistance within a thermocouple circuit is 5 ohms. This is because a thermocouple generates a voltage based on the temperature difference between its two junctions. To accurately measure this voltage, the circuit resistance should be as low as possible to minimize any voltage drops across the circuit. A higher circuit resistance would result in a larger voltage drop, leading to inaccurate temperature measurements. Therefore, a maximum circuit resistance of 5 ohms is recommended for thermocouple circuits.

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49. When the cargo and personnel doors close and lock, the door-

Explanation

When the cargo and personnel doors close and lock, the open relay will de-energize. This means that power supply to the open relay will be cut off, causing it to deactivate.

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50. The auxiliary source selected to power the tie bus in the APU is determined by the

Explanation

The correct answer is APU/external power contactor (AEPC). The AEPC is responsible for selecting the auxiliary power unit (APU) or external power as the source to power the tie bus. The tie bus is a common electrical bus that connects different power sources and distributes power to various systems in an aircraft. The AEPC ensures that the appropriate power source is selected based on the operational requirements and availability of the APU and external power.

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51. Which flight control system operates the disconnect clutch in the stabilized trim actuator assembly?

Explanation

The manual system operates the disconnect clutch in the stabilized trim actuator assembly. This means that the pilot can manually disconnect the clutch to override the system and make adjustments to the trim. The manual system provides a backup option in case the other systems fail or need to be overridden for any reason.

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52. Which emergency AC power system component prevents the emergency generator from dropping off-line when the aircraft lands?

Explanation

The emergency power interlock relay (EPIR) is the component that prevents the emergency generator from dropping off-line when the aircraft lands. This relay ensures that the emergency power supply remains connected and operational even during landing, providing continuous power in case of any power failures or emergencies. It acts as a safety measure to ensure that the emergency power system remains active and reliable during critical phases of flight, such as landing.

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53. The direct currect (DC) voltage that is supplied to the lights in a photoelectric circuit is pulsed at a rate of

Explanation

The correct answer is 10 Hz because in a photoelectric circuit, the direct current (DC) voltage supplied to the lights is pulsed at a rate of 10 Hz. This means that the voltage is being turned on and off 10 times per second. This pulsing of the voltage allows for precise control over the lights and can be used for various applications such as dimming or flashing effects.

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54. In the direct current (DC) power supply system, the delta-wound secondaries of the internal transformer in the transformer rectifier (TR) unit are used to provide a more stable 

Explanation

The delta-wound secondaries of the internal transformer in the transformer rectifier (TR) unit are used to provide a more stable current output. This is because the delta configuration allows for better current regulation and reduces the effects of load fluctuations. By having a stable current output, the DC power supply system can ensure consistent and reliable power to the connected devices or equipment.

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55. What type of power is stepped up by the strobe light power supply provide to act as the trigger voltage for the strobe anti-collision lights?

Explanation

The strobe light power supply steps up the voltage to 28 VDC in order to act as the trigger voltage for the strobe anti-collision lights. This means that the power supply increases the voltage from its input level to 28 volts of direct current, which is then used to activate the strobe lights.

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56. When the cargo ramp moves to the fully closed position, the

Explanation

When the cargo ramp moves to the fully closed position, the position switches close. This means that the switches, which are likely located on the cargo ramp, are activated or closed when the ramp is fully closed. This could be a safety measure to ensure that the ramp is securely closed before other actions or operations can take place.

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57. When the nosewheel steering shutoff valve is energized, hydraulic pressure is applied to the

Explanation

When the nosewheel steering shutoff valve is energized, hydraulic pressure is applied to the right and left solenoid control valve. This means that the solenoid control valve receives hydraulic pressure, which allows it to control the steering of the nosewheel. The solenoid control valve is responsible for directing the flow of hydraulic fluid to the steering actuator, which in turn moves the nosewheel in the desired direction. The steering control box and command potentiometer are not directly affected by the energized shutoff valve.

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58. The engine ignition circuit for the B model of C-135 aircraft does not contain

Explanation

The engine ignition circuit for the B model of C-135 aircraft does not contain a throttle switch. The throttle switch is responsible for controlling the flow of fuel and air mixture to the engine, but in this particular model, it is not included in the ignition circuit. The ignition circuit consists of two ignition units, two spark igniters, and an ignition control-and-start switch, which are all essential components for starting and operating the engine.

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59. When you achieve maximum aileron travel, you should see the aileron takeoff trim indicator lights

Explanation

When you achieve maximum aileron travel, the aileron takeoff trim indicator lights should flash. This indicates that the ailerons have reached their maximum deflection and are functioning properly. The flashing of the lights is a visual indication for the pilot that the ailerons are in the correct position for takeoff.

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60. When all systems are configured for flight, the pilot or copilot must press the

Explanation

The hydraulic pitch trim levers are the correct answer because when all systems are configured for flight, the pilot or copilot must press these levers to adjust the pitch trim of the aircraft. This helps in maintaining the desired pitch attitude and stability during flight. The aileron roll trim lever is used to adjust the roll trim, the autopilot engage lever is used to engage the autopilot system, and the thrust reverser locked lever is used to lock the thrust reverser during landing. However, in this scenario, it is specifically mentioned that the correct action to be taken is related to the hydraulic pitch trim levers.

