Volume 2 Unit Review Exercises Aircraft Fuel System
Try your hand at another one of our many aircraft unit review exercises, as we put you to the test against a series of questions regarding Aircraft Fuel Systems. How do they work? You tell us!
- 1.
1. (201) What type of pumps is used for engine feed in the FWD and AFT reservoir tanks of a fighter aircraft?
- A.
Dual-impeller, turbine-driven.
- B.
Single-impeller, turbine-driven.
- C.
Dual-impeller, electrically driven.
- D.
Single-impeller, electrically driven
Correct Answer
C. Dual-impeller, electrically driven. -
- 2.
2. (201) The crossfeed valve on a fighter aircraft is a
- A.
Cable-operated gate valve.
- B.
Motor-operated butterfly valve.
- C.
Fuel pressure-operated gate valve
- D.
Solenoid-operated butterfly valve
Correct Answer
C. Fuel pressure-operated gate valveExplanation
The crossfeed valve on a fighter aircraft is a fuel pressure-operated gate valve. This means that it is controlled by the fuel pressure in the aircraft's fuel system. When the fuel pressure reaches a certain level, it opens the valve to allow fuel to flow from one fuel tank to another. This type of valve is commonly used in aircraft fuel systems to ensure proper fuel distribution and balance during flight.Rate this question:
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- 3.
3. (201) On a fighter aircraft fuel system, a thermally-actuated valve in the heat exchanger outlet prevents fuel from exceeding
- A.
140ºF
- B.
160ºF.
- C.
180ºF
- D.
200ºF
Correct Answer
D. 200ºFExplanation
The thermally-actuated valve in the heat exchanger outlet on a fighter aircraft fuel system is designed to prevent the fuel from exceeding a certain temperature. In this case, the correct answer is 200ºF. This means that the valve will close and restrict the flow of fuel if the temperature reaches or exceeds 200ºF, ensuring that the fuel does not become too hot and potentially cause damage or malfunction to the aircraft.Rate this question:
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- 4.
4. (202) To use body tank fuel to feed the engines on a tanker aircraft, the
- A.
Air refueling pumps must be operated.
- B.
Main tank pumps must be operated.
- C.
Alternate pumps must be operated
- D.
Override pumps must be operated
Correct Answer
A. Air refueling pumps must be operated.Explanation
In order to use body tank fuel to feed the engines on a tanker aircraft, the air refueling pumps must be operated. This is because the body tank fuel is typically used for air refueling operations, where fuel is transferred from the tanker aircraft to other aircraft in mid-air. Therefore, the air refueling pumps need to be operational to facilitate this process and transfer the fuel from the body tank to the engines of the tanker aircraft.Rate this question:
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- 5.
5. (202) To feed all engines from the center wing tank on a tanker aircraft, the
- A.
Gravity feed valve must be opened.
- B.
Override wing valves must be opened.
- C.
Tank to manifold valves must be opened
- D.
Air refueling to engine manifold valves must be opened
Correct Answer
C. Tank to manifold valves must be openedExplanation
To feed all engines from the center wing tank on a tanker aircraft, the tank to manifold valves must be opened. This is because the tank to manifold valves control the flow of fuel from the center wing tank to the engine manifold, which distributes the fuel to all the engines. By opening these valves, the fuel can flow from the tank to the manifold and then to the engines, allowing all engines to be fed from the center wing tank.Rate this question:
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- 6.
6. (203) The output pressure and the flow ratings of a centrifugal pump are greater than the amount the system needs in order to
- A.
Provide an ample supply of fuel in case of a single pump failure.
- B.
Prevent fuel boiling and evaporation in the wing tanks at high altitudes.
- C.
Provide fuel to the engines during negative Gs or inverted flight conditions.
- D.
Prevent the reverse flow of fuel from a pump with a greater pressure output.
Correct Answer
A. Provide an ample supply of fuel in case of a single pump failure.Explanation
The output pressure and flow ratings of a centrifugal pump being greater than the system needs would ensure that there is enough fuel supply in case of a single pump failure. This means that even if one pump fails, the remaining pump(s) would still be able to provide an ample supply of fuel to the system, preventing any disruption in fuel flow and ensuring the continuous operation of the engines.Rate this question:
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- 7.
