2A654 CDC All UREs
All the UREs of CDC 2A654.
Questions and Answers
- 1.
What type of fuel pumps are used for engine feed in the forward and AFT reservoir tanks of a fighter aircraft?
- A.
Single-impeller, turbine-driven
- B.
Single-impeller, electrically driven
- C.
Dual-impeller, turbine-driven
- D.
Dual-impeller, electrically driven
Correct Answer
D. Dual-impeller, electrically drivenExplanation
Dual-impeller, electrically driven fuel pumps are used for engine feed in the forward and AFT reservoir tanks of a fighter aircraft. These pumps have two impellers that are driven by an electrical motor. This design allows for efficient and reliable fuel delivery to the engine, ensuring optimal performance during flight. The use of electrically driven pumps eliminates the need for a turbine, reducing complexity and maintenance requirements.Rate this question:
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- 2.
What type valve is the crossfeed valve in a fighter aircraft?
- A.
Fuel pressure-operated gate
- B.
Hydraulic-operated gate
- C.
Motor-operated butterfly
- D.
Solenoid-operated butterfly
Correct Answer
A. Fuel pressure-operated gateExplanation
The crossfeed valve in a fighter aircraft is a fuel pressure-operated gate. This means that it is controlled and operated by the fuel pressure in the aircraft's fuel system. This type of valve allows for the transfer of fuel between different fuel tanks in the aircraft, ensuring a balanced fuel distribution and maintaining proper fuel flow during flight.Rate this question:
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- 3.
What position would you place the ENGINE FEED switch in order to correct a fuel imbalance caused by to much fuel in the forward fuel system of a fighter aircraft?
- A.
AFT
- B.
FWD
- C.
BALANCE
- D.
NORMAL
Correct Answer
B. FWDExplanation
To correct a fuel imbalance caused by too much fuel in the forward fuel system of a fighter aircraft, the ENGINE FEED switch should be placed in the FWD position. This would allow the excess fuel to be directed towards the engines, helping to balance the fuel distribution between the forward and aft fuel systems.Rate this question:
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- 4.
What tanks must be operating to use body tank fuel to feed the engines on a tanker aircraft?
- A.
Air refueling
- B.
Alternate
- C.
Main tank
- D.
Override
Correct Answer
A. Air refuelingExplanation
In order to use body tank fuel to feed the engines on a tanker aircraft, air refueling tanks must be operating. Air refueling allows the aircraft to receive fuel from another aircraft while in flight, thereby enabling the transfer of fuel from one aircraft to another. This is crucial for tanker aircraft as they often need to refuel other aircraft during missions. The other options, such as alternate, main tank, and override, do not directly relate to the process of using body tank fuel for engine operation on a tanker aircraft.Rate this question:
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- 5.
What valves must be open to feed all engines from the center wing tank on a tanker aircraft?
- A.
Air refueling to engine manifold
- B.
Gravity feed
- C.
Tank to manifold
- D.
Override wing
Correct Answer
C. Tank to manifoldExplanation
To feed all engines from the center wing tank on a tanker aircraft, the tank to manifold valves must be open. These valves allow fuel to flow from the tank into the manifold, which then distributes the fuel to all the engines. By opening these valves, fuel can be transferred and supplied to all the engines efficiently.Rate this question:
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- 6.
What causes fuel to transfer from the reserve tank on a tanker aircraft during flight?
- A.
Air pressure
- B.
Boost pump pressure
- C.
Gravity
- D.
Override pump pressure
Correct Answer
C. GravityExplanation
Fuel transfers from the reserve tank on a tanker aircraft during flight due to gravity. As the aircraft consumes fuel from the main tank, the reserve tank, which is located at a higher position, allows the fuel to flow downwards and replenish the main tank. This natural flow is facilitated by gravity, which ensures that the fuel transfers from the reserve tank to the main tank without the need for any additional mechanisms or external forces.Rate this question:
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- 7.
Why is the output pressure and the flow ratings of a centrifugal pump greater then the amount the system needs?
- A.
Provide fuel to the engines during negative gravity or inverted flight conditions.
- B.
Prevent reverse flow of fuel from a pump with a greater pressure output.
- C.
Prevent fuel boiling and evaporation in the wing tanks at high altitudes.
- D.
