2A656 Vol 5 Ure (2013) Jet Aircraft

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(807) Oxygen in its natural state is
- Colorless, tasteless, and odorless.
- Colorless, tasteless, and weightless.
- Odorless, massless, and volumeless.
- Odorless, massless, and weightless.

About This Quiz

This quiz assesses knowledge of fire suppression systems in jet aircraft, focusing on the mechanics of liquid fire-extinguishing agents and system indicators. It is crucial for roles in aircraft maintenance and safety, testing understanding of system components and emergency responses.

2A656 Vol 5 Ure (2013) Jet Aircraft - Quiz

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2.

(801) A gaseous nitrogen (N2) charge is added to a liquid fire-extinguishing agent to
- Convert the liquid to a gas upon discharge.
- Expel the agent from its bottle.
- Assist in extinguishing the fire.
- Stabilize the temperature.
Correct Answer

A. Expel the agent from its bottle.

Explanation

The gaseous nitrogen charge is added to a liquid fire-extinguishing agent in order to expel the agent from its bottle. When the fire extinguisher is discharged, the pressure from the gaseous nitrogen forces the liquid agent out of the bottle, allowing it to be sprayed onto the fire. This helps to effectively extinguish the fire by covering it with the extinguishing agent.

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3.

(801) The frangible disc is undercut into pie shaped sections in a liquid-agent fire extinguisher container to
- Break easily.
- Break cleanly into large pieces.
- Allow the pieces to enter the strainer unclogging it.
- Enable the pieces to pass easily through the strainer.
Correct Answer

A. Break cleanly into large pieces.

Explanation

The frangible disc is undercut into pie-shaped sections in a liquid-agent fire extinguisher container in order to break cleanly into large pieces. This design allows for easy and efficient activation of the extinguisher when needed, as the disc can be easily broken into large fragments. This ensures that the extinguishing agent can be quickly and effectively released into the fire, maximizing its effectiveness.

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4.

(801) How does a liquid fire-extinguishing agent extinguish an aircraft fire?
- Releases a fine mist vapor.
- Releases nitrogen into the area.
- Removes oxygen from the fire.
- Disperses a heavy concentration of liquid.
Correct Answer

A. Removes oxygen from the fire.

Explanation

A liquid fire-extinguishing agent extinguishes an aircraft fire by removing oxygen from the fire. Oxygen is necessary for combustion, so by eliminating or reducing the oxygen supply, the fire cannot sustain itself and is extinguished. This can be achieved by creating a barrier between the fire and the surrounding air, preventing the fire from accessing oxygen.

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5.

(804) When servicing the aircraft liquid coolant system, leave the used can of coolant fluid installed on the servicing unit to prevent this from happening to the unit.
- Damage.
- Leakage.
- Destruction.
- Contamination.
Correct Answer

A. Contamination.

Explanation

When servicing the aircraft liquid coolant system, leaving the used can of coolant fluid installed on the servicing unit can lead to contamination. This is because the used can may contain impurities or contaminants that can mix with the new coolant fluid, thereby compromising its quality. To prevent this from happening, it is important to remove the used can and properly dispose of it before installing a new one to ensure the coolant system remains uncontaminated.

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6.

(805) Why are multiplace life raft cylinders wire-wound and dip-soldered?
- Decreases metal fatigue.
- Adds strength to the cylinder.
- Decreases cylinder expansion.
- Increases cylinder corrosion resistance.
Correct Answer

A. Adds strength to the cylinder.

Explanation

Multiplace life raft cylinders are wire-wound and dip-soldered to add strength to the cylinder. Wire-winding involves wrapping a wire tightly around the cylinder, which helps to reinforce and strengthen it. Dip-soldering, on the other hand, involves coating the cylinder with a layer of solder, which further enhances its strength. By incorporating these techniques, the cylinders become more durable and able to withstand the harsh conditions they may encounter during use, ensuring the safety of those relying on the life raft.

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7.

(807) Which part of the body usually suffers first from the effects of hypoxia, which is the lack of oxygen at high altitudes?
- Ears.
- Eyes.
- Nose.
- Lungs.
Correct Answer

A. Eyes.

Explanation

At high altitudes, the lack of oxygen, known as hypoxia, can have various effects on the body. The eyes are usually the first part of the body to suffer from these effects. This is because the eyes have a high demand for oxygen and are very sensitive to changes in oxygen levels. The lack of oxygen can cause blurred vision, difficulty focusing, and even temporary vision loss. Therefore, the eyes are more susceptible to the effects of hypoxia compared to other parts of the body.

