Trivia Quiz : ATM And APU Emergency Shutdown Procedures!

When operating the APU/ATM system in hangers without an automatic Fire Suppression System (FSS), it is necessary to have two 150 lbs Halon fire extinguishers available. One extinguisher should be placed near the running APU/ATM, and a major Crash/Fire/Rescue (CFR) vehicle should be on standby outside the hangar. This is to ensure that there are sufficient fire safety measures in place to mitigate any potential fire hazards that may arise during the operation of the APU/ATM system.

The APU fire extinguisher bottles are located in the lower aft corner of the #4 MLG (Main Landing Gear) wheel well.

If the "GEN FAIL" light comes on, it indicates a failure in the generator system. Continuing to operate the system could cause further damage or potentially lead to a more serious issue. Therefore, the best course of action is to shut down immediately to prevent any potential harm or damage.

To operate the ATM's, PTU's or the engine pumps, a minimum of 4500 lbs of fuel is required in the #2 and #3 main fuel tanks. This amount of fuel is necessary to provide case drain fluid cooling for the hydraulic systems.

The correct answer is Flight engineer panel and loadmaster forward control panel. The APU fire extinguisher bottle select switches are located on both the flight engineer panel and the loadmaster forward control panel.

During the operation of the ATM (Assault Tactical Mobility), a qualified operator will be located at the flight engineer's station. This position is responsible for monitoring and controlling the aircraft's systems, including the engines, fuel, and electrical systems. The flight engineer works closely with the pilot and provides assistance and support during the flight. They ensure the smooth operation of the aircraft and are trained to handle any technical issues that may arise during the mission.

The explanation for the given correct answer is that in order to pressurize the number 2 and number 3 hydraulic systems on the INBD ELEVATOR panel, it is necessary to ensure that the left system 3 and right system 2 hydraulic power switches are set to OFF. This step is important to avoid any potential issues or malfunctions during the pressurization process. Therefore, the statement "True" indicates that this is the correct procedure to follow.

During APU operation, if an APU fire occurs, a steady light will be indicated in the applicable APU fire pull handles. Additionally, an APU fire light on the pilot's enunciator panel will flash and an audible horn will sound.

The APU should be run unloaded for 2 minutes prior to shutting down for cooling purposes. Running the APU unloaded helps to reduce the temperature of the system before shutting it down, preventing any potential damage or overheating. This allows the APU to cool down gradually and ensures that it is in a safe state before shutting off completely.

If the battery voltage check shows less than 22.5 Volts in a battery, the correct action to take is to either replace the battery or disconnect the battery electrical plug. This is necessary because a battery with a voltage lower than 22.5 Volts may not provide sufficient power for proper functioning and could potentially cause malfunctions or failures in the system it is powering. Therefore, replacing the battery or disconnecting the electrical plug ensures that a fully charged and functional battery is used.

If the APU GEN FAIL light comes on during APU operations, it indicates a failure in the APU generator. This failure can lead to a loss of power supply from the APU, which can be critical for the aircraft's operations. Therefore, the appropriate action to take in this situation is to immediately shut down the APU to prevent any further damage or potential safety risks.

The correct answer is 2 minutes because the APU (Auxiliary Power Unit) requires a warm-up time before it can handle any load. This warm-up time allows the APU to reach its optimal operating temperature and ensures that it is ready to provide power efficiently. A warm-up time of 2 minutes is sufficient for the APU to stabilize and be able to handle the load effectively.

After pulling the APU fire handle, it is necessary to wait five seconds before placing the battery switch off in order to allow time for the fuel valves to close. This is important because closing the fuel valves will cut off the fuel supply to the fire, helping to extinguish it. By waiting for the fuel valves to close, the risk of the fire spreading or reigniting is minimized.

The given statement implies that when either APU generator is supplying power to the aircraft, all buses except the monitor buses will be powered. This means that the number 2 and 3 main AC buses, the DC powered buses, and the number 2 and 3 DC buses will all receive power from the APU generator. However, the monitor buses will not be powered by the APU generator.

In order to operate the APU with the APU compartment door open, it is necessary to have a fireguard present at the APU compartment. This fireguard should have an adequate fire extinguisher to handle any potential fire hazards that may arise during the operation. The presence of a fireguard with a fire extinguisher ensures that any fire incidents can be promptly and effectively addressed, minimizing the risk of damage or harm.

The maximum continuous EGT with the APU operating is 691 degrees C. This means that the APU can operate continuously at this temperature without any risk of overheating or damage. It is important to monitor the EGT to ensure that it stays within the acceptable range to maintain the safe and efficient operation of the APU.

Before starting the ATM's to recharge the APU start accumulators, the electric suction boost pumps must be turned on. This is necessary to ensure proper suction and circulation of fuel to the APU start accumulators, allowing them to be recharged effectively. The boost pumps help maintain the required fuel pressure for the APU start accumulators, ensuring their proper functioning.

The correct answer is through the APU compartment push-in door. This is because the APU compartment push-in door is specifically designed to allow access to the APU compartment in case of emergencies, such as a fire. By discharging a fire extinguisher through this door, it can effectively reach the APU compartment and help extinguish the fire.

The correct answer is 2850-3150 PSI. This range represents the normal pressure for ATM pumps.