Provide an ample supply of fuel in case of a single pump failure.
Correct Answer
D. Provide an ample supply of fuel in case of a single pump failure.Explanation
The output pressure and flow ratings of a centrifugal pump are greater than the amount the system needs in order to provide an ample supply of fuel in case of a single pump failure. This ensures that even if one pump fails, there is still enough pressure and flow to continue providing fuel to the engines. This redundancy is important for maintaining the operation of the system and preventing any interruptions in fuel supply.Rate this question:
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- 8.
What type of centrifugal pump is used when fuel supply is required during negative gravity conditions?
- A.
In-line ejector
- B.
Dual-impeller
- C.
Rotary-vane
- D.
Top-mounted
Correct Answer
B. Dual-impellerExplanation
A dual-impeller centrifugal pump is used when fuel supply is required during negative gravity conditions. This type of pump is designed with two impellers that work together to provide the necessary pressure and flow to overcome the negative gravity conditions and ensure a continuous fuel supply. The dual impellers allow for increased efficiency and performance in these challenging conditions.Rate this question:
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- 9.
What item prevents foreign objects from holding the bypass valve open in a dual-impeller pump?
- A.
An inlet screen
- B.
An in-line filter
- C.
A one-way check valve
- D.
A two-way check valve
Correct Answer
A. An inlet screenExplanation
An inlet screen is a device that is placed at the intake of a pump to prevent foreign objects from entering and obstructing the pump's operation. It acts as a barrier, allowing only clean water or fluid to pass through while blocking any debris or foreign objects. By preventing these objects from entering the pump, the inlet screen ensures that the bypass valve remains closed and the pump can function properly without any obstructions.Rate this question:
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- 10.
What does the arrow stamped on the body of a check valve indicate?
- A.
Valve installation position to prevent air entrapment
- B.
Location of manufactures data block
- C.
Direction of fuel flow
- D.
Direction of by-pass fuel flow
Correct Answer
C. Direction of fuel flowExplanation
The arrow stamped on the body of a check valve indicates the direction of fuel flow. This arrow serves as a visual indicator to ensure that the valve is installed correctly and allows fuel to flow in the intended direction.Rate this question:
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- 11.
What feature prevents excess pressure from building up in trapped lines or within the body of a sliding gate valve?
- A.
One-way check valves
- B.
Spring-loaded check valves
- C.
Pressure relief valve
- D.
Thermal relief valve
Correct Answer
D. Thermal relief valveExplanation
A thermal relief valve is designed to prevent excess pressure from building up in trapped lines or within the body of a sliding gate valve by releasing the pressure when the temperature exceeds a certain threshold. As the temperature rises, the valve opens to allow the release of excess pressure, thereby preventing damage to the system. This feature is particularly useful in situations where pressure can increase due to thermal expansion, such as in hot water systems or industrial processes.Rate this question:
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- 12.
What type of seal is between the disc and the valve body on a disc-type valve?
- A.
O-ring
- B.
V-ring
- C.
Gasket
- D.
Metal-to-Metal
Correct Answer
A. O-ringExplanation
The correct answer is O-ring. An O-ring is a type of seal commonly used in disc-type valves to prevent leakage between the disc and the valve body. It is a circular rubber or elastomeric ring that is placed in a groove on the valve body. When the valve is closed, the O-ring is compressed between the disc and the valve body, creating a tight seal that prevents fluid or gas from escaping. O-rings are preferred in disc-type valves due to their flexibility, durability, and ability to provide a reliable seal even under high pressure or temperature conditions.Rate this question:
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- 13.
The best method for troubleshooting a fighter engine feed system component you suspect of leaking is to
- A.
Operate the component and check for leaks.
- B.
Pressurize the manifold with air and check for leaks.
- C.
Pressurize the manifold with fuel and check for leaks.
- D.
Stand test with fuel for 30 minutes and listen for leaks.
Correct Answer
C. Pressurize the manifold with fuel and check for leaks.Explanation
The best method for troubleshooting a fighter engine feed system component suspected of leaking is to pressurize the manifold with fuel and check for leaks. This is because the fuel is the substance that the component is designed to handle, so pressurizing the manifold with fuel will simulate the actual operating conditions. By doing so, any leaks in the component can be detected more accurately. Operating the component and checking for leaks may not provide accurate results as the leak may not be noticeable during normal operation. Pressurizing the manifold with air may not accurately simulate the conditions under which the component operates. Standing the test with fuel and listening for leaks may not be as effective in detecting leaks as pressurizing the manifold.Rate this question:
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- 14.