7. (203) When fuel supply is required during negative gravity conditions,
- A.
A rotary-vane centrifugal pump is used.
- B.
A dual-impeller centrifugal pump is used.
- C.
An in-line ejector centrifugal pump is used.
- D.
A top-mounted pump centrifugal pump is used.
Correct Answer
B. A dual-impeller centrifugal pump is used.Explanation
During negative gravity conditions, a dual-impeller centrifugal pump is used for fuel supply. This type of pump is specifically designed to operate in low-pressure and low-gravity environments. The dual-impeller design allows for increased efficiency and improved performance, ensuring that fuel is effectively pumped even in these challenging conditions.Rate this question:
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- 8.
8. (203) What feature prevents foreign objects from holding the bypass valve open in a dual-impeller pump?
- A.
A two-way check valve.
- B.
A one-way check valve.
- C.
An impeller screen.
- D.
An inlet screen.
Correct Answer
D. An inlet screen.Explanation
An inlet screen prevents foreign objects from holding the bypass valve open in a dual-impeller pump. This screen acts as a filter, allowing only clean fluid to enter the pump and preventing any debris or foreign objects from entering and interfering with the operation of the bypass valve.Rate this question:
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- 9.
9. (203) Which of the following is not an advantage of the quick change electrically drive fuel pump?
- A.
Requires special tools to install.
- B.
It isn’t possible to install the wrong pump.
- C.
Shortens the time required for pump changes.
- D.
Does not require either physically entering or completely defueling the tank.
Correct Answer
A. Requires special tools to install.Explanation
The correct answer is "Requires special tools to install." This means that one disadvantage of the quick change electrically drive fuel pump is that it requires special tools to install. This implies that the installation process may be more complicated and require additional resources or expertise. The other options listed are advantages of the quick change electrically drive fuel pump, such as not being able to install the wrong pump, shortening the time required for pump changes, and not requiring physically entering or completely defueling the tank.Rate this question:
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- 10.
10. (204) The arrow stamped on the body of a check valve indicates the
- A.
Direction of fuel flow.
- B.
Direction of restricted flow.
- C.
Location of the drilled hole in the valve.
- D.
Location of the manufacturer’s data block.
Correct Answer
A. Direction of fuel flow.Explanation
The arrow stamped on the body of a check valve indicates the direction of fuel flow. This is important because check valves are designed to allow fluid to flow in only one direction, preventing backflow. The arrow serves as a visual indicator for the correct orientation of the valve to ensure proper fuel flow.Rate this question:
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- 11.
11. (204) The flapper on a flapper-type check valve is opened by
- A.
Spring pressure.
- B.
Hydromechanical action.
- C.
Gravity flow or pump pressure.
- D.
An electrical impulse to the flapper mechanism.
Correct Answer
C. Gravity flow or pump pressure.Explanation
The flapper on a flapper-type check valve is opened by gravity flow or pump pressure. This means that when there is sufficient flow or pressure from either gravity or a pump, the flapper will be forced open, allowing fluid to pass through the valve. The other options, such as spring pressure, hydromechanical action, or an electrical impulse, are not correct because they do not describe the mechanism by which the flapper is opened in a flapper-type check valve.Rate this question:
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- 12.
12. (204) What shutoff valve cannot withstand extreme pressures?
- A.
Disc.
- B.
Butterfly.
- C.
Sliding gate.
- D.
Rotary plug.
Correct Answer
C. Sliding gate.Explanation
A sliding gate shutoff valve is not designed to withstand extreme pressures. This type of valve operates by sliding a gate across the flow path to control the flow of fluid. However, the sliding gate design may not be able to handle high pressures effectively, as it may cause the gate to become stuck or damaged. In contrast, disc, butterfly, and rotary plug valves are better suited for handling extreme pressures due to their different designs and mechanisms.Rate this question:
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- 13.
13. (204) What feature prevents excessive pressure from building up in trapped lines or within the body of a sliding gate valve?
- A.
Pressure relief valves
- B.
Thermal relief valves.
- C.
One-way check valves.
- D.
Spring-loaded check valves.
Correct Answer
B. Thermal relief valves.Explanation
Thermal relief valves are designed to prevent excessive pressure from building up in trapped lines or within the body of a sliding gate valve. These valves are specifically designed to open and release pressure when the temperature of the fluid exceeds a certain threshold, preventing damage or failure of the equipment. This feature is important in maintaining the integrity and safety of the system.Rate this question:
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- 14.
14. (204) What type of seal is found between the disc and valve body on a disc-type valve?
- A.
V-ring.
- B.
O-ring
- C.
Gasket.
- D.
Metal-to-metal
Correct Answer
B. O-ringExplanation
An O-ring is a type of seal that is commonly used between the disc and valve body on a disc-type valve. O-rings are made of rubber or elastomer material and are designed to create a tight and reliable seal between two mating surfaces. They are easy to install and provide excellent sealing properties, preventing any leakage or loss of fluid or gas. O-rings are widely used in various industries due to their versatility, durability, and cost-effectiveness.Rate this question:
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- 15.
15. (205) The best method for troubleshooting a fighter engine feed system component you suspect of leaking is to
- A.
Operate the component while looking for leaks.
- B.
Pressurize the manifold with fuel and look for leaks
- C.
Stand-test with fuel for 30 minutes and look for leaks
- D.
Pressurize the manifold with air and listen for leaks.
Correct Answer
B. Pressurize the manifold with fuel and look for leaksExplanation
To troubleshoot a fighter engine feed system component suspected of leaking, the best method is to pressurize the manifold with fuel and look for leaks. This method allows for a direct examination of the component under operating conditions, ensuring that any leaks can be easily identified. By pressurizing the manifold with fuel, any leaks will be visible and can be promptly addressed. This method is more effective than simply operating the component or pressurizing with air, as it specifically targets the fuel system and allows for a thorough inspection.Rate this question:
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- 16.
16. (205) You are troubleshooting a boost pump problem on a fighter aircraft. To do this properly, your first step is to check for
- A.
Power to the boost pump.
- B.
A pressure switch reading
- C.
Continuity of the pressure switch.
- D.
A direct pressure reading of the pump.
Correct Answer
D. A direct pressure reading of the pump.Explanation
To troubleshoot a boost pump problem on a fighter aircraft, the first step is to check for a direct pressure reading of the pump. This is important because it allows you to determine if the pump is functioning properly and providing the necessary pressure. By checking the pressure directly, you can identify any issues with the pump that may be causing the problem. This step is crucial in the troubleshooting process as it helps to narrow down the possible causes of the boost pump problem.Rate this question:
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- 17.
17. (206) On a tanker aircraft, where must fuel be routed in order to feed any engine from any main tank?
- A.
Forward body tank.
- B.
Crossfeed manifold.
- C.
Transfer manifold.
- D.
Center wing tank.
Correct Answer
B. Crossfeed manifold.Explanation
Fuel must be routed through the crossfeed manifold in order to feed any engine from any main tank on a tanker aircraft. The crossfeed manifold allows fuel to be transferred between the main tanks and ensures that fuel is available to all engines regardless of the tank from which it is being drawn. This system provides flexibility and redundancy in fuel supply, allowing for efficient operation of the aircraft.Rate this question:
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- 18.
18. (207) You are troubleshooting a malfunction of the crossfeed system on a tanker aircraft when you determine there is no pressure available to route fuel to the crossfeed manifold. The most probable cause of this malfunction is
- A.
A stuck open check valve.
- B.
A malfunctioning boost pump.
- C.
An inoperative pressure transmitter
- D.
Foreign object damage stuck in a shutoff valve.
Correct Answer
B. A malfunctioning boost pump.Explanation
A malfunctioning boost pump is the most probable cause of the malfunction because a 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 to route the fuel, leading to the observed malfunction.Rate this question:
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- 19.
19. (208) The purpose of the power transfer method on a fighter aircraft is to
- A.
Pressurize the tanks only.
- B.
Augment fuel transfer only.
- C.
Pressurize and scavenge the tanks.
- D.