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8.

(807) What cellulose tape colors identify supply and distribution tubing for aircraft oxygen systems?
- Black and red.
- Blue and yellow.
- Green and white.
- Brown and orange.
Correct Answer

A. Green and white.

Explanation

Green and white cellulose tape colors are used to identify supply and distribution tubing for aircraft oxygen systems. This color combination is commonly recognized and used in aviation to differentiate oxygen-related components from other systems. The use of green and white tape helps ensure proper identification and maintenance of the oxygen system, promoting safety and efficiency in aircraft operations.

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9.

(808) This is a disadvantage of a continuous-flow oxygen regulator compared to the pressuredemand system in a liquid oxygen system (LOX).
- Wastes oxygen.
- Is unusable below 10,000 feet
- Is usable only above 20,000 feet
- Delivers oxygen at varying pressures
Correct Answer

A. Wastes oxygen.

Explanation

A continuous-flow oxygen regulator wastes oxygen because it delivers a constant flow of oxygen regardless of whether the user is inhaling or not. This means that oxygen is being continuously released even when it is not being used, leading to wastage of oxygen.

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10.

(811) You must purge an aircraft’s gaseous oxygen (GOX) system by
- Opening the oxygen bottles.
- Using a liquid oxygen cryotainer.
- Using a gaseous oxygen-servicing trailer.
- Opening the system to the environment for six hours.
Correct Answer

A. Using a gaseous oxygen-servicing trailer.
11.

(802) A flashing red light on the fire emergency control T-handle indicates this has happened.
- An overheat condition.
- An air valve is closed.
- A fuel valve is open.
- A fire.
Correct Answer

A. An overheat condition.

Explanation

A flashing red light on the fire emergency control T-handle indicates an overheat condition. This means that there is excessive heat in the system or equipment, which could potentially lead to a fire if not addressed. The flashing red light serves as a warning signal to alert the operator or user that there is a risk of overheating and immediate action should be taken to prevent any further damage or potential fire hazard.

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12.

(814) You find evidence of oil while using the “ultraviolet light method” of cleaning inspections on the TMU27/M liquid oxygen storage and servicing cart. What action must you take?
- Do nothing.
- Wipe the oil off.
- Reject the part and clean again.
- Reject the part and put in the scrap metal bin.
Correct Answer

A. Reject the part and clean again.

Explanation

If evidence of oil is found while using the "ultraviolet light method" of cleaning inspections on the TMU-27/M liquid oxygen storage and servicing cart, the appropriate action to take is to reject the part and clean it again. This is necessary to ensure that the cart is free from any oil contamination, which is important for the safe storage and servicing of liquid oxygen. Wiping the oil off may not be sufficient to remove all traces of contamination, and putting the part in the scrap metal bin would be unnecessary if it can be properly cleaned.

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13.

What component holds a liquid agent and a nitrogen charge in a liquid-agent fire extinguisher container?
- Squib.
- Frangible disc.
- Bonnet assembly.
- Rubber O-ring packing.
Correct Answer

A. Frangible disc.

Explanation

The frangible disc is the component that holds a liquid agent and a nitrogen charge in a liquid-agent fire extinguisher container. A frangible disc is a thin, breakable disc that seals the container and prevents the agent and charge from escaping. When the extinguisher is activated, the pressure builds up inside the container, causing the frangible disc to rupture and release the agent and charge. This allows the extinguisher to effectively suppress the fire.

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14.

(807) What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?
- 93 percent nitrogen.
- 16 man-minutes of oxygen.
- 93 percent oxygen-enriched gas.
- 100 percent oxygen-enriched gas.
Correct Answer

A. 93 percent oxygen-enriched gas.

Explanation

The molecular sieve oxygen generating system (MSOGS) concentrator supplies 93 percent oxygen-enriched gas to the OXYGEN regulator control panel. This means that the gas being supplied has a higher concentration of oxygen compared to the surrounding air. This is important for providing a sufficient amount of oxygen for various applications, such as medical use or aircraft systems that require oxygen for proper functioning.

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15.