What is first checked when operating a boost pump problem on a fighter aircraft?
- A.
Continuity across the pressure switch
- B.
Direct fuel pressure reading of the pump
- C.
Fuel pressure switch reading
- D.
Power to the boost pump
Correct Answer
B. Direct fuel pressure reading of the pumpExplanation
When operating a boost pump problem on a fighter aircraft, the first thing that is checked is the direct fuel pressure reading of the pump. This is important because it allows the operator to assess the performance and functionality of the boost pump. By checking the fuel pressure directly, any issues or abnormalities can be identified early on and appropriate actions can be taken to address them.Rate this question:
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- 15.
On a tanker aircraft, what prevents the engine from running out of fuel and flaming out if its main tank is hit by small arms fire?
- A.
Automatic fuel monitoring system
- B.
Engine flameout protection device
- C.
Crossfeed system
- D.
Fuel tank and engine sensing device
Correct Answer
C. Crossfeed systemExplanation
The crossfeed system is designed to prevent the engine from running out of fuel and flaming out if the main tank is hit by small arms fire. This system allows fuel to be transferred from one tank to another, ensuring a continuous fuel supply to the engine. By redistributing the fuel, the crossfeed system prevents the engine from starving for fuel and potentially flaming out, thus maintaining the aircraft's engine operation and safety.Rate this question:
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- 16.
You are troubleshooting a malfunction of the crossfeed system on a tanker aircraft when you determine the is no pressure available to route fuel to the crossfeed manifold. The most probable cause of this malfunction is
- A.
A malfunctioning boost pump.
- B.
FOD stuck in a shutoff valve.
- C.
An inoperative pressure transmitter.
- D.
A stuck open check valve.
Correct Answer
A. A malfunctioning boost pump.Explanation
The most probable cause of the malfunction in the crossfeed system is a malfunctioning boost pump. The boost pump is responsible for providing the necessary pressure to route fuel to the crossfeed manifold. If the boost pump is not functioning properly, there will be no pressure available for fuel routing.Rate this question:
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- 17.
What is the most probable cause when a circuit breaker for a shutoff valve continues to "pop?"
- A.
An open in the shut off valve circuit
- B.
A defective circuit breaker
- C.
Too much pressure in the system
- D.
The valve motor has shorted out
Correct Answer
D. The valve motor has shorted outExplanation
When a circuit breaker for a shutoff valve continues to "pop," it means that the circuit breaker is tripping repeatedly. This indicates that there is a fault in the circuit, causing an excessive current flow. One possible cause for this is if the valve motor has shorted out. A short circuit in the motor can cause a sudden surge in current, leading to the circuit breaker tripping to protect the circuit from damage. Therefore, the most probable cause in this scenario is a shorted valve motor.Rate this question:
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- 18.
What is the purpose of the power transfer method of transferring fuel on a fighter jet?
- A.
Pressurize and scavenge the tanks
- B.
Augment fuel transfer and scavenge the tanks
- C.
Pressurize the tanks
- D.
Augment fuel transfer
Correct Answer
B. Augment fuel transfer and scavenge the tanksExplanation
The purpose of the power transfer method of transferring fuel on a fighter jet is to augment fuel transfer and scavenge the tanks. This means that the power transfer method helps to increase the efficiency and speed of fuel transfer between tanks, while also removing any excess or unwanted fuel from the tanks. This is important for maintaining the proper balance and distribution of fuel during flight, ensuring that the fighter jet has a steady and reliable fuel supply.Rate this question:
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- 19.
How many boost pumps are used on a fighter aircraft power transfer system?
- A.
2
- B.
4
- C.
6
- D.
8
Correct Answer
C. 6Explanation
Fighter aircraft power transfer systems typically use six boost pumps. These pumps are responsible for transferring fuel from the aircraft's fuel tanks to the engine. Having multiple boost pumps ensures a continuous and reliable fuel supply, which is crucial for the aircraft's performance and safety during flight.Rate this question:
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- 20.
Which fuel tanks will transfer fuel first in a fighter aircraft?
