APU Emergency Shutdown Procedures

The correct answer is AC because it is the correct option to complete the sentence. The sentence instructs the reader to place the "EXT ___ PWR switch" to OFF, and the only option that fits in the blank space is AC. This suggests that the reader should turn off the external AC power by selecting the AC option.

The first step in an emergency shutdown is to pull the APU fire control handle. This action is crucial in order to stop any potential fire or hazard caused by the APU (Auxiliary Power Unit). By pulling the APU fire control handle, the power supply to the APU is cut off, preventing any further damage or risk. This step should be taken immediately to ensure the safety of the aircraft and its occupants.

If the AGENT DISCHARGE/AGENT DISCH is held for too long, it may cause the fire extinguisher circuit breaker to trip and the fire extinguisher system to become inoperative. This means that the system designed to extinguish the fire will no longer be able to function, potentially allowing the fire to continue spreading and becoming uncontrollable.

The correct answer is DC because in this context, "EXT" most likely refers to an external power source, and "PWR" stands for power. Therefore, "Place EXT ___ PWR switch to OFF" means to turn off the external power source.

Do not hold the AGENT DISCHARGE/
AGENT DISCH switch to NO. 1 or NO. 2
for more than two seconds.

It only requires Mech A and B.

Step 3 instructs to request fire department assistance. This implies that this step contains the necessary information or action to be taken in order to contact the fire department for help.

The correct answer is Step 7 because this is the step where the BLEED AIR VALVE/BL AIR switch should be placed to CLOSE/OFF. Placing the switch in this position will shut off the flow of bleed air, which is necessary in certain situations such as during engine start or in the event of a bleed air leak.

The correct answer is to monitor the fire area and stand by with a fire extinguisher until assistance arrives. This step is important to ensure the safety of personnel and to prevent the fire from spreading or causing further damage. By monitoring the fire area, one can assess the situation and take necessary actions if needed. Standing by with a fire extinguisher allows for immediate response in case the fire worsens or poses a threat. Waiting for assistance to arrive ensures that trained professionals can handle the situation effectively and safely.

In step 8, the correct answer is to place the APU GENERATOR/APU switch to the OFF or OFF/RESET position. This action is necessary in an emergency situation to shut off the APU generator and prevent any potential electrical hazards. By turning off the APU generator, the risk of fire or further damage can be minimized.

The correct answer is "WARNING" because in emergency situations, a warning is given to indicate that the fire has become severe and immediate evacuation of all personnel from the airplane and the surrounding area is necessary for their safety. The warning serves as a clear signal to take immediate action and prioritize the safety of individuals.

not-available-via-ai

The correct answer is to place the APU GENERATOR/APU switch to the OFF position and the OFF/RESET position. This means that the switch controlling the APU generator should be turned off, and the switch should also be in the off or reset position.