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61. The under voltage activation point for the main generator in a volts alternating current (VAC) power supply system is

Explanation

The under voltage activation point for the main generator in a VAC power supply system is 103 [+/-3] VAC. This means that when the voltage drops below 103 VAC, the main generator will be activated to provide power. The +/-3 indicates a tolerance range, so the activation point can be anywhere between 100 VAC and 106 VAC. This ensures that the generator is not activated unnecessarily due to minor voltage fluctuations, but is triggered when there is a significant drop in voltage.

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62. The operation of the air compressor in an engine fuel-air starter system is controlled by

Explanation

The operation of the air compressor in an engine fuel-air starter system is controlled by a pressure switch. This switch is responsible for monitoring the pressure levels in the system and activating the air compressor when the pressure falls below a certain threshold. Once the pressure reaches the desired level, the pressure switch will deactivate the compressor. This ensures that the engine fuel-air mixture is properly pressurized for efficient starting. The pressure switch eliminates the need for manual control by the ground crew or the pilot, making the system more automated and reliable.

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63. While troubleshooting an inoperative taxi light in the aircraft lighting system, if you find 28 VAC on terminal A2 of the taxi light relay your next check point would usually be at the

Explanation

If you find 28 VAC on terminal A2 of the taxi light relay, the next checkpoint would usually be at the lamp terminals to ground. This is because the voltage reading indicates that power is reaching the relay, but the issue may lie in the connection between the relay and the lamp. By checking the lamp terminals to ground, you can determine if there is a faulty connection or a problem with the lamp itself.

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64. Once the voltage goes through the transformer in the direct current ignition system, it is then applied to the

Explanation

In a direct current ignition system, the voltage is first passed through the transformer. After going through the transformer, the voltage is then applied to the igniter plug. The igniter plug is responsible for creating a spark that ignites the fuel-air mixture in the combustion chamber of an engine. Therefore, it makes sense that the correct answer is the igniter plug.

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65. You determine the bulbs are good and the circuit breakers are working for a typical take-off warning system problem:you then check for 28 volts direct current (VDC) at the sockets of the take-off lights and you do not find voltage. Where is the next place you should check?

Explanation

The next place to check would be the spoiler controls take-off warning relay contacts. If there is no voltage at the sockets of the take-off lights, it suggests that there may be an issue with the relay contacts that control the take-off warning system. By checking the spoiler controls take-off warning relay contacts, you can determine if there is a problem with the relay that is preventing the voltage from reaching the sockets.

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66. The 28 volts direct current (VDC) from main DC bus No. 1 to the rudder pedal nose steering select valve coil is controlled by the

Explanation

The rudder pedal steering control relay is responsible for controlling the 28 volts direct current (VDC) from main DC bus No. 1 to the rudder pedal nose steering select valve coil. It acts as a switch, allowing the current to flow to the coil when the relay is activated. This relay is specifically designed to control the steering of the rudder pedal, ensuring that it operates smoothly and efficiently.

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67. When a fault occurs, the individual caution lamps n the master caution system remains on until

Explanation

The individual caution lamps in the master caution system remain on until the reset circuit is energized. This means that once a fault occurs, the caution lamps will continue to stay on until the reset circuit is activated. This allows for the fault to be acknowledged and cleared before the caution lamps can be reset and turned off.

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68. Which ramp and cargo door system component complete the circuit to the ramp control valve?

Explanation

The locking cylinder unlock switch completes the circuit to the ramp control valve. This switch is responsible for unlocking the locking cylinder, allowing the ramp and cargo door system to operate. Without the unlocking of the locking cylinder, the ramp control valve would not receive the necessary signal to function properly. Therefore, the locking cylinder unlock switch is an essential component in completing the circuit and ensuring the proper operation of the ramp and cargo door system.

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69. Which emergency AC power system component connects the output of the emergency generator to the essential bus?

Explanation

The emergency power disconnect relay (EPDR) is the component that connects the output of the emergency generator to the essential bus. This relay is responsible for ensuring a seamless transfer of power from the generator to the essential bus in case of a power failure. It acts as a switch that disconnects the normal power source and connects the emergency generator to the essential bus, providing uninterrupted power supply during emergencies.

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70. The gas turbine compressor (GTC) is stopped manually by turning the control switch to OFF or by puling the GTC fire emergency handle and causing the

Explanation

The correct answer is "fuel control relay to deengergize". When the gas turbine compressor (GTC) is manually stopped, the fuel control relay is deenergized. This means that the power supply to the fuel control relay is cut off, causing it to stop functioning. As a result, the flow of fuel to the GTC is interrupted, leading to the shutdown of the GTC.

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71. What relays connect the auxiliary power source to the aircraft buses?

Explanation

The bus tie connector (BTC) is responsible for connecting the auxiliary power source to the aircraft buses. It serves as a relay that allows power to flow between different electrical buses in the aircraft. By connecting the auxiliary power source to the buses, the BTC ensures that power is distributed properly throughout the aircraft's electrical system.

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72. In an AC power supply system, what component connects the 115/200 VAC main generator output to the main power buses?

Explanation

The generator line contactor (GLC) is the component that connects the 115/200 VAC main generator output to the main power buses in an AC power supply system. This contactor is responsible for controlling the flow of electrical power from the generator to the buses, allowing the generated power to be distributed and utilized throughout the system.

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  • May 27, 2015
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    Mirand Rudd
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