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Ref : S10446

Theme : Testings - Satellites - Probes - Rockets  (2314 images)

Title : Technicians install a new Auxiliary Power Unit (APU) in the aft compartment

Caption :

(04/14/1990) -- Technicians install a new Auxiliary Power Unit (APU) in the aft compartment of the orbiter Discovery at Pad 39-B. The unit replaces APU #1 that failed during the STS-31 countdown on April 10.