STS-51D

**STS-51D**
Organization	NASA-Office of Space Flight (United States)
Mission type	Human Crew
Launch date	April 12, 1985
Launch vehicle	Space Shuttle
Launch site	Cape Canaveral, United States
COSPAR ID	1985-028A
Inclination	28.45 degrees
Experiments	Here
Alternate Names	STS 16,15641
Additional Information	Here
Data Collection	Here
Payload Mass Up	16228 kg
Payload Mass Down	6021.82 kg
Orbiter	Discovery
Lift Off Mass	2,047,838.64 kg
Orbiter Weight at Liftoff	114,041.36 kg
Orbiter Weight at Landing	90,006.36 kg
Landed	Runway 33 at Kennedy Space Center, Fla.
Orbits of Earth	109
Orbital Altitude	248 nautical miles (285 statute miles)

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[edit] Crew

Commander: Karol J. Bobko
Pilot: Donald E. Williams
- Payload Commander:
- Mission Specialist 1: Jeffrey A. Hoffman
- Mission Specialist 2: S. David Griggs
- Mission Specialist 3: Margaret Rhea Seddon
- Mission Specialist 4:
- Mission Specialist 5:
- Payload Specialist 1: Charles D. