2a674 Volume 2 CDC's Ure's

To troubleshoot a problem on the ground refueling system for a fighter aircraft, it is important to refer to the applicable aircraft technical order. This is because the technical order provides detailed instructions and procedures specific to the aircraft, which can help identify and resolve the issue effectively. By following the guidance in the technical order, the technician can ensure that the troubleshooting process is done properly and in accordance with the manufacturer's recommendations.

A totalizer is a feature of a fighter fuel quantity indicator that will indicate the sum of fuel in all tanks on the aircraft. This means that it will provide a cumulative measurement of the fuel in all the tanks, rather than individual measurements for each tank.

The advantage of the quick-change electrically driven fuel pump is that it does not require any special tools to install. This means that it can be easily and quickly installed without the need for additional equipment or resources.

The jettison mast in a cargo aircraft is equipped with a flame arrestor screen to prevent the introduction of foreign objects into the fuel transfer system. This screen acts as a barrier, allowing fuel to pass through while preventing any debris or foreign objects from entering the system. This helps to ensure the safety and proper functioning of the fuel transfer process.

After ground refueling, approximately 3% of air space is left at the top of the tanks of a cargo aircraft.

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.

Using fuel-level control valves can make refueling a safer operation because these valves are designed to automatically stop the flow of fuel into a tank before it reaches the point of overflow. This helps to prevent any potential accidents or spills that could occur if the tank were to overfill. By automatically shutting off the fuel flow, the valves provide a reliable safety mechanism during the refueling process.

The individual tank vent manifolds on a cargo aircraft vent system terminate in the vent box. This means that the vent system is designed so that the vents from each tank come together and terminate in a common vent box. The vent box is responsible for safely venting any excess pressure or vapors from the tanks.

Placing the tank inert switch to the TANK INERTING position will initiate the combat pressure schedule of the internal vent and pressurization valve on a fighter aircraft. This action allows the internal tanks to be pressurized to a specific level, which is necessary for combat operations.

Fuel valves control the flow of fuel through various 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 dump fuel from the aircraft in emergency situations or to reduce weight for landing. Therefore, the correct answer is "Dump" as it refers to the fuel valves that control the flow of fuel through the jettison system.

The correct answer is that the landing gear must be in the airborne (UP) position. This safety feature prevents the accidental dumping of fuel while the aircraft is on the ground. When the landing gear is in the airborne position, it ensures that the aircraft is not on the ground and therefore the fuel dump system will not activate. This is an important safety measure to prevent fuel from being accidentally dumped while the aircraft is on the ground, which could cause damage or pose a safety risk.

Rough handling of the valve could result in the malfunction of a vent float valve. This is because rough handling can cause damage to the valve, such as bending or breaking of the internal components. This damage can prevent the valve from functioning properly, leading to a malfunction.

The engines on a tanker aircraft are directly fed from the main tanks.

To determine whether or not the single-point receptacle manifold drain shutoff valve has opened, the best method is to observe the manual override lever. This lever allows manual control of the valve and indicates its position. By observing the lever, one can determine if the valve is in the open or closed position. This method is reliable and does not require any additional tools or measurements.

The correct answer is the Central Integrated Test System (CITS) control and display panel in the aft crew station. This is because the fault isolation diagram specifically requests that the parameter monitor code (PMC) be entered on the CITS control and display panel. The other options mentioned, such as the CITS control and display panel on the windshield center post or the system status panel, are not specified in the diagram as the correct location for entering the PMC. Therefore, the correct location to comply with the request is the CITS control and display panel in the aft crew station.

The correct answer is TEST. When the fuel quantity select switch is in the TEST position on a fighter aircraft, the TOTAL digital readout displays the total fuel on the aircraft. In all other positions (RSVR, NORM, EXT CTR), the digital readout does not display the total fuel.

An O-ring is a type of seal that is commonly used between the disc and valve body on a disc-type valve. It is a round rubber ring that is placed in a groove on the valve body and creates a tight seal when compressed between the disc and the valve body. O-rings are known for their ability to provide a reliable and leak-free seal, making them a popular choice for various applications in the industry.

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 pump is functioning properly and maintaining the required pressure levels.

