File:STS-126 APU installation.jpg

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English: In Orbiter Processing Facility bay No. 2, technicians begin installation of auxiliary power unit 3, or APU3, in space shuttle Endeavour for the STS-126 mission. The auxiliary power unit is a hydrazine-fueled, turbine-driven power unit that generates mechanical shaft power to drive a hydraulic pump that produces pressure for the orbiter's hydraulic system. There are three separate APUs, three hydraulic pumps and three hydraulic systems, located in the aft fuselage of the orbiter. When the three auxiliary power units are started five minutes before lift-off, the hydraulic systems are used to position the three main engines for activation, control various propellant valves on the engines and position orbiter aerosurfaces. The auxiliary power units are not operated after the first orbital maneuvering system thrusting period because hydraulic power is no longer required. One power unit is operated briefly one day before deorbit to support checkout of the orbiter flight control system. One auxiliary power unit is restarted before the deorbit thrusting period. The two remaining units are started after the deorbit thrusting maneuver and operate continuously through entry, landing and landing rollout. On STS-126, Endeavour will deliver a multi-purpose logistics module to the International Space Station.
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Kim Shiflett    wikidata:Q117448892
 
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creator QS:P170,Q117448892
This image or video was catalogued by Kennedy Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: KSC-08PD-1651 and Alternate ID: KSC-08pd1651.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current17:07, 11 December 2010Thumbnail for version as of 17:07, 11 December 20103,000 × 2,008 (4.12 MB)Myself488 (talk | contribs)== {{int:filedesc}} == {{Information |Description={{en|1=In Orbiter Processing Facility bay No. 2, technicians begin installation of auxiliary power unit 3, or APU3, in space shuttle Endeavour for the STS-126 mission. The auxiliary power unit is a hydrazi

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