(806) What must you do to ensure your safety when you recharging life raft inflation cylinders?
- Charge in a well ventilated area.
- Allow no one to enter the controlled area.
- Wear your dosimeter badge to ensure proper levels of nitrogen.
- Place the high-pressure cylinders up on the table to get a good flow of liquid.
Correct Answer

A. Charge in a well ventilated area.

Explanation

To ensure safety when recharging life raft inflation cylinders, it is important to charge them in a well-ventilated area. This is necessary to prevent the accumulation of potentially harmful gases or fumes. Ventilation helps to dissipate any gases that may be released during the charging process, reducing the risk of inhalation and potential harm to individuals in the area. This precaution is crucial to maintain a safe working environment and protect the health and well-being of those involved in the recharging process.

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16.

(810) A liquid oxygen (LOX) component is being replaced and you are ready to install the pipethread fittings. Your next step is to
- Check the component for leaks.
- Check the component for proper operation.
- Service with LOX and perform an evaporation check.
- Apply a small amount of anti-seize tape to the first three threads.
Correct Answer

A. Apply a small amount of anti-seize tape to the first three threads.

Explanation

The correct answer is to apply a small amount of anti-seize tape to the first three threads. This step is necessary to ensure that the pipethread fittings can be properly installed and secured. The anti-seize tape helps to prevent the threads from seizing or getting stuck, making it easier to install and remove the fittings in the future. By applying the tape to the first three threads, it ensures that the tape is in the correct position to provide maximum effectiveness.

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17.

(817) While troubleshooting an aircraft liquid oxygen (LOX) storage and transfer tank, you find the safety disc blows out below pressure setting that is caused by a defective pop safety valve. You then take this action with the valve.
- Fill.
- Repair.
- Replace.
- Stabilize.
Correct Answer

A. Replace.

Explanation

The correct action to take with the defective pop safety valve is to replace it. This is because the safety disc blew out below the pressure setting, indicating that the valve is not functioning properly and cannot effectively regulate the pressure in the LOX storage and transfer tank. By replacing the valve, you can ensure the safe and proper operation of the system.

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18.

(803) An aircraft’s liquid coolant system keeps components cool by
- Cycling through the components.
- Directing coolant across the components.
- Cycling conditioned air throughout the system.
- Directing conditioned air across the components.
Correct Answer

A. Cycling through the components.

Explanation

The correct answer is "cycling through the components." An aircraft's liquid coolant system keeps components cool by continuously circulating the coolant through the components. This allows the coolant to absorb heat from the components and carry it away, preventing overheating and ensuring proper functioning of the aircraft's systems.

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19.

(804) Over-torquing clamps, when maintaining an aircraft liquid coolant system, causes this to happen with the clamps’ components.
- Leakage.
- Contamination.
- Nothing happens
- Damage or failure
Correct Answer

A. Damage or failure

Explanation

Over-torquing clamps in an aircraft liquid coolant system can cause damage or failure to the clamps' components. This excessive torque can lead to the clamps becoming weakened or distorted, resulting in potential leaks or complete failure of the clamps. This can be detrimental to the proper functioning of the coolant system and may require repair or replacement of the damaged components.

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20.

(805) Actuating this component normally releases carbon dioxide (CO2) from a life raft cylinder into a life raft.
- Cam.
- Rupture disc.
- Locking sleeve.
- Check valve seat.
Correct Answer

A. Cam.

Explanation

The correct answer is Cam. A cam is a mechanical component that is responsible for actuating or controlling the movement of other parts. In this case, when the cam is actuated, it triggers the release of carbon dioxide from a life raft cylinder into the life raft. The cam mechanism is designed to provide a reliable and controlled release of the gas to inflate the life raft in emergency situations.

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21.

(810) When replacing oxygen tubing, use clamps to support it near all bends and at least every
- 20 inches.
- 15 inches.
- 10 inches.
- 5 inches.
Correct Answer

A. 15 inches.

Explanation

When replacing oxygen tubing, it is important to use clamps to support it near all bends and at least every 15 inches. This is necessary to prevent kinks or bends in the tubing, which can obstruct the flow of oxygen and potentially lead to a dangerous situation for the patient. By clamping the tubing at regular intervals, it ensures that the tubing remains straight and unobstructed, allowing for a consistent and uninterrupted flow of oxygen.

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22.