- A.
External centerline
- B.
Left wing external
- C.
Right wing external
- D.
Left and right wing external
Correct Answer
A. External centerlineExplanation
The external centerline fuel tank in a fighter aircraft is typically designed to be the first tank to transfer fuel. This is because it is strategically located in the centerline position, which allows for better balance and stability of the aircraft during flight. Additionally, transferring fuel from the external centerline tank first helps to maintain the desired center of gravity as the fuel is gradually depleted during the flight.Rate this question:
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- 21.
You are troubleshooting a problem on a fighter aircraft. You find that none of the external tanks transferred fuel with the selection switch in the NORM position; however, the external wing tanks did transfer fuel with the switch in the WING FIRST position. The most probable cause of this malfunction is
- A.
Centerline refuel/transfer valve is inoperative.
- B.
External vent and pressurization valve is bad.
- C.
External transfer shutoff valve is bad.
- D.
Inoperative wing float valve.
Correct Answer
A. Centerline refuel/transfer valve is inoperative.Explanation
The most probable cause of the malfunction is that the centerline refuel/transfer valve is inoperative. This is indicated by the fact that none of the external tanks transferred fuel with the selection switch in the NORM position, but the external wing tanks did transfer fuel with the switch in the WING FIRST position. This suggests that there is an issue specifically with the centerline refuel/transfer valve, which is preventing fuel from being transferred from the external tanks.Rate this question:
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- 22.
How is the fuel level control valve on a cargo aircraft operated and controlled respectively?
- A.
Solenoid/manually
- B.
Hydro mechanically/solenoid
- C.
Fuel pressure/solenoid
- D.
Hydro mechanically/fuel pressure
Correct Answer
B. Hydro mechanically/solenoidExplanation
The fuel level control valve on a cargo aircraft is operated and controlled hydro mechanically, meaning it is controlled by hydraulic pressure. The solenoid is used to activate the hydraulic system, allowing the fuel level control valve to open or close as necessary. This combination of hydro mechanical control and solenoid activation ensures precise and reliable control of the fuel level in the aircraft's tanks.Rate this question:
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- 23.
What cargo aircraft component is designed to sense fuel pressure and transmit a signal to an indicator on the fuel management panel to allow determination of the boost pump output pressure?
- A.
Pressure sensing element
- B.
Pressure transmitter
- C.
Pressure switch
- D.
Pressure gauge
Correct Answer
B. Pressure transmitterExplanation
A pressure transmitter is a component in a cargo aircraft that is specifically designed to sense fuel pressure. It then transmits a signal to an indicator on the fuel management panel, allowing for the determination of the boost pump output pressure. This is important for monitoring and controlling the fuel system to ensure proper fuel flow and pressure levels during flight.Rate this question:
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- 24.
Which indication shows that a boost pump on a cargo aircraft is putting out sufficient pressure?
- A.
PRESS LOW light goes off
- B.
PRESS LOW light illuminates
- C.
Pressure indicator reads 16 psi
- D.
Pressure indicator reads 20 psi
Correct Answer
A. PRESS LOW light goes offExplanation
When the PRESS LOW light goes off, it indicates that the boost pump on the cargo aircraft is putting out sufficient pressure. This means that the pressure is at an acceptable level and there is no need to be concerned about low pressure.Rate this question:
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- 25.
Which kind of fuel valves control the flow of fuel through the jettison system?
- A.
Transfer
- B.
Refuel
- C.
Dump
- D.
Vent
Correct Answer
C. DumpExplanation
Dump valves control the flow of fuel through the jettison system. These valves are responsible for releasing excess fuel from the aircraft's fuel tanks in emergency situations or when the aircraft needs to reduce its weight. Dumping fuel helps to ensure the safety and stability of the aircraft during landing or other critical maneuvers.Rate this question:
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- 26.
What safety feature in the bomber aircraft fuel jettison system prevents the accidental loss of fuel while the aircraft is on the ground?
- A.
The DUMP switch cover is safety-wired closed.
- B.
The DUMP switch is spring loaded to the OFF position.
- C.
The landing gear must be in the airborne position.
- D.
A shorting plug must be connected for the dump valve to open.
