Airframe APUs

Aircraft auxiliary power units (APUs) provide power to various systems when the main engines are not running. These units offer an efficient power supply for an aircraft, ensuring smooth operations and enhanced safety. Trusted manufacturers of APUs in aviation like Boeing, BAE Systems Controls Inc., and Honeywell guarantee quality and durable products meant to withstand the harsh conditions seen by aircraft. Browse our selection of aircraft APUs to find the perfect solution for your needs.
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Auxiliary Power Unit-ACS-DR Drain Fitting Aft
Auxiliary Power Unit-ACS-DR Drain Fitting Aft

Mfr Part#
486Z4426-4

Link-Auxiliary Power Unit Demountable, Aft
Link-Auxiliary Power Unit Demountable, Aft

Mfr Part#
4917021-1

49 Auxiliary Power Unit ECU OPS
49 Auxiliary Power Unit ECU OPS

Mfr Part#
491A-TUS-A04-00

49 Auxiliary Power Unit ECU OPS
49 Auxiliary Power Unit ECU OPS
Honeywell International Inc

Mfr Part#
491A-TUS-A51-00

Auxiliary Power Unit ECU OPS
Auxiliary Power Unit ECU OPS
Honeywell International Inc

Mfr Part#
491ATUSA5100

49 Auxiliary Power Unit ECU OPS
49 Auxiliary Power Unit ECU OPS
Honeywell International Inc

Mfr Part#
491B-TUS-A05-00

Track Cover Assembly, Un-Powered 787 PLU
Track Cover Assembly, Un-Powered 787 PLU
TE Connectivity

Mfr Part#
5-1954397-9

Adaptor Assembly-PPU
Adaptor Assembly-PPU
Liebherr Aerospace Lindenberg GmbH

Mfr Part#
521B0200-01

Adaptor Assembly-PPU
Adaptor Assembly-PPU
Liebherr Aerospace Lindenberg GmbH

Mfr Part#
521A0200-01

Indicator-Oil Quantity-Auxiliary Power Unit
Indicator-Oil Quantity-Auxiliary Power Unit

Mfr Part#
521466

Exhaust Gas Temperature Auxiliary Power Unit
Exhaust Gas Temperature Auxiliary Power Unit

Mfr Part#
521163

IND-Auxiliary Power Unit Exhaust Temperature
IND-Auxiliary Power Unit Exhaust Temperature

Mfr Part#
521285

Obsolete Part Use 527-212MA9B9C6S-1
Obsolete Part Use 527-212MA9B9C6S-1
The Boeing Company

Mfr Part#
527-212MA9B9C4S-1

Auxiliary Table
Auxiliary Table
Safran Cabin Galleys US Inc

Mfr Part#
544091-11

Support Power Supply Unit Large A
Support Power Supply Unit Large A
The Boeing Company

Mfr Part#
544W1115-5

Auxiliary Power Unit
Auxiliary Power Unit

Mfr Part#
5910050-535

SUPT A
SUPT A

Mfr Part#
5923349-1N

Auxiliary Power Unit - Auxiliary Power Unit DEM
Auxiliary Power Unit - Auxiliary Power Unit DEM

Mfr Part#
5940405-503

Supt A
Supt A

Mfr Part#
5956034-524N

Duct Assembly - Auxiliary Power Unit Exhaust, Upper
Duct Assembly - Auxiliary Power Unit Exhaust, Upper

Mfr Part#
5963909-501

Frequently Asked Questions

What is an APU in an aircraft?

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An APU in an aircraft is a device that provides energy for functions other than propulsion, including powering hydraulic systems, air conditioning, and airframe electrical systems.

How does an aircraft APU work?

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An APU in aviation works by generating electrical power, providing air for starting engines, and powering other systems when the main engines are off.

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