Auxiliary Power Unit Airplane

The apu auxiliary power unit is the power unit contained on an aircraft which can provide electrical and pneumatic air power.

Auxiliary power unit airplane.

Starting power for the main engines. Unlike the aircraft s main engines the apu outputs almost no thrust. In airliners apu s are usually located at the very rear of the aircraft below the tail. The unit provides compressed air for air conditioning while the airplane is on the ground and at limited altitude in flight.

Pneumatic power for cabin air conditioning systems. Auxiliary power units are usually found on large aircraft and naval ships as well as some large land vehicles. Most of the power produced is used to run an electric generator and provide pneumatic air pressure. An auxiliary power unit or apu allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit an external air conditioning unit or a high pressure air start cart.

The airborne auxiliary power is obtained from a gas turbine auxiliary power unit apu. Another version of the gpu is fep fixed electrical power. 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. The auxiliary power unit apu is a small gas turbine engine mounted in the tail cone of an aircraft to provide autonomous electrical and mechanical power for the following.

The primary purpose of an aircraft apu is to provide power to start the main engines. The auxiliary power unit safir 5k g mi is designed to supply air to engine starters and environmental control systems to drive the ac generator and to supply power to hydraulic systems. An auxiliary power unit apu is a device on a vehicle that provides energy for functions other than propulsion they are commonly found on large aircraft and naval ships as well as some large land vehicles. It also features a dual speed sensor exhaust gas temperature sensor oil and fuel signaling filter contamination and signaling of low oil levels.

How an auxiliary power unit works. With more than 95 000 apus produced and more than 36 000 in service today honeywell has a large apu installed base and is poised for further growth. Others can produce 28 v. The gpu ground power unit is connected by the ground crew when the aircraft arrives at the gate an provides electrical power only.