Correct Answer
C. The landing gear must be in the airborne position.Explanation
The correct answer is "The landing gear must be in the airborne position." This safety feature ensures that the fuel jettison system is only activated when the aircraft is in the air, preventing accidental loss of fuel while the aircraft is on the ground. This feature is important because jettisoning fuel on the ground can be dangerous and wasteful. By requiring the landing gear to be in the airborne position, the system ensures that the aircraft is in a safe and appropriate condition for fuel jettisoning.Rate this question:
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- 27.
In addition to the dump valve, which valve(s) on a bomber aircraft must be open to allow fuel into the wing transfer lines to be dumped overboard?
- A.
Ballast tank isolation valve
- B.
Forward weapons bay vent disconnect valve
- C.
Ballast tank isolation valve and forward weapons bay vent disconnect valve
- D.
Main pressure actuated vent valve and forward weapons bay vent disconnect valve
Correct Answer
A. Ballast tank isolation valveExplanation
The ballast tank isolation valve must be open in addition to the dump valve in order to allow fuel into the wing transfer lines to be dumped overboard. This valve controls the flow of fuel from the ballast tanks, which are used to maintain the aircraft's balance and stability, into the transfer lines. By opening the ballast tank isolation valve, the fuel can be directed to the dump valve and then expelled from the aircraft.Rate this question:
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- 28.
Which would most likely be used to control the automatic pump shutoff, when all fuel is depleted from a fuel tank?
- A.
Pressure switch
- B.
Toggle switch
- C.
Float switch
- D.
Float valve
Correct Answer
C. Float switchExplanation
A float switch is a device that is commonly used to control the automatic pump shutoff when all fuel is depleted from a fuel tank. It consists of a float that rises and falls with the fuel level, and when the fuel level drops below a certain point, the float switch triggers the pump to shut off. This mechanism ensures that the pump does not continue running when there is no fuel left in the tank, preventing damage to the pump and conserving energy.Rate this question:
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- 29.
Refueling by using the fuel-level control valves is a much safer operation than filler neck refueling because the valves will
- A.
Provide an automatic refueling of a tank to any desired level.
- B.
Automatically stop the flow of fuel into a tank prior to overflow.
- C.
Signal the refueling monitor when to stop the fuel flow.
- D.
Shut down the refueling vehicle if the tanks start to overflow.
Correct Answer
B. Automatically stop the flow of fuel into a tank prior to overflow.Explanation
Refueling by using the fuel-level control valves is safer because these valves are designed to automatically stop the flow of fuel into a tank before it reaches the point of overflow. This helps prevent spills and potential hazards associated with fuel overflow. The other options mentioned, such as automatic refueling to a desired level, signaling the refueling monitor, or shutting down the refueling vehicle in case of overflow, are not mentioned as features of fuel-level control valves and are therefore not relevant to the comparison of safety between the two refueling methods.Rate this question:
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- 30.
What principle is used to control the fuel-level control valve?
- A.
Pneumatic-electrical
- B.
Electrical-mechanical
- C.
Pneumatic-mechanical
- D.
Hydro mechanical
Correct Answer
D. Hydro mechanicalExplanation
The principle used to control the fuel-level control valve is hydro mechanical. This means that the control valve is operated by a combination of hydraulic and mechanical systems. The hydraulic system uses fluid pressure to control the valve, while the mechanical system provides the necessary mechanical force and movement. This combination allows for precise and efficient control of the fuel level.Rate this question:
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- 31.
What part of a piston-type fuel-level control valve prevents fuel from entering the tank?
- A.
A spring
- B.
The float
- C.
A pilot valve
- D.
The diaphragm
Correct Answer
C. A pilot valveExplanation
A pilot valve is a type of valve that controls the flow of fluid in a system. In the case of a piston-type fuel-level control valve, the pilot valve is responsible for preventing fuel from entering the tank. It does this by regulating the opening and closing of the valve, allowing fuel to flow only when necessary and shutting off the flow when the desired fuel level is reached. Therefore, the pilot valve serves as a barrier to prevent fuel from entering the tank when it is not needed.Rate this question:
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- 32.
Approximately how much air space is left at the top of the fuel tanks of a cargo aircraft after ground refueling?
- A.
1%
- B.
3%
- C.
5%
- D.