Augment fuel transfer and scavenge the tanks
Correct Answer
D. Augment fuel transfer and scavenge the tanksExplanation
The power transfer method on a fighter aircraft serves the purpose of both augmenting fuel transfer and scavenging the tanks. This means that it helps to increase the rate at which fuel is transferred from one tank to another, while also removing any excess fuel or air from the tanks. This ensures that the aircraft has a steady and efficient fuel supply during flight, allowing for optimal performance and extended range.Rate this question:
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- 20.
20. (208) How many pumps are used in the power transfer system on a fighter aircraft?
- A.
Two.
- B.
Three.
- C.
Four
- D.
Six.
Correct Answer
D. Six. -
- 21.
21. (208) On a fighter aircraft, what type of pumps are the scavenge pumps and where are they located?
- A.
Ejector-type; located in the F–2 tank
- B.
Turbine-type; located in the F–2 tank.
- C.
Ejector-type; located in the F–1 tank.
- D.
Turbine-type; located in the F–1 tank.
Correct Answer
A. Ejector-type; located in the F–2 tankExplanation
The scavenge pumps on a fighter aircraft are ejector-type pumps. They are located in the F-2 tank.Rate this question:
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- 22.
22. (208) On a fighter aircraft,
- A.
The external centerline tank will transfer first.
- B.
The left wing external tank will transfer first.
- C.
The right wing external tank will transfer first.
- D.
Both wing external tanks will transfer first.
Correct Answer
A. The external centerline tank will transfer first.Explanation
The correct answer is that the external centerline tank will transfer first. This means that when fuel is being transferred from the external tanks of a fighter aircraft, the centerline tank will be the first one to empty its contents. This is likely because the centerline tank is positioned in the middle of the aircraft, making it more accessible for fuel transfer. Additionally, transferring fuel from the centerline tank first helps to maintain the balance and stability of the aircraft during flight.Rate this question:
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- 23.
23. (209) You are troubleshooting a problem on a fighter aircraft. You find that none of the external tanks transferred fuel with the select switch in NORM position; however, the external wing tanks did transfer fuel with the select switch in WING FIRST position. The most probable cause of this malfunction is the
- A.
Inoperative wing float valve.
- B.
External transfer shutoff valve is bad.
- C.
External vent and pressurization valve is bad.
- D.
Centerline refuel/transfer valve is inoperative.
Correct Answer
D. 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 select switch in NORM position, but the external wing tanks did transfer fuel with the select switch in WING FIRST position. This suggests that there is an issue specifically with the centerline refuel/transfer valve, which is preventing fuel transfer from the external tanks.Rate this question:
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- 24.
24. (209) You are troubleshooting a problem on a fighter aircraft when you discover that none of the external tanks transfer fuel, regardless of the switch positions. The most probable cause of this malfunction is the
- A.
Transfer pumps are inoperative.
- B.
Refuel/transfer valves are inoperative.
- C.
Vent and pressurization valve is inoperative.
- D.
Centerline tank manual shutoff valve is inoperative.
Correct Answer
C. Vent and pressurization valve is inoperative.Explanation
The most probable cause of the malfunction is that the vent and pressurization valve is inoperative. This valve is responsible for regulating the pressure inside the external tanks and allowing fuel to transfer between the tanks. If the valve is not functioning properly, it can prevent the transfer of fuel from occurring, regardless of the switch positions.Rate this question:
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- 25.
25. (210) The fuel level control valve on a cargo aircraft is operated
- A.
Hydromechanically and controlled by fuel pressure.
- B.
Hydromechanically and controlled by a solenoid.
- C.
And controlled hydromechanically.
- D.
And controlled by a solenoid.
Correct Answer
B. Hydromechanically and controlled by a solenoid.Explanation
The correct answer is "hydromechanically and controlled by a solenoid." This means that the fuel level control valve on a cargo aircraft is operated using a combination of hydraulic and mechanical mechanisms, and its control is regulated by a solenoid.Rate this question:
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- 26.
26. (210) While transferring fuel from an auxiliary tank on a cargo aircraft, in order to determine if the auxiliary tank is empty, you would observe the
- A.