(814) Once you clean a TMU27/M liquid oxygen storage and servicing cart component, the next step is to
- Inspect the area with a bright light.
- Inspect the area in natural sunlight.
- Install a serviceable tag and place it in a bag.
- Install an oxygen use only tag and place it in a bag.
Correct Answer

A. Inspect the area with a bright light.

Explanation

After cleaning a TMU-27/M liquid oxygen storage and servicing cart component, the next step is to inspect the area with a bright light. This is important to ensure that the component is completely clean and free from any debris, contaminants, or damage. Inspecting with a bright light helps to identify any potential issues or areas that may need further cleaning or maintenance before the component can be used again. It allows for a thorough examination of the component to ensure its proper functioning and safety.

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23.

(808) Liquid oxygen converts to gaseous oxygen at an expansion ratio of
- 600 to 1.
- 680 to 1.
- 800 to 1.
- 860 to 1.
Correct Answer

A. 860 to 1.

Explanation

Liquid oxygen converts to gaseous oxygen at an expansion ratio of 860 to 1. This means that when liquid oxygen is converted into a gas, its volume increases by a factor of 860. This expansion ratio is a measure of how much the substance expands when it changes state from a liquid to a gas.

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24.

(812) After performing an evaporation loss test on a liquid oxygen system, you fill the converter to its capacity with liquid oxygen and
- Allow it to stabilize 2 hours before taking next reading.
- Allow it to stabilize 6 hours before taking next reading.
- Leak check the system.
- Sign off the servicing.
Correct Answer

A. Allow it to stabilize 2 hours before taking next reading.

Explanation

After performing an evaporation loss test on a liquid oxygen system, it is necessary to allow the converter to stabilize before taking the next reading. This is because the converter needs time to reach a steady state after being filled with liquid oxygen. Allowing it to stabilize for 2 hours ensures that any fluctuations in pressure or temperature have settled, providing an accurate reading for the next measurement.

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25.

(804) How many gallons of liquid coolant should initially be pumped into the aircraft liquid coolant system with the radar shunt hose installed?
- 1/2
- 1
- 1 1/2
- 2
Correct Answer

A. 1 1/2

Explanation

The correct answer is 1 1/2. The question is asking for the amount of liquid coolant that should be initially pumped into the aircraft liquid coolant system with the radar shunt hose installed. The answer suggests that 1 1/2 gallons of liquid coolant should be pumped in initially.

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26.

(806) When you are charging a multiplace life raft inflation assembly, do not reposition the assembly on a platform because moving it may
- Cause damage to the life raft.
- Change the hose weight amount.
- Cause the charging hose to detach.
- Require a new check valve control head.
Correct Answer

A. Change the hose weight amount.

Explanation

When charging a multiplace life raft inflation assembly, it is important not to reposition the assembly on a platform because moving it may cause damage to the life raft. This means that changing the hose weight amount is not the correct answer. The other options, such as causing the charging hose to detach or requiring a new check valve control head, are not mentioned in the explanation, so it is not clear why they would be incorrect.

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27.

(807) This valve prevents a complete loss of oxygen in a low-pressure gaseous oxygen system
- Filler.
- Check.
- Shutoff.
- Pressure reducing.
Correct Answer

A. Check.

Explanation

The correct answer is "Check." In a low-pressure gaseous oxygen system, a check valve is used to prevent a complete loss of oxygen. A check valve allows the flow of oxygen in one direction but prevents it from flowing back in the opposite direction. This ensures that oxygen is only able to flow into the system and not escape, thereby preventing a complete loss of oxygen. A check valve is commonly used in oxygen systems to maintain the integrity and safety of the system.

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28.

(809) If you find oxygen system tubing within 2 inches of aircraft control cables, your next step is to
- Reroute control cables.
- Bend or reroute the tubing.
- Inspect for possible burn marks.
- Clamp the tubing to the control cables.
Correct Answer

A. Bend or reroute the tubing.

Explanation

If oxygen system tubing is found within 2 inches of aircraft control cables, the next step is to bend or reroute the tubing. This is necessary to ensure that the tubing does not interfere with the control cables and potentially cause damage or malfunction. By bending or rerouting the tubing, the risk of any potential issues or accidents is minimized, ensuring the safety and proper functioning of the aircraft.

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29.

(811) You are ready to clean components from a gaseous oxygen (GOX) cart. What is the first step?
- Remove any dust or loose debris with a damp cheesecloth.
- Remove any dust or loose debris with filtered air.
- Check with an ultraviolet light.
- Wash the components.
Correct Answer

A. Remove any dust or loose debris with filtered air.

Explanation

The correct answer is to remove any dust or loose debris with filtered air. This is the first step because it is important to ensure that the components are free from any contaminants before proceeding with the cleaning process. Using filtered air helps to prevent any further contamination and ensures that the components are clean and ready for further cleaning or maintenance procedures.