To prevent APU hot starts, it is necessary to maintain a minimum accumulator pressure. The correct answer is 2800 psi. This pressure ensures that there is sufficient fuel flow and ignition for a successful start without causing excessive heat buildup. Lower pressures may result in inadequate fuel flow, leading to a hot start where the APU combustor ignites before the fuel-air mixture is properly established. Higher pressures may not be necessary and could potentially cause other issues. Therefore, maintaining an accumulator pressure of at least 2800 psi is crucial for preventing APU hot starts.

The correct answer states that the "ON SPEED" light should come on within 30 seconds if the temperature is 0°F and above, or within 60 seconds if the temperature is -65°F to 0°F, after the APU "START" light comes on. This means that the "ON SPEED" light indicates that the APU has reached its operating speed within the specified time frame, ensuring that it is ready to be used.

The left APU accumulator from #1 system and the right APU accumulator from #4 system are used to pressurize the APU accumulators.

An ATM can operate without normal hydraulic pressure for up to 15 seconds. This means that if there is a temporary loss of hydraulic pressure, the ATM will still be able to function for a short period of time before it completely stops working. This could be due to a power outage or a malfunction in the hydraulic system. However, after 15 seconds, the lack of hydraulic pressure will likely cause the ATM to shut down and become inoperable.

During APU start, the EGT (Exhaust Gas Temperature) reading usually ranges between 630-691 degree C. However, if the EGT reading goes beyond this range and reaches 716-824 degree C, it indicates a malfunction. This higher EGT reading suggests that there may be an issue with the APU, such as a fuel problem or a malfunctioning component. It is important to address this malfunction to ensure the safe operation of the APU.

During normal operation, the APU generator ac load meter should not exceed a reading of 1.0. This limit is set to ensure that the load on the APU generator does not exceed its capacity and cause damage or failure. If the load meter reading exceeds 1.0, it indicates that the load on the generator is too high and corrective actions should be taken to reduce the load and prevent any potential issues.

If the aircraft is on jacks, or if the two main landing gear cross knelled, or if the #1 touchdown relay circuit breaker is pulled, the APU low oil pressure switch will be overridden. This means that the low oil pressure protection for the APU will be disabled. Additionally, the APU fire warning audible horn will not sound in this situation.

The fireguard's duties include positioning themselves at the APU station, establishing communication with the flight engineer's station, closely examining the APU for leaks or substandard conditions, notifying the flight engineer's station if any issues are found, and aborting the start if necessary. The correct answer states that the fireguard will comply with all of these duties.

The APU's max start time from the start light to "ON SPEED" at 0 degrees F and above is 30 seconds.

The operating minimum time to fully charge the left and right start accumulators is 5 minutes. This means that it takes a minimum of 5 minutes to charge both accumulators to their maximum capacity.

During the operation of an APU (Auxiliary Power Unit), it is essential to have one battery that is serviceable and connected to the battery bus. This is necessary to provide power for APU fire extinguishing and emergency APU shutdown. In the event of a fire on the APU or the need to shut it down immediately, having a battery connected to the bus ensures that there is a reliable power source for these critical functions. Without a serviceable battery connected, the APU fire extinguishing system may not be able to function properly, which could lead to a dangerous situation. Additionally, an emergency APU shutdown may be required in certain situations, and having a connected battery ensures that this can be done effectively.

The battery switch must be in the NORM or STBY position if it has been modified by TCTO 1C-5-736 to the ON position. This suggests that the TCTO 1C-5-736 modification allows for the battery switch to be in either the NORM or STBY position when the ON position is selected.

When starting an APU without external power (battery start), it is necessary to have a fire truck stand by during starting and single APU operation. This is because starting an APU involves the use of fuel and there is a potential risk of fire. Having a fire truck on standby ensures quick response in case of any fire-related emergencies during the APU start-up and operation.

During the start of an APU (Auxiliary Power Unit), there is a maximum duration for the transient EGT (Exhaust Gas Temperature) between 715E and 824E C, which is 20 seconds. This means that the EGT can reach and stay within this temperature range for a maximum of 20 seconds during the APU start process.

The APU can operate with the EGT (Exhaust Gas Temperature) reading between 691E and 746E C for a maximum of 3 minutes. This means that if the EGT exceeds these temperatures, the APU should be shut down or cooled down to prevent any damage or malfunction.

The correct answer is 115 +/- 3. This means that the AC Voltmeter should read a value between 112 and 118, with the ideal reading being 115 volts. This range allows for a small margin of error, ensuring that the voltage is within an acceptable range for the AC system panel.

System 1 and/or system 4 gauges should indicate a pressure range of 2,850 to 3,150 PSIG and a specific pressure of 3000 +/- 150 PSIG during ATM/APU operations.

The AC system panel CPS frequency meter should read 400Hz +/-6, which means that the acceptable frequency range is from 394 to 406 Hz. This indicates that the frequency of the AC system should ideally be at 400Hz, but a variation of up to +/-6Hz is permissible. The given answer accurately represents the acceptable range for the CPS frequency meter reading.

In the event of an APU/ATM fire, it is important to notify ground control or the control tower immediately. They should be informed of the aircraft's tail number, location, and the type of emergency, in this case, a fire. Additionally, it is necessary to request assistance from the fire department to handle the situation effectively and ensure the safety of everyone involved.

The first step in the proper order is to select the unaffected electrical power source. Then, the operator must pull the applicable APU fire pull handle. Finally, with the bottle select switch in NORM, the operator should depress the applicable agent discharge button.