Pressure gauge.
- B.
Fuel no-flow light
- C.
Fuel quantity indicator.
- D.
Low-level warning light
Correct Answer
C. Fuel quantity indicator.Explanation
To determine if the auxiliary tank is empty while transferring fuel on a cargo aircraft, you would observe the fuel quantity indicator. This is because the fuel quantity indicator provides a visual display of the amount of fuel remaining in the tank. By monitoring the fuel quantity indicator, you can determine if the tank is empty or if there is still fuel present.Rate this question:
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- 27.
27. (211) The cargo aircraft component that is designed to sense fuel pressure and transmit a signal to an indicator on the fuel management panel to allow you to determine the output pressure of a boost pump is the pressure
- A.
Gauge.
- B.
Switch.
- C.
Transmitter.
- D.
Sensing element.
Correct Answer
C. Transmitter.Explanation
The cargo aircraft component that is designed to sense fuel pressure and transmit a signal to an indicator on the fuel management panel to allow you to determine the output pressure of a boost pump is the transmitter. The transmitter is responsible for converting the fuel pressure into an electrical signal that can be interpreted by the indicator. This allows the pilot or operator to monitor the fuel pressure and ensure that it is within the desired range for proper operation of the boost pump.Rate this question:
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- 28.
28. (211) Which indication shows that a boost pump on a cargo aircraft is putting out sufficient pressure?
- A.
Pressure indicator reads 20 pounds per square inch (psi).
- B.
PRESS LOW light extinguishes.
- C.
Pressure indicator reads 16 psi.
- D.
PRESS LOW light illuminates.
Correct Answer
B. PRESS LOW light extinguishes.Explanation
When the PRESS LOW light extinguishes, it indicates that the boost pump on the cargo aircraft is putting out sufficient pressure. This means that the pressure indicator reading of 20 psi is considered adequate for the boost pump to maintain proper pressure levels. When the PRESS LOW light is illuminated, it suggests that the boost pump is not providing enough pressure, which is not the case in this scenario.Rate this question:
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- 29.
29. (212) To prevent the introduction of foreign objects into the fuel transfer system of a cargo aircraft, the jettison mast is equipped with a
- A.
Flame arrestor screen.
- B.
Safety wire device.
- C.
Check valve.
- D.
Flapper.
Correct Answer
A. Flame arrestor screen.Explanation
The jettison mast is a part of the fuel transfer system in a cargo aircraft. Its purpose is to allow for the rapid jettisoning or dumping of fuel in case of an emergency. To prevent any foreign objects from entering the fuel transfer system during this process, the jettison mast is equipped with a flame arrestor screen. This screen acts as a barrier, preventing any debris or foreign objects from entering the system and potentially causing damage or contamination.Rate this question:
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- 30.
30. (212) Which type of fuel valves control the flow of fuel through the jettison system?
- A.
Vent.
- B.
Refuel.
- C.
Transfer.
- D.
Dump.
Correct Answer
D. Dump.Explanation
Fuel valves control the flow of fuel through different systems in an aircraft. In this case, the question specifically asks about the fuel valves that control the flow of fuel through the jettison system. The jettison system is used to quickly and safely remove excess fuel from the aircraft in emergency situations or to reduce weight for landing. Therefore, the correct answer is "Dump," as dump valves are specifically designed to control the flow of fuel through the jettison system.Rate this question:
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- 31.
31. (213) What safety feature in the bomber aircraft fuel dump system prevents the accidental dumping of fuel while the aircraft is on the ground?
- A.
The DUMP switch cover is safety-wired closed.
- B.
The landing gear must be in the airborne position.
- C.
The DUMP switch is spring-loaded to the OFF position.
- D.
A shorting plug must be connected for the dump valve to open.
Correct Answer
B. The landing gear must be in the airborne position.Explanation
The correct answer is that the landing gear must be in the airborne position. This safety feature ensures that fuel cannot be accidentally dumped while the aircraft is on the ground. By requiring the landing gear to be in the airborne position, it prevents any unintended activation of the fuel dump system during ground operations. This helps to prevent any potential hazards or accidents that could occur if fuel were to be dumped while the aircraft is on the ground.Rate this question:
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- 32.