7%
Correct Answer
B. 3%Explanation
After ground refueling, there is approximately 3% of air space left at the top of the fuel tanks of a cargo aircraft.Rate this question:
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- 33.
Which cargo aircraft components should be operationally checked during the first few minutes of ground refueling?
- A.
Single point receptacle drain pump and valve
- B.
Refueling isolation shutoff valves
- C.
Fuel-level control valves
- D.
Separation shutoff valves
Correct Answer
C. Fuel-level control valvesExplanation
During the first few minutes of ground refueling, it is important to operationally check the fuel-level control valves in the cargo aircraft. These valves are responsible for controlling the fuel levels in the aircraft's tanks. By checking these valves, any potential issues or malfunctions can be identified early on, ensuring that the fuel levels are accurately maintained during the refueling process. This helps to prevent any fuel-related problems or accidents that could occur during the flight.Rate this question:
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- 34.
During refueling on a fighter aircraft, fuel was vented overboard the refueling operation would not stop. The most probable cause of the is an inoperative
- A.
Refuel/transfer float valve
- B.
Refuel shutoff valve
- C.
Selective refueling shutoff valve
- D.
Refuel/transfer control valve
Correct Answer
B. Refuel shutoff valveExplanation
The most probable cause for fuel being vented overboard during refueling on a fighter aircraft is an inoperative refuel shutoff valve. This valve is responsible for stopping the flow of fuel during the refueling process. If it is not functioning properly, it would not be able to shut off the fuel flow, leading to the venting of fuel overboard.Rate this question:
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- 35.
What light on a bomber aircraft aerial refueling system if all conditions are satisfied prior to boom and receptacle connection?
- A.
Amber DISC light
- B.
Blue STATUS light
- C.
Green LATCHED light
- D.
Blue READY/NWS light
Correct Answer
D. Blue READY/NWS lightExplanation
The blue READY/NWS light indicates that all conditions have been met prior to boom and receptacle connection in a bomber aircraft aerial refueling system. This light serves as a signal to the operator that it is safe to proceed with the connection process.Rate this question:
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- 36.
The aerial refueling circuitry on a bomber aerial refueling system is energized by the cam-operated aerial refuel
- A.
Master switch.
- B.
Pressure switch.
- C.
Pull-to-refuel switch.
- D.
Pull-to-refuel-handle.
Correct Answer
C. Pull-to-refuel switch.Explanation
The correct answer is "pull-to-refuel switch." The explanation for this is that the aerial refueling circuitry on a bomber aerial refueling system is energized by the pull-to-refuel switch. This switch is designed to activate the refueling process when pulled, allowing fuel to flow into the aircraft. It is a crucial component in the refueling system, as it controls the flow of fuel and ensures a successful refueling operation.Rate this question:
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- 37.
What action(s) will generate command output signals from the electrical multiplex bus (EMUX) and energize the aerial refuel power supply on a bomber aircraft?
- A.
Pushing up on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
- B.
Pulling down on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
- C.
Pulling down on the PULL REFUEL T-handle.
- D.
Place the MODE switch in the NORM position.
Correct Answer
B. Pulling down on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.Explanation
Pulling down on the PULL REFUEL T-handle and placing the MODE switch in the NORM position will generate command output signals from the electrical multiplex bus (EMUX) and energize the aerial refuel power supply on a bomber aircraft.Rate this question:
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- 38.
Which condition will result in an automatic disconnect of the boom and receptacle during aerial refueling on a bomber aircraft?
- A.
Boom travel limits are exceeded
- B.
Reset trigger on pilot's stick is pressed
- C.
Low pressure condition exists
- D.
Fuel center of gravity is off balance
Correct Answer
A. Boom travel limits are exceededExplanation
If the boom travel limits are exceeded during aerial refueling on a bomber aircraft, it will result in an automatic disconnect of the boom and receptacle. This is because exceeding the travel limits can put excessive stress on the equipment and compromise the safety of the refueling operation. Therefore, the system is designed to automatically disconnect in order to prevent any potential damage or accidents.Rate this question:
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- 39.
A manual disconnect of the tanker and receiver on a bomber aircraft has been accomplished. What action will reset the Universal Aerial Refueling Receptacle Slipway Instillation (UARRSI) and signal amplifier, causing the READY/NWS light to illuminate?
- A.
Cycling the slipway to closed and open.
