NASA Photo ID: S90-38627           File Name: 10063554.jpg
  Film Type: 4x5 BW                  Date Taken: 05/23/90
  Title: STS-31 Discovery, OV-103, auxiliary power unit 1 (APU-1) controller
  The controller for Discovery's, Orbiter Vehicle (OV) 103's, auxiliary power 
  unit 1 (APU-1) is documented before removal following the launch scrub on 
  04-10-90.  The controller weighs about 15 pounds and controls the speed of 
  the APU.  It was flown to the vendor, Sundstrand Corp., Rockford, Illinois, 
  for analysis and testing. Launch of OV-103 on mission STS-31 has been 
  rescheduled for 04-24-90 following the successful replacement of the APU-1 
  and the recharging of the Hubble Space Telescope's (HST's) nickel-hydrogen 
  batteries.  View provided by the Kennedy Space Center (KSC) with alternate 
  KSC number KSC-90PC-663.              
  Subject terms:
  AUXILIARY POWER SOURCES                 
  DISCOVERY (ORBITER)                     
  FAILURE ANALYSIS                        
  KENNEDY SPACE CENTER                    
  ONBOARD EQUIPMENT                       
  SPACECRAFT MAINTENANCE                  

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