32. (213) 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 only.
- B.
Forward weapons bay vent disconnect valve only.
- 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 valve only.Explanation
The correct answer is the Ballast tank isolation valve only. This means that in addition to the dump valve, only the Ballast tank isolation valve needs to be open in order to allow fuel into the wing transfer lines to be dumped overboard. The other options, such as the Forward weapons bay vent disconnect valve and the Main pressure actuated vent valve, are not necessary for this process.Rate this question:
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- 33.
33. (214) Which would most likely be used to control the automatic pump shutoff, when all fuel is depleted from a fuel tank?
- A.
Float valves.
- B.
Float switches.
- C.
Toggle switches.
- D.
Pressure switches.
Correct Answer
B. Float switches.Explanation
Float switches are the most likely device to be used to control the automatic pump shutoff when all fuel is depleted from a fuel tank. Float switches are designed to detect the level of a liquid, such as fuel, in a tank. When the fuel level drops to a certain point, the float switch will activate and send a signal to shut off the pump, preventing it from running dry. This helps to protect the pump from damage and ensures that fuel is not wasted. Toggle switches, pressure switches, and float valves are not specifically designed for this purpose, making float switches the correct answer.Rate this question:
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- 34.
34. (214) Refueling by using the fuel-level control valves is a much safer operation than filler neck refueling because the valves will
- A.
Signal the refueling monitor when to stop the fuel flow.
- B.
Shut down the refueling vehicle if the tanks start to overflow.
- C.
Provide an automatic refueling of a tank to any desired level.
- D.
Automatically stop the flow of fuel into a tank prior to overflow.
Correct Answer
D. Automatically stop the flow of fuel into a tank prior to overflow.Explanation
The correct answer is that the fuel-level control valves automatically stop the flow of fuel into a tank prior to overflow. This means that the valves have a safety mechanism in place to prevent the tanks from overflowing during refueling.Rate this question:
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- 35.
35. (214) What principle is used to operate fuel-level control valves?
- A.
Static.
- B.
Venturi.
- C.
Pressure.
- D.
Hydromechanical.
Correct Answer
D. Hydromechanical.Explanation
Hydromechanical principle is used to operate fuel-level control valves. This principle involves the use of mechanical devices that are operated by hydraulic pressure to control the fuel level. It combines the principles of both hydraulics and mechanics to regulate the flow of fuel and maintain the desired fuel level in the system. This method is commonly used in various fuel control systems to ensure proper fuel supply and prevent any fuel-related issues.Rate this question:
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- 36.
36. (214) What part of a piston-type fuel-level control valve prevents fuel from entering the tank?
- A.
The float
- B.
A spring.
- C.
A pilot valve.
- D.
The diaphragm
Correct Answer
C. A pilot valve.Explanation
The pilot valve is the part of a piston-type fuel-level control valve that prevents fuel from entering the tank. It is responsible for regulating the flow of fuel and ensuring that the correct amount is delivered to the engine. The pilot valve acts as a gatekeeper, opening and closing to control the fuel flow based on the demands of the engine. By effectively managing the fuel supply, the pilot valve helps maintain the proper fuel level in the tank and prevents any excess fuel from entering.Rate this question:
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- 37.
37. (215) Approximately how much air space is left at the top of the tanks of a cargo aircraft after ground refueling?
- A.
1 percent.
- B.
3 percent.
- C.
5 percent.
- D.
7 percent.
Correct Answer
B. 3 percent.Explanation
After ground refueling, approximately 3 percent of the air space is left at the top of the tanks of a cargo aircraft.Rate this question:
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- 38.
38. (215) The single point receptacle in a cargo aircraft refuel system is opened by engaging
- A.
With fuel pressure and closed by spring tension.
- B.
With fuel pressure and closed by the refueling nozzle.
- C.
The lever on the refueling nozzle and closed by fuel pressure.
- D.
The lever on the refueling nozzle and closed by spring tension.