- B.
Pressing the aerial refueling RESET button.
- C.
Placing the pilot trigger switch to the first detent.
- D.
Placing the MODE switch to the NORM position.
Correct Answer
C. Placing the pilot trigger switch to the first detent.Explanation
Placing the pilot trigger switch to the first detent will reset the Universal Aerial Refueling Receptacle Slipway Installation (UARRSI) and signal amplifier, causing the READY/NWS light to illuminate. This action indicates that the system is ready for aerial refueling operations. Cycling the slipway to closed and open, pressing the aerial refueling RESET button, and placing the MODE switch to the NORM position do not specifically reset the UARRSI and signal amplifier, so they are not the correct actions to cause the READY/NWS light to illuminate.Rate this question:
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- 40.
You are troubleshooting a malfunction in a bomber aerial refueling system. The fault code of the malfunction is 28-25-AM. What does the letter A indicate?
- A.
The faulty component within the system
- B.
Corrective action required to fix the problem
- C.
The faulty system or subsystem
- D.
A fault isolation diagram is provided
Correct Answer
D. A fault isolation diagram is providedExplanation
The letter A in the fault code 28-25-AM indicates that a fault isolation diagram is provided. This diagram is likely to help in identifying and isolating the specific fault within the bomber aerial refueling system. By referring to the diagram, the troubleshooting process can be more efficient and effective, as it provides a visual representation of the system and its components.Rate this question:
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- 41.
You are troubleshooting a problem on a bomber aircraft. At a certain point, the fault isolation diagram requests that you enter a parameter monitor code (PMC). To comply with the request you would enter the code on the
- A.
System status panel in the aft crew station.
- B.
System status panel on the windshield center post.
- C.
CITS control and display panel on the windshield center post.
- D.
CITS control and display panel in the aft crew station.
Correct Answer
D. CITS control and display panel in the aft crew station.Explanation
The correct answer is CITS control and display panel in the aft crew station. This is because the fault isolation diagram specifically requests the entry of a parameter monitor code (PMC), and the CITS control and display panel in the aft crew station is the appropriate location for entering such codes. The system status panel on the windshield center post and the system status panel in the aft crew station do not have the capability to enter PMC codes.Rate this question:
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- 42.
What type displacement jet/ejector pumps are in the tank scavenge system of a cargo aircraft?
- A.
Constant
- B.
Positive
- C.
Variable
- D.
Venturi
Correct Answer
C. VariableExplanation
Variable displacement jet/ejector pumps are used in the tank scavenge system of a cargo aircraft. These pumps have the ability to adjust the amount of fluid they displace, allowing for flexibility in the system. This is important in a tank scavenge system as it allows for efficient removal of fuel or other fluids from the tanks. By varying the displacement, the pumps can adapt to different tank sizes and fluid levels, ensuring effective scavenging of the tanks.Rate this question:
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- 43.
Combined with the ejector pumps, what cargo aircraft components keep the boost pump inlet submerged in fuel at all times?
- A.
Vent box
- B.
Float valve
- C.
Surge box
- D.
Check valve
Correct Answer
C. Surge boxExplanation
The surge box, when combined with the ejector pumps, helps to keep the boost pump inlet submerged in fuel at all times. The surge box acts as a reservoir, ensuring a constant supply of fuel to the boost pump. This prevents any interruption in fuel flow and helps maintain the proper functioning of the aircraft's fuel system. The vent box, float valve, and check valve are not directly involved in keeping the boost pump inlet submerged in fuel.Rate this question:
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- 44.
You can determine whether the tank scavenge system on cargo aircraft is operating properly by checking the
- A.
Fuel quantity indicators
- B.
Sump low lights
- C.
Fuel pressure indicators and the fuel quantity indicators
- D.
Sump low lights and fuel quantity indicators
Correct Answer
D. Sump low lights and fuel quantity indicatorsExplanation
The correct answer is sump low lights and fuel quantity indicators. The scavenge system on a cargo aircraft is responsible for removing excess fuel from the fuel tanks. The sump low lights indicate whether there is an excessive amount of fuel in the sump, which could indicate a problem with the scavenge system. Additionally, the fuel quantity indicators provide information about the amount of fuel in the tanks, allowing you to determine if the scavenge system is properly removing fuel. By checking both the sump low lights and fuel quantity indicators, you can ensure that the tank scavenge system is operating correctly.Rate this question:
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- 45.
