|Names||Space Transportation System-16|
|Mission type||Communications satellite deployment|
|Mission duration||6 days, 23 hours, 55 minutes, 23 seconds (achieved)|
|Distance travelled||4,650,658 km (2,889,785 mi)|
|Spacecraft||Space Shuttle Discovery|
|Launch mass||113,802 kg (250,890 lb)|
|Landing mass||89,818 kg (198,015 lb)|
|Payload mass||13,039 kg (28,746 lb)|
|EVA duration||3 hours, 6 minutes|
|Start of mission|
|Launch date||12 April 1985, 13:59:05 UTC|
|Rocket||Space Shuttle Discovery|
|Launch site||Kennedy Space Center, LC-39A|
|End of mission|
|Landing date||19 April 1985, 13:54:28 UTC|
|Landing site||Kennedy Space Center,|
SLF Runway 33
|Reference system||Geocentric orbit|
|Regime||Low Earth orbit|
|Perigee altitude||300 km (190 mi)|
|Apogee altitude||452 km (281 mi)|
|American Flight Echo-cardiograph (AFE)|
Continuous Flow Electrophoresis System (CFES-III)
Getaway specials (GASs)Phase Partitioning Experiments (PPE)
STS 51-D mission patch
Back row: S. David Griggs, Charles D. Walker, Jake Garn
Front row: Karol J. Bobko, Donald E. Williams, Margaret Rhea Seddon, Jeffrey A. Hoffman
STS-51-D was the 16th flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery. The launch of STS-51-D from Kennedy Space Center (KSC), Florida, on 12 April 1985 was delayed by 55 minutes, after a boat strayed into the restricted Solid Rocket Booster (SRB) recovery zone. STS-51-D was the third shuttle mission to be extended.
On 19 April 1985, after a week-long flight, Discovery conducted the fifth shuttle landing at KSC. The shuttle suffered extensive brake damage and a ruptured tire during landing. This forced all subsequent shuttle landings to be done at Edwards Air Force Base, California, until the development and implementation of nose wheel steering made landings at KSC more feasible.
|Commander||Karol J. Bobko|
|Pilot||Donald E. Williams|
|Mission Specialist 1||Margaret Rhea Seddon|
|Mission Specialist 2||S. David Griggs|
|Mission Specialist 3||Jeffrey A. Hoffman|
|Payload Specialist 1||Charles D. Walker|
|Payload Specialist 2||Jake Garn (U.S. Senator R-UT)|
|Garn was a Republican Senator from Utah acting as a congressional|
observer. He was the first sitting member of Congress in space.
- Hoffman and Griggs – EVA 1
- EVA 1 Start: April 16, 1985
- EVA 1 End: April 16, 1985
- Duration: 3 hours, 6 minutes
Crew seating arrangements
Seats 1–4 are on the Flight Deck. Seats 5–7 are on the Middeck.
During STS-51-D, the shuttle crew deployed two communications satellites: Telesat-I (Anik C1) and Syncom IV-3 (also known as Leasat-3); both were Hughes-built satellites. Telesat-I was attached to a Payload Assist Module (PAM-D) motor and successfully deployed. Syncom IV-3, however, failed to initiate antenna deployment and spin-up, or ignite its perigee kick motor upon deployment. The mission was consequently extended by two days to ensure that the satellite's spacecraft sequencer start lever was in its proper position. Griggs and Hoffman performed an unscheduled Extra-Vehicular Activity (EVA) to attach homemade "Flyswatter" devices to the shuttle's Remote Manipulator System (Canadarm). Seddon then engaged the satellite's start lever using the RMS, but again the post-deployment sequence did not begin. The satellite was subsequently retrieved, repaired and successfully redeployed during the STS-51-I mission later that year.
Discovery's other mission payloads included the Continuous Flow Electrophoresis System III (CFES-III), which was flying for sixth time; two Shuttle Student Involvement Program (SSIP) experiments; the American Flight Echo-cardiograph (AFE); two Getaway specials (GASs); a set of Phase Partitioning Experiments (PPE); an astronomical photography verification test; various medical experiments; and "Toys in Space", an informal study of the behavior of simple toys in a microgravity environment, with the results being made available to school students upon the shuttle's return.
During the shuttle's landing at KSC on 19 April 1985, extensive brake damage was suffered, and a landing gear tire ruptured. This prompted future shuttle flights to land at Edwards Air Force Base, California, until effective nose wheel steering could be implemented to reduce risks during landing.
NASA began a tradition of playing music to astronauts during the Project Gemini, and first used music to wake up a flight crew during Apollo 15. Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.
|Day 2||"Top of the World"||The Carpenters|
|Day 3||"Rescue Aid Society"||Song from the Disney film, The Rescuers|
Hoffman and Griggs attach the flyswatter device to the end of the Canadarm.
- "SATCAT". Jonathan's Space Report. Retrieved 24 March 2014.
- NASA. "STS-51D Press Kit" (PDF). Retrieved 16 December 2009. This article incorporates text from this source, which is in the public domain.
- "STS-51D". Spacefacts. Retrieved 26 February 2014.
- Walker, Charles D. (14 April 2005). "Oral History Transcript" (Interview). Interviewed by Johnson, Sandra. NASA Johnson Space Center Oral History Project.
|url=(help) This article incorporates text from this source, which is in the public domain.
- "STS-51D". NASA. 18 February 2010. Retrieved 16 January 2018. This article incorporates text from this source, which is in the public domain.
- Fries, Colin (25 June 2007). "Chronology of Wakeup Calls" (PDF). NASA. Retrieved 13 August 2007. This article incorporates text from this source, which is in the public domain.