Auxiliary Power Unit Aircraft Function

Starting power for the main engines.

Auxiliary power unit aircraft function.

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. Auxiliary power units are usually found on large aircraft and naval ships as well as some large land vehicles. 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. An mt is a mechanism that uses the flow of a gas to convert thermal energy into mechanical energy.

Pneumatic power for cabin air conditioning systems. Apu is the smallest engine on airplanes. Shaft power for other pneumatic and hydraulic systems. Design of auxiliary power unit apu for co operation with turboshaft engine p 9 the section that comes below presents types of aircraft engines.

An auxiliary power unit also known as apu is a device on a vehicle that provides energy for functions other than propulsion. Applications include powering environmental systems for pre cooling or preheating the cabin and providing power for crew functions such as preflight cabin cleanup and galley kitchen operation. Knowing this will be an explanation of auxiliary power units apu and how they are involved in the operation of an aircraft. Please like and subscribe.

In airliners apu s are usually located at the very rear of the aircraft below the tail. 2 3 6 the combustible usually gas is mixed in the combustion chamber with air. Apu is necessary to start up the main engines it also powers the airplane s electronics. The technology used in the mt is derived from diesel engine turbochargers aircraft auxiliary power systems and automotive designs mts consist of a compressor combustor turbine and generator as shown in fig.

Others can produce 28 v. Apu generators provide auxiliary electrical power for running aircraft systems on the ground when the main engines aren t running and no ground electrical power is available.