https://saemobilus.sae.org/papers/space-shuttle-orbiter-auxiliary-power-unit-820838
820838: Space Shuttle Orbiter Auxiliary Power Unit - Technical Paper
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https://army-guide.com/eng/product.php?prodID=5490&printmode=1
Army Guide - DEA-2, Auxiliary power unit
Army Guide - information about the main battle tanks, armoured vehicles and armament of the land forces and also the information concerning other army subjects...
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https://www.thermoenginesupply.com/products/10-61-6630
DEHYDRATOR, AUXILIARY POWER UNIT (APU) AFTER 10/06 | Thermo Engine Supply
Shop Dehydrator, Auxiliary Power Unit (apu) After 10/06 (Part #10-61-6630). Find Thermo King aftermarket parts at Thermo Engine Supply.
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https://www.lot.com/at/en/explore/inspirations/aviation-trivia/apu-on-a-plane
Auxiliary Power Unit — what is an APU in an aircraft? | LOT.com
APU – the third engine of the aircraft. Read our article and find out what an Auxiliary Power Unit is.
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