Where is the auxiliary power unit APU located in most transport aircraft?
tail cone
The APU is a small jet engine which is normally located in the tail cone of the aircraft but, in some cases, is located in an engine nacelle or in the wheel well.
Do all aircrafts have APU?
Do all airliners have an APU? Most every modern turbojet powered airliner (including the smaller regional jets) have an APU installed in the tail. Only a few large turboprop aircraft have them due to the weight restrictions of smaller aircraft.
What is the function of Apu in a helicopter?
An APU is an auxiliary power unit, used to power the turbine engines up at start up and/or to power various systems while the jet engine is shut down. I don’t know of any helicopters that use an APU, which is usually the province of large jet aircraft (think airliners and military transports).
What is the difference between Apu and GPU in an aircraft?
The APU (Auxiliary Power Unit) is the power unit contained on an aircraft which can provide electrical and pneumatic (air) power. The GPU (Ground Power Unit) is connected by the ground crew when the aircraft arrives at the gate an provides electrical power only. Another version of the GPU is FEP (Fixed Electrical Power).
What type of power does an aircraft auxiliary power unit use?
Auxiliary power unit. Aircraft APUs generally produce 115 V alternating current (AC) at 400 Hz (rather than 50/60 Hz in mains supply), to run the electrical systems of the aircraft; others can produce 28 V direct current (DC). APUs can provide power through single- or three-phase systems.
When do you use the APU?
Circumstances that require the usage of the APU is normally during engine start-up when to external power is provided (power provided from an external battery from the ground crew) and on bigger aircraft to re start the engine in flight after a flame out. Hope this clears the air a bit for you.