On a cargo aircraft, how much fuel must be present in a tank to perform a scavenge system operational check?
- A.
6,000 lbs
- B.
12,000 lbs
- C.
18,000 lbs
- D.
24,000 lbs
Correct Answer
B. 12,000 lbsExplanation
The scavenge system is used to remove fuel from the tanks during flight to prevent fuel imbalance. To perform an operational check, a sufficient amount of fuel must be present in the tank. The correct answer of 12,000 lbs indicates the minimum amount of fuel required for the scavenge system to function properly.Rate this question:
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- 46.
Which situation will cause the tank scavenge system's ejector pumps to not operate at full efficiency?
- A.
Trapped fuel in surge box.
- B.
Boost pump inlet screen clogged.
- C.
Jet pump control inoperative.
- D.
Low boost pump pressure.
Correct Answer
B. Boost pump inlet screen clogged.Explanation
If the boost pump inlet screen is clogged, it will restrict the flow of fuel into the ejector pumps, causing them to not operate at full efficiency. The boost pump is responsible for supplying fuel to the ejector pumps, and if its inlet screen is blocked, it will not be able to deliver the required fuel flow. This will result in reduced efficiency of the ejector pumps, as they will not receive enough fuel to function optimally.Rate this question:
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- 47.
What effect, if any, would a missing flapper valve have on the operation of the tank scavenge system?
- A.
None.
- B.
Undesired fuel would flow into the sump box.
- C.
Fuel would be allowed to flow out of the surge box.
- D.
Fuel would be stuck in the sump box.
Correct Answer
C. Fuel would be allowed to flow out of the surge box.Explanation
If the flapper valve is missing from the tank scavenge system, it would allow fuel to flow out of the surge box. The flapper valve is responsible for regulating the flow of fuel within the system, and without it, there would be no obstruction to prevent fuel from exiting the surge box. This could lead to fuel leakage and potential issues with the operation of the system.Rate this question:
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- 48.
How is fuel drained from the main wing manifold of a cargo aircraft after a defuel operation?
- A.
Rotary vane pump
- B.
Gravity flow
- C.
Poppet drain valve
- D.
Ejector pump
Correct Answer
B. Gravity flowExplanation
After a defuel operation, fuel is drained from the main wing manifold of a cargo aircraft using gravity flow. This means that the fuel is allowed to flow out naturally due to the force of gravity, without the need for any additional pumps or valves. Gravity flow is a common method used in aircraft fuel systems to ensure efficient and safe fuel drainage after operations.Rate this question:
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- 49.
The aerial refueling manifold drain pump on a cargo aircraft is
- A.
A turbine-type pump with positive displacement.
- B.
A rotary-vane type pump with positive displacement.
- C.
Centrifugal-vane type pump with variable displacement.
- D.
Ejector-vane type pump with variable displacement.
Correct Answer
B. A rotary-vane type pump with positive displacement.Explanation
The correct answer is a rotary-vane type pump with positive displacement. This type of pump is commonly used in aircraft for aerial refueling manifold drain systems. The rotary-vane pump operates by using rotating vanes to create a vacuum and draw in fluid, which is then trapped and forced out through the pump's outlet. This design allows for efficient and reliable pumping of fluids, making it suitable for the specific requirements of the aerial refueling manifold drain system on a cargo aircraft.Rate this question:
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- 50.
When troubleshooting a manifold drain system, the best method you can use to determine whether or not a single point receptacle manifold drain shutoff valve has opened is to
- A.
Observe the cannon plug position.
- B.
Observe the manual override lever.
- C.
Listen to the actuator motor for the valve.
- D.
Take a voltage reading at the cannon plug.
Correct Answer
B. Observe the manual override lever.Explanation
To determine whether or not a single point receptacle manifold drain shutoff valve has opened, the best method is to observe the manual override lever. This lever allows manual operation of the valve, so by observing its position, one can determine if the valve is open or closed. The cannon plug position and taking a voltage reading at the cannon plug may not provide direct information about the valve's status. Listening to the actuator motor for the valve may give some indication, but observing the manual override lever is the most reliable method.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Jan 06, 2016Quiz Created by
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