What are the three sections of the auxiliary power unit?

An APU is a gas turbine with three sections: the power section, load compressor and gearbox. The power section is a turbine engine that provides power to the APU, the load compressor supplies pneumatic pressure to the aircraft and the gearbox transmits power from the APU to an electric generator.

How are APUs powered?

The APU is equipped with an extra electrical generator to create enough power to operate onboard lighting, galley electrics and cockpit avionics, usually while the aircraft is parked at the gate. Drawing bleed air from its own compressor, an APU also drives the environmental packs used to heat and cool the aircraft.

What happens to an aircraft if the APU fails?

Failure of an APU in air or ground results in cancellation or delay in flight departure, which inhibits flight operations. An aircraft APU that requires maintenance after 7000 flight hours, would require a maintenance cost of nearly $0.4 Million [4].

What is APU compartment?

The APU compartment is by definition a fire zone (see fig. 2). It is isolated from the rest of the airplane by a firewall. The APU installation uses the same fire hazard mitigation principles as the engines listed above, plus: Automatic shutdown of the APU.

What is Qrh in aviation?

Description. The Quick Reference Handbook (QRH) contains all the procedures applicable for abnormal and emergency conditions in an easy-to-use format. In addition, performance data corrections are also provided for specific conditions. The QRH is a stand-alone document.

Can an aircraft fly without APU?

Without an APU an aircraft would depend on GSE only for starting one engine with pressurized ground supplied air. Aircraft are allowed in general to fly without an APU. Exceptions are flights with two-engined aircraft and long routes over water or terrain without an alternate airport – so called ETOPS flights.

Do you need an APU to fly?

In most airline operations, APU is not mandatory. In ETOPS operations, FAA requires that the APU be present if it is required for the aircraft for complying with ETOPS requirements.

Can APU produce thrust?

The APU is a turbine engine that sits in the tail of the aircraft. It provides no thrust. Like any jet engine, it takes in air, compresses it, adds a fuel mixture and ignites it. Once started, the APU powers both an electrical generator and an air compressor, Plumb explained.

What is auxiliary power unit (APU)?

Design of Auxiliary Power Unit (APU) for co-operation with turboshaft engine p.20. 3. AUXILIARY POWER UNIT (APU) The APU is an independent jet engine installation and an element of the engine installed normally at the tail of the aircraft, in airplanes, and at the lower part after the cabin, in helicopters.

What is the weight of the alphanova 52 auxiliary power unit?

Design of Auxiliary Power Unit (APU) for co-operation with turboshaft engine p.37 Components:  Evaporator/Compressor: the model AlphaNova 52 weights 1,9+0,22*n kg (n is the number of plates).

What are the recommended sealants for the auxiliary power unit (APU)?

Recommended sealants Design of Auxiliary Power Unit (APU) for co-operation with turboshaft engine p.36 are neoprene and EPDM for the area of elastomers and PVC, PP and PS for the area of thermoplastics. SOLKATHERM®SES36 main characteristics:

Can a solid oxide fuel cell–gas turbine system be used as Apu?

Solid oxide fuel cell–gas turbine system as an aircraft auxiliary power unit [76]. Another simulation study investigated two configurations of an SOFC–GT system ( Fig. 12.13) as the APU of a 300-passenger long-range aircraft [78]. Similar to the study mentioned above, the target electrical power requirement was 440 kW.