Correct Answer
D. The lever on the refueling nozzle and closed by spring tension.Explanation
In a cargo aircraft refuel system, the single point receptacle is opened by engaging the lever on the refueling nozzle. This action allows fuel pressure to flow into the receptacle. Once refueling is complete, the lever is released, and the receptacle is closed by spring tension. The spring tension ensures that the receptacle remains securely closed, preventing any fuel leakage.Rate this question:
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- 39.
39. (215) To allow fuel to flow from a cargo aircraft single point receptacle to the main wing manifold during ground refueling, the
- A.
Single point receptacle drain valve must be open.
- B.
Center separation valve must be open.
- C.
Refuel isolation valve must be open.
- D.
Right separation valve must be open.
Correct Answer
C. Refuel isolation valve must be open.Explanation
To allow fuel to flow from a cargo aircraft single point receptacle to the main wing manifold during ground refueling, the refuel isolation valve must be open. This valve is responsible for allowing fuel to pass through from the single point receptacle to the main wing manifold, which then distributes the fuel to the aircraft's fuel tanks. If the refuel isolation valve is closed, fuel will not be able to flow through, preventing the refueling process. Therefore, it is necessary for the refuel isolation valve to be open in order for fuel to be successfully transferred during ground refueling.Rate this question:
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- 40.
(216) What component is installed between the refuel manifold and each external tank on a fighter aircraft to permit selective refueling of the externals?
- A.
Refuel shuttle valve.
- B.
Refuel/transfer control valve.
- C.
Poppet-type refuel shutoff valve.
- D.
Manually operated fuel shutoff valve.
Correct Answer
D. Manually operated fuel shutoff valve.Explanation
The correct answer is "Manually operated fuel shutoff valve." This valve is installed between the refuel manifold and each external tank on a fighter aircraft to allow selective refueling of the externals. It is manually operated, meaning that it can be controlled by the pilot or ground crew to open or close the fuel flow to the external tanks as needed.Rate this question:
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- 41.
41. (216) When the FWD fuel system on the fighter aircraft is refueled, what tank will fill first?
- A.
F–1.
- B.
Left wing.
- C.
Right wing.
- D.
FWD reservoir.
Correct Answer
D. FWD reservoir.Explanation
When the FWD fuel system on the fighter aircraft is refueled, the FWD reservoir tank will fill first. This means that the fuel will be stored in the FWD reservoir tank before being distributed to other tanks such as the left wing, right wing, and other parts of the aircraft.Rate this question:
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- 42.
42. (216) What is the refueling sequence for the AFT fuel system on a fighter aircraft?
- A.
AFT reservoir, A–1 tank, then left wing tank.
- B.
A–1 tank, AFT reservoir, then left wing tank.
- C.
Left wing tank, A–1 tank, then AFT reservoir.
- D.
Left wing tank, AFT reservoir, then A–1 tank.
Correct Answer
A. AFT reservoir, A–1 tank, then left wing tank.Explanation
The correct answer is AFT reservoir, A-1 tank, then left wing tank. This sequence is the correct refueling sequence for the AFT fuel system on a fighter aircraft. The AFT reservoir is refueled first, followed by the A-1 tank, and then the left wing tank. This sequence ensures that the fuel is distributed properly throughout the aircraft's fuel system.Rate this question:
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- 43.
43. (217) During refueling of a fighter aircraft, fuel was vented overboard and the refueling operation would not stop. The most probable cause of this problem is an inoperative
- A.
Refuel shutoff valve.
- B.
Refuel/transfer float valve.
- C.
Refuel/transfer control valve.
- D.
Selective refueling shutoff valve.
Correct Answer
A. Refuel shutoff valve.Explanation
The most probable cause of the fuel venting overboard and the refueling operation not stopping is an inoperative refuel shutoff valve. This valve is responsible for controlling the flow of fuel during refueling and stopping the process when necessary. If the valve is not functioning properly, it would not be able to shut off the fuel flow, leading to the continuous venting and inability to stop the refueling operation.Rate this question:
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- 44.
44. (218) What light on a bomber aircraft aerial refueling system lets the pilot know 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 light.Explanation
The blue READY/NWS light on a bomber aircraft aerial refueling system lets the pilot know if all conditions are satisfied prior to boom and receptacle connection.Rate this question:
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- 45.