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30.

(817) While transferring liquid oxygen (LOX) from a TMU27/M servicing trailer to an aircraft oxygen converter, you notice the rate of transfer is very slow. You then troubleshoot by looking for
- Perlite settling.
- Low tank pressure.
- Excessive boil off.
- Vacuum valve leakage.
Correct Answer

A. Low tank pressure.

Explanation

The correct answer is low tank pressure. When transferring liquid oxygen (LOX) from a TMU-27/M servicing trailer to an aircraft oxygen converter, a slow rate of transfer can indicate that the tank pressure is too low. Low tank pressure can impede the flow of the liquid oxygen, resulting in a slower transfer rate. To resolve the issue, the tank pressure needs to be increased.

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31.

(802) If the container pressure becomes too low in a T-handle liquid-agent fire extinguishing system, then a
- Pressure switch opens.
- Pressure switch closes.
- Safety outlet port opens.
- Safety outlet port closes.
Correct Answer

A. Pressure switch closes.

Explanation

In a T-handle liquid-agent fire extinguishing system, if the container pressure becomes too low, it indicates that there is not enough pressure to effectively discharge the liquid agent. In order to prevent further loss of pressure, a pressure switch closes, which helps maintain the pressure within the container.

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32.

(803) If air that is trapped in a liquid coolant system is not bled out of the expansion relief valve it
- Causes a low-pressure condition.
- Activates the filter delta pressure switch.
- Forces the thermal modulating valve closed.
- Reduces the cooling capability of the coolant.
Correct Answer

A. Reduces the cooling capability of the coolant.

Explanation

If air is trapped in a liquid coolant system and not bled out of the expansion relief valve, it reduces the cooling capability of the coolant. Air bubbles in the coolant can create pockets of insulation, preventing efficient heat transfer and reducing the coolant's ability to absorb and dissipate heat. This can lead to overheating of the system and potential damage to the components being cooled.

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33.

(803) What valve component of an aircraft liquid coolant system is positioned by the temperature of the coolant?
- Thermal pilot.
- Thermal modulating.
- Delta system bypass.
- Over-pressure relief.
Correct Answer

A. Thermal pilot.

Explanation

The valve component of an aircraft liquid coolant system that is positioned by the temperature of the coolant is called a thermal pilot. This means that the thermal pilot valve adjusts its position based on the temperature of the coolant, allowing for proper regulation and control of the coolant flow.

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34.

(808) Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?
- Crew.
- Troop.
- Low-pressure
- High-pressure.
Correct Answer

A. Troop.

Explanation

The correct answer is Troop. The troop oxygen system allows oxygen to flow automatically to the distribution system when the cabin altitude reaches 12,500 feet. This system is designed to provide oxygen to passengers or troops on board the aircraft in case of a high cabin altitude, ensuring their safety and well-being during the flight.

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35.

(811) On a gaseous oxygen (GOX) servicing trailer, you control the flow of oxygen by
- Opening the manifold valves manually.
- Opening the servicing valves manually.
- Venting the excess pressure off with the recharge valves.
- Venting the excess pressure off with the pressure regulator valves.
Correct Answer

A. Opening the servicing valves manually.

Explanation

On a gaseous oxygen (GOX) servicing trailer, the flow of oxygen is controlled by opening the servicing valves manually. This means that the valves responsible for the release of oxygen are operated by hand to regulate the flow. This method allows for precise control over the amount of oxygen being released from the trailer.

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36.

(816) While performing evacuation procedures on a liquid oxygen (LOX) storage and transfer tank, you find that the vacuum on a cryotainer is too high. What action should you take?
- Vacuum down the storage space of the tank.
- Vacuum down the annular space on the tank.
- Check the reading again with another vacuum gauge.
- Verify the reading on another cryotainer’s annular space.
Correct Answer

A. Vacuum down the annular space on the tank.

Explanation

When performing evacuation procedures on a liquid oxygen (LOX) storage and transfer tank, if the vacuum on a cryotainer is too high, the appropriate action to take is to vacuum down the annular space on the tank. This means reducing the vacuum pressure in the space between the inner and outer walls of the tank. By doing so, the excessive vacuum can be corrected, ensuring proper functioning and safety of the tank.

