auxiliary power unit

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Related to auxiliary power unit: Ram air turbine, Ground Power Unit

auxiliary power unit

[ȯg′zil·yə·rē ′pau̇·ər ‚yü·nət]
(aerospace engineering)
A power unit carried on an aircraft or spacecraft which can be used in addition to the main sources of power. Abbreviated APU.

auxiliary power unit (APU)

A power generation unit for operation of systems like hydraulic, air conditioning, electrical, and avionics. It may provide AC (alternate current) or DC (direct current) supply. The APU is normally used prior to starting the aircraft and for testing systems on the ground. In rare cases, it can provide some thrust in an emergency. Ground auxiliary power units provide current for starting engines. See airborne/auxiliary power unit.
References in periodicals archive ?
Battenberg III said that if progress continues as expected, Delphi's SOFC auxiliary power unit (APU) will be generating electricity for military applications, passenger cars, heavy-duty trucks and homes sometime during the second half of this decade.
Pratt & Whitney is a world leader in the design, manufacture and service of aircraft engines and auxiliary power units.
Browse 49 market data Tables and 13 Figures spread through 145 Pages and in-depth TOC on "Aerospace & Military Auxiliary Power Unit (APU) Market".
The Japan Transport Safety Board had initially said the battery for the auxiliary power unit was intact, but later found the slight swelling following detailed scrutiny through a computed tomography scan.
Energy & Engine Technology Corporation recently debuted its newest auxiliary power unit (APU) for the long-haul trucking industry, dubbed the AXP Gen-A-Sys, at last week's Mid-American Trucking Show (MATS) in Louisville, KY.
The two recognized Navy teams are Navy/General Electric F404 PBL Team (sub-system level winner) and the Navy/Honeywell Auxiliary Power Unit Total Logistics Support PBL team (component level winner).
entered into an alliance with Doncasters in February to manufacture turbo-machinery for the Boeing 787 auxiliary power unit, the APS5000.
But in as little as four years from now he expects SOFC technology to be available on a smaller scale as an auxiliary power unit (APU) that would replace a vehicle's 12-V battery and raise fuel-to-electric efficiency from the current 10-17% to 35-50%.
An inquiry found an engine turbine oil leak from the auxiliary power unit generator cooling fan.
Pike Research's report, "Fuel Cells for Auxiliary Power Unit Applications", analyzes the market potential for fuel cells to be utilized as APUs in marine, trucking, aviation, and RV markets.
The subject of public procurement is the overhaul of auxiliary power unit SAPHIR 5th
NYSE: UTX), said it has signed a long-term repair support agreement for the APS5000 auxiliary power unit (APU) with Air India Ltd.

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