Questions tagged [apu]

Auxiliary Power Unit. A device for providing alternate power to an aircraft, usually located in the aircraft's tail.

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270 views

Why does the APU Master Switch flash during a normal APU shutdown?

Hi all and Happy New Year!!! I have a question relating to APU shutdown procedures on Airbus A320. During normal APU shutdown sequences, I noticed that after around 1m20s, the FAULT legend on APU ...
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718 views

F-15 APU or JFS

Can a portable GTCP-85 series be used on an F-15? Or is there no capability to use an external APU. As I understand, F-15's use the JFS-190?
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1answer
208 views

BLEED FAULT lamp illumination under various conditions [closed]

In lots of commercial and defence aircrafts, bleed fault is annunciated because of mainly the following reasons: Overpressure/Overheat shut-off valve disagreement (i.e. failed open, failed closed) ...
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2answers
131 views

What's the starting envelope of APU?

I was reading the APS-3200 training manual (pg 268) and faced this part: What's the starting envelope of APU? What does mean "Normal start throughout the operating envelope: minus 300 m to 11900 ...
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2answers
197 views

On a Boeing 737, can the APU, BY ITSELF, provide enough thrust to move the plane while on the ground? [duplicate]

There are numerous questions and answers about the ability of an APU to provide enough thrust to maintain flight. In contrast, my question is whether the APU, by itself, provides enough thrust to ...
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1answer
141 views

What is the fuel burn of the APU on the CRJ900?

Looking for a reference from an FCOM, AFM or other manual for the fuel consumption per hour in pounds or kilos of the Honeywell RE 200 APU on the CRJ900.
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1answer
187 views

How is an A320 on the ground kept cool inside if the APU fails?

What happens to the air conditioner when the APU is not available due to damage or it just fails? Also adding that the airport does not have an air conditioning unit. Since it is above average sea ...
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1answer
682 views

How much power does the APU generate in a Boeing 737-300?

I have just watched Mayday episode 11, season 11, "Nowhere to Land" about TACA Flight 110 incident and I was more than surprised to learn that: APU must be turned on, APU needs about 5-10 minutes to ...
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1answer
859 views

What is the function of the hole at the rear of the airplane? [duplicate]

What is the function of the hole at the rear of a plane? I searched online but didn't get a satisfying answer.
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1answer
3k views

On the A320, why is it not recommended to use the HP ground unit when the APU Bleed is on?

Can someone explain what the HP ground unit is used for? And what damage happens to the bleed system if it is used?
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146 views

If the APU is switched off but the APU bleed is on, will the engine bleed valve close automatically?

On he A320 family aircraft, if the APU is switched off but the APU bleed is on, will the engine bleed valve closed by the Bleed Monitoring Computer (BMC)? This what I understood after going through ...
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1answer
214 views

How do aircraft batteries power the engine/APU? [duplicate]

I fail to understand how do batteries power up the jet engines/APU. Are they responsible for starting up the Ignition that ignites the air-fuel mixture? Or is there some other function which I'm ...
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260 views

In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? [closed]

In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? There are some of the maintenance activities that are related to removal of Engines or APU. Removal reason: Smoke in cabin ...

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