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37.

(815) You are purging a liquid oxygen (LOX) storage and transfer cart. The purge is considered complete when the temperature of the air exiting the fill and drain outlet has been maintained at this temperature for 1 hour.
- 220 degrees Fahrenheit (°F).
- 250°F.
- 320°F.
- 350°F
Correct Answer

A. 220 degrees Fahrenheit (°F).

Explanation

The correct answer is 220 degrees Fahrenheit (°F). This temperature is considered the threshold for completing the purge of a liquid oxygen (LOX) storage and transfer cart. The air exiting the fill and drain outlet needs to be maintained at this temperature for 1 hour to ensure the complete purge.

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38.

(813) Heat gain and liquid oxygen (LOX) boil-off is minimized in the annular space of a TMU– 27/M LOX storage and transfer-servicing cart using this type insulation.
- Perilate.
- Aluminized polyester film.
- High-grade glass wool.
- Fiberglass and styrofoam.
Correct Answer

A. Aluminized polyester film.

Explanation

Aluminized polyester film is used as insulation in the annular space of a TMU-27/M LOX storage and transfer-servicing cart to minimize heat gain and liquid oxygen (LOX) boil-off. This type of insulation is effective in preventing heat transfer and maintaining the temperature inside the cart. The aluminized coating on the polyester film reflects heat radiation, while the polyester film itself provides thermal insulation. This combination helps to minimize heat gain and reduce the boil-off of LOX, ensuring the safe storage and transfer of the liquid oxygen.

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39.

(808) What component in the pressure-demand oxygen regulator causes 100 percent oxygen to be delivered to the user when the cabin altitude of an aircraft reaches 30,000 feet?
- Air inlet valve.
- Demand valve.
- Diluter aneroid.
- Pressure breathing aneroid.
Correct Answer

A. Diluter aneroid.

Explanation

The diluter aneroid is the component in the pressure-demand oxygen regulator that causes 100 percent oxygen to be delivered to the user when the cabin altitude of an aircraft reaches 30,000 feet. This device is responsible for regulating the oxygen flow based on the altitude, ensuring that the user receives the appropriate amount of oxygen to maintain safe breathing at high altitudes.

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40.

(804) The purpose of purging the servicing unit supply hose in an aircraft liquid coolant system is to
- Remove air from the servicing cart.
- Remove contaminants from the system.
- Prevent air from entering the system.
- Prevent moisture from entering the servicing cart.
Correct Answer

A. Prevent air from entering the system.

Explanation

The purpose of purging the servicing unit supply hose in an aircraft liquid coolant system is to prevent air from entering the system. This is important because air bubbles in the coolant can cause cavitation, which can lead to decreased cooling efficiency and potential damage to the system. By purging the supply hose, any air trapped in the system can be removed, ensuring that only coolant flows through the system and preventing the negative effects of air bubbles.

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41.

(807) What valve is required to decrease system pressure in a high-pressure gaseous oxygen system?
- Relief.
- Closing.
- Control.
- Reducer.
Correct Answer

A. Reducer.

Explanation

A reducer valve is required to decrease system pressure in a high-pressure gaseous oxygen system. This valve is specifically designed to reduce the pressure of the gas flowing through the system. It helps to ensure that the pressure remains within safe limits and prevents any potential damage or hazards that may occur due to high pressure.

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42.

(807) In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of this type alloy.
- Iron.
- Brass.
- Copper.
- Aluminum.
Correct Answer

A. Copper.

Explanation

In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of copper. Copper is commonly used in high-pressure oxygen systems because it is resistant to corrosion and can withstand the high pressure and purity requirements of the system. Copper also has good thermal conductivity, which allows for efficient heat transfer in the system. Additionally, copper is a non-sparking material, making it safer to use in oxygen-rich environments where sparks could potentially cause a fire or explosion.

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43.

(808) What causes oxygen and pressure breathing to be available in the pressure breathing for G (PBG) position once the PBG/ON/OFF toggle is placed in that position?
- Negative signal from the pressure-demand valve.
- Negative signal from the emergency flow valve.
- Positive signal from the diluter valve.
- Positive signal from the anti-G valve.
Correct Answer

A. Positive signal from the anti-G valve.

Explanation

When the PBG/ON/OFF toggle is placed in the PBG position, oxygen and pressure breathing become available in the pressure breathing for G (PBG) position. This is because a positive signal is received from the anti-G valve. The anti-G valve is responsible for regulating the flow of oxygen and pressure during high-G maneuvers, ensuring that the pilot receives the necessary oxygen and pressure to prevent hypoxia and maintain consciousness. Therefore, the positive signal from the anti-G valve allows for the availability of oxygen and pressure breathing in the PBG position.