The correct answer is Hydromechanical. Hydromechanical principle is used to operate fuel-level control valves. This means that the valves are operated by a combination of hydraulic and mechanical components, allowing for precise control of the fuel level in a system.

The fuel on a tanker aircraft must be routed to feed any engine from any main tank through the crossfeed manifold. The crossfeed manifold allows for fuel to be transferred between tanks, ensuring that all engines have access to fuel regardless of which tank it is stored in. This system allows for flexibility in fuel distribution and helps to maintain balance and stability in the aircraft during flight.

The most probable cause for the circuit breaker to continue "popping" in the crossfeed system is that the valve motor has shorted out. This means that there is an electrical issue with the motor, causing it to malfunction and draw excessive current, which leads to the circuit breaker tripping. This is a likely explanation because a short circuit in the motor can cause an overload in the electrical system, resulting in the circuit breaker being activated to protect the circuit from further damage.

To correct a fuel imbalance caused by too much fuel in the forward fuel system of a fighter aircraft, you would place the ENGINE FEED switch in the FWD position. This is because the FWD position directs fuel flow to the forward fuel system, which helps to balance the fuel distribution in the aircraft.

Fuel is transferred from the reserve tank on a tanker aircraft during flight through gravity flow. This means that the fuel flows from the reserve tank to the main tank due to the force of gravity. This method does not require any external pressure or pumps to transfer the fuel.

The output pressure and flow ratings of a centrifugal pump being greater than the system's fuel requirements ensures that even if one pump fails, there will still be enough fuel supply to meet the needs of the system. This is important for maintaining the continuous operation and functionality of the system, preventing any disruptions or failures due to fuel shortage.

The best method for troubleshooting a fighter engine feed system component when suspecting leaking 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 identified and addressed promptly.

The vent float valve operates by means of a mechanical linkage. This means that the valve is controlled and operated by a system of physical connections and mechanisms, rather than by an electric solenoid, flight controls, or fuel pressure. The mechanical linkage allows for precise and reliable control of the valve, ensuring that it functions correctly to regulate the flow of fluid or gas.

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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 receiving the appropriate amount of pressure, which can help identify any potential issues with the pump itself. By checking the direct pressure reading, you can rule out any problems with power, pressure switch readings, or continuity of the pressure switch, and focus specifically on the pump itself.

A malfunctioning boost pump is the most probable cause of the malfunction in the crossfeed system. The boost pump is responsible for providing pressure to route fuel to the crossfeed manifold. If the boost pump is not functioning properly, it would result in a lack of pressure and the fuel would not be able to flow to the crossfeed manifold. This would explain why there is no pressure available to route fuel in this situation.

A pressure switch is designed to sense low pressure and send a signal to an indicator light. When the pressure drops below a certain threshold, the pressure switch is triggered and sends an electrical signal to activate the indicator light, alerting the user to the low pressure condition. This allows for timely action to be taken to address the low pressure situation.

To determine if the auxiliary tank is empty while transferring fuel from it, you would observe the fuel quantity indicator. This instrument provides a visual indication of the amount of fuel remaining in the tank. By monitoring the fuel quantity indicator, you can determine when the tank is empty and the transfer process can be stopped. The pressure gauge, fuel no-flow light, and low-level warning light are not specifically designed to indicate the fuel level in the tank, so they would not provide an accurate measurement of the tank's emptiness.

The vent system on a cargo aircraft is used to prevent overboard fuel spillage. This is important because during flight, the fuel tanks can expand and contract due to changes in temperature and pressure. If there is no vent system in place, excess fuel could be forced out of the tanks, leading to fuel spillage and potential hazards. The vent system allows for the controlled release of pressure and prevents fuel from being spilled overboard, ensuring the safe operation of the aircraft.

The fuel flow to the engine on a tanker aircraft is controlled by an electric motor-driven shutoff valve. This means that the valve is operated by an electric motor, allowing for precise control of the fuel flow. This type of valve is likely used because it provides more accurate and efficient control compared to a manually operated valve.

If the boost-pump inlet screens are clogged, it can restrict the flow of fuel into the tank scavenge system. This can result in reduced fuel supply to the engine, leading to a negative effect on the operation of the tank scavenge system.

