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STS 51-I was the sixth Discovery shuttle flight. On board were Joe Engle, Richard Covey, James Van Hoften, William Fisher, and John Lounge. Deployed during the mission were Aussat-1 (Australia), ASC 1 (American Satellite Corporation), and SYNCOM IV-4 (Hughes Corporation). A repair was made to SYNCOM IV-3 which was launched by STS 51-D in April 1985. SYNCOM IV-4 (also known as LEASAT-4) failed to function after reaching correct geosynchronous orbit. Fisher and van Hoften performed 11 hours, 27 minutes of space walk. Part of the time was spent retrieving, repairing and redeploying LEASAT-3, which was deployed on Mission 51-D. The Middeck Payload consisted of: Physical Vapor Transport Organic Solid Experiment (PVTOS).

The mission duration was 170 hours 17 minutes 42 seconds.

Alternate Names

  • 15992
  • STS 20
  • STS51I

Facts in Brief

Launch Date: 1985-08-27
Launch Vehicle: Shuttle
Launch Site: Cape Canaveral, United States
Mass: 19988 kg

Funding Agency

  • NASA-Office of Space Flight (United States)


  • Human Crew

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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