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44.

(805) What component of a life raft inflation cylinder assembly keeps carbon dioxide (CO2) within the cylinder and permits an unrestricted flow of CO2 to the life raft?
- Diffuser plug.
- Seating sleeve.
- Cartridge filter.
- Discharge valve.
Correct Answer

A. Discharge valve.

Explanation

The discharge valve is the component of a life raft inflation cylinder assembly that keeps carbon dioxide (CO2) within the cylinder and allows for an unrestricted flow of CO2 to the life raft. It is responsible for controlling the release of the gas from the cylinder into the raft, ensuring that it inflates properly and efficiently. The other options, such as the diffuser plug, seating sleeve, and cartridge filter, do not perform this specific function.

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45.

(814) When using a water-soluble cleaning agent from components, the first step is to
- Flush with large quantities of distilled water.
- Dry by purging with oil-free air or specified nitrogen.
- Inspect visually for complete internal moisture removal.
- Dry in an oven with a temperature less than 250 degrees Fahrenheit (deg F).
Correct Answer

A. Flush with large quantities of distilled water.

Explanation

The correct answer is to flush with large quantities of distilled water. When using a water-soluble cleaning agent, the first step is to flush the components with distilled water. This is done to remove any contaminants or residues from the surface of the components. Flushing with distilled water helps to ensure that the cleaning agent can effectively dissolve and remove any dirt or grime present on the components. It is an important step in the cleaning process to ensure that the components are properly cleaned before proceeding with further drying or inspection steps.

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46.

(812) When performing a service test on a low-pressure gaseous oxygen system, after filling the system, you must
- Record the oxygen gauge pressure immediately.
- Record the ambient temperature immediately.
- Wait for the system to cool for three hours.
- Wait for the system to cool for one hour.
Correct Answer

A. Wait for the system to cool for one hour.

Explanation

When performing a service test on a low-pressure gaseous oxygen system, it is necessary to wait for the system to cool for one hour. This is because filling the system with oxygen can cause it to heat up, and waiting for it to cool ensures that accurate measurements can be taken. Recording the oxygen gauge pressure immediately or recording the ambient temperature immediately may not give accurate readings as the system needs time to stabilize. Waiting for three hours to cool is not necessary and one hour is sufficient for the system to reach a stable temperature.

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47.

(813) The transfer hose on a liquid oxygen (LOX) cart is made from stainless steel and this type alloy.
- Bronze.
- Copper.
- Titanium.
- Aluminum.
Correct Answer

A. Bronze.

Explanation

The transfer hose on a liquid oxygen (LOX) cart is made from bronze. Bronze is a suitable material for this application because it has good corrosion resistance and can withstand the low temperatures and high pressures associated with handling liquid oxygen. Stainless steel, copper, titanium, and aluminum may not have the necessary properties to safely handle liquid oxygen, making bronze the correct choice.

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48.

(815) After purging a liquid oxygen (LOX) storage and transfer cart, the next step is to
- Continue to allow the unit to cool the cryotainer to 120 degrees Fahrenheit (°F).
- Continue to allow the unit to cool the cryotainer to 150°F.
- Turn off the unit and let the cryotainer to cool down to 120°F.
- Turn off the unit and let the cryotainer to cool down to 150°F.
Correct Answer

A. Continue to allow the unit to cool the cryotainer to 150°F.
49.

(808) What is the handle on a manually operated buildup and vent valve designed to prevent on an aircraft liquid oxygen (LOX) system?
- Slow pressure buildup
- Rapid venting of system pressure
- Filler access door from closing in the vent position
- Liquid oxygen system pressure loss during maintenance
Correct Answer

A. Filler access door from closing in the vent position

Explanation

The handle on a manually operated buildup and vent valve is designed to prevent the filler access door from closing in the vent position. This means that when the valve is operated, it ensures that the filler access door remains open, allowing for the rapid venting of system pressure. This is important in an aircraft liquid oxygen (LOX) system as it prevents pressure buildup and ensures the safe release of excess pressure.

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(807) Oxygen in its natural state is

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