If the flapper valve in the sump box is missing, fuel would be allowed to flow out of the sump box. The flapper valve is responsible for preventing fuel from flowing out of the sump box and into other parts of the tank scavenge system. Without the flapper valve, there would be no barrier to stop the fuel from escaping the sump box, potentially causing fuel leakage and affecting the operation of the tank scavenge system.

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The purpose of the power transfer method on a fighter aircraft is to augment fuel transfer and scavenge the tanks. This means that the power transfer method is used to increase the rate at which fuel is transferred from one tank to another, as well as to remove any excess fuel or air from the tanks. This ensures that the aircraft has a steady and efficient fuel supply during flight.

Fighter aircraft typically have multiple pumps in their power transfer systems to ensure reliable and efficient operation. These pumps are responsible for transferring fuel, hydraulic fluid, and other essential fluids throughout the aircraft. Having multiple pumps also provides redundancy, so that if one pump fails, the others can still function and maintain the necessary power transfer. Therefore, the correct answer to the question is 6, indicating that there are six pumps used in the power transfer system of a fighter aircraft.

If the flapper valve is missing in the sump box, it means there is no barrier preventing fuel from flowing out of the sump box. This would allow fuel to freely flow out of the sump box, potentially causing fuel leakage or loss.

During the first few minutes of a ground refueling operation, it is important to operationally check the fuel-level control valves on a cargo aircraft. These valves are responsible for controlling the flow of fuel and maintaining the appropriate fuel levels in the aircraft. By checking these valves, any potential issues or malfunctions can be identified early on, ensuring the safe and efficient refueling of the aircraft.

The correct answer is F-1. The F-1 fuel tank on the fighter aircraft contains a bladder cell for fuel storage.

The internal tank vent and pressurization valve on a fighter aircraft is located in the vent tank.

Fuel cooler heat exchangers cool fuel before it is returned to the main tanks. This is important because fuel can become heated during the operation of the aircraft, and cooling it before returning it to the tanks helps to maintain the fuel at a safe temperature. The other options, such as the ACL heat exchangers, ICL heat exchangers, and hydraulic heat exchangers, do not specifically cool fuel and are not directly related to the cooling of fuel prior to returning it to the main tanks.

The reverse aerial refueling shutoff valve is a motor-operated butterfly valve. This means that it is controlled by a motor that opens and closes the valve by rotating a disc or plate in the valve body. This type of valve is commonly used in applications where a tight shut-off is required, such as in the reverse aerial refueling system. The motor-operated butterfly valve offers precise control over the flow of fluid, making it ideal for this application.

During a phase inspection, various components and systems of the fighter aircraft are thoroughly checked and tested. This includes checking the internal tank vent and pressurization systems. Any problems or issues with these systems are likely to be discovered during this inspection, as it involves a detailed examination of the aircraft's systems and components. Therefore, it is the most appropriate time for identifying and addressing any internal tank vent and pressurization problems on a fighter aircraft.

When the thermistor head on a fuel-level sensor for a fighter aircraft is covered with fuel, it will cause the temperature of the thermistor to decrease. This is because the fuel absorbs heat from the thermistor, causing it to cool down. At the same time, the presence of the fuel also increases the resistance of the thermistor. This is because the fuel acts as an insulator, hindering the flow of electric current through the thermistor. Therefore, the correct answer is a decrease in temperature and an increase in resistance.

After a defuel operation, the fuel is drained from the main wing manifold of a cargo aircraft through gravity flow. This means that the fuel is allowed to flow out of the manifold naturally, without the need for any additional pumps or valves. Gravity flow is a simple and efficient method for draining fuel, as it relies on the force of gravity to move the fuel out of the manifold and into a collection container. This method is commonly used in aircraft fuel systems to ensure that all the fuel is safely and completely drained.

The F-1 tank is protected from collapsing by the pressurization system.

When a system malfunction on a bomber aircraft is detected by the Central Integrated Test System (CITS), a CITS maintenance code (CMC) is generated. This code is used to identify the specific maintenance action that needs to be taken to address the fault. It helps maintenance personnel in troubleshooting and fixing the issue efficiently. The CMC provides valuable information about the fault and guides the maintenance process, ensuring that the problem is resolved effectively.

The correct answer is reservoir tank units. This means that the fuel low-level sensors on a fighter aircraft are located in the reservoir tank units.