(218) The aerial refueling circuitry on a bomber aerial refueling system is energized by the camoperated aerial refuel
- A.
Master switch.
- B.
Pressure switch.
- C.
Pull-to-refuel-handle.
- D.
Pull-to-refuel switch.
Correct Answer
D. Pull-to-refuel switch.Explanation
The correct answer is "pull-to-refuel switch." 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 system and allow fuel transfer from the tanker aircraft to the bomber aircraft. It is operated by pulling a handle or switch, which initiates the refueling process.Rate this question:
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- 46.
46. (218) The reverse aerial refueling shutoff valve is a
- A.
Motor-operated butterfly valve.
- B.
Cable-operated butterfly valve.
- C.
Motor-operated gate valve.
- D.
Cable-operated gate valve.
Correct Answer
A. Motor-operated butterfly valve.Explanation
The correct answer is motor-operated butterfly valve. This type of valve is used in the reverse aerial refueling system and is operated by a motor. A butterfly valve is a type of valve that uses a disc or plate to control the flow of fluid. In this case, the valve is specifically designed for aerial refueling and is operated by a motor, allowing for precise control and adjustment of the flow of fuel during the refueling process.Rate this question:
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- 47.
47. (219) What action(s) will generate command output signals from the EMUX and energize the aerial refuel power supply on a bomber aircraft?
- A.
Pulling down the PULL REFUEL T-handle only.
- B.
Placing the MODE switch in the NORM position only.
- C.
Pushing up on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
- D.
Pulling down the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
Correct Answer
D. Pulling down the PULL REFUEL T-handle and placing the MODE switch in the NORM position.Explanation
Pulling down the PULL REFUEL T-handle and placing the MODE switch in the NORM position will generate command output signals from the EMUX and energize the aerial refuel power supply on a bomber aircraft.Rate this question:
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- 48.
48. (219) Which condition will result in an automatic disconnect of the boom and receptacle during aerial refueling on a bomber aircraft?
- A.
Low pressure condition exists.
- B.
Boom travel limits are exceeded.
- C.
Fuel center of gravity is off balance.
- D.
Reset trigger on pilot’s stick is pressed.
Correct Answer
B. Boom travel limits are exceeded.Explanation
When 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 boom travel limits can cause damage to the boom or the receptacle, posing a safety risk. Therefore, the system is designed to automatically disconnect in order to prevent any potential damage or accidents.Rate this question:
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- 49.
49. (219) A manual disconnect of the tanker and receiver on a bomber aircraft has been accomplished. What action will reset the UARRSI and signal amplifier, causing the READY/NWS light to illuminate?
- A.
Cycling the slipway door closed and open.
- B.
Pressing the aerial refueling RESET button.
- C.
Placing the MODE switch to the NORM position.
- D.
Placing the pilot trigger switch to the first detent.
Correct Answer
D. Placing the pilot trigger switch to the first detent.Explanation
Placing the pilot trigger switch to the first detent will reset the UARRSI (Universal Air Refueling Receptacle Slipway Installation) and signal amplifier, causing the READY/NWS (Ready/Nozzle) light to illuminate. This action indicates that the manual disconnect has been reset and the aircraft is ready for aerial refueling operations again. Cycling the slipway door closed and open, pressing the aerial refueling RESET button, and placing the MODE switch to the NORM position do not specifically address the resetting of the UARRSI and signal amplifier.Rate this question:
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- 50.
50. (220) You are troubleshooting a malfunction in a bomber aerial refueling system. The fault code for the malfunction is 28–25-AM. What does the letter “A” indicate?
- A.
The faulty system or subsystem only.
- B.
A fault isolation diagram is provided.
- C.
The faulty component within the system
- D.
Corrective action required to fix problem.
Correct Answer
B. A fault isolation diagram is provided.Explanation
The letter "A" in the fault code indicates that a fault isolation diagram is provided. This diagram helps in identifying the specific system or subsystem that is faulty. By referring to the fault isolation diagram, the technician can narrow down the problem and focus on troubleshooting the identified system or subsystem.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 16, 2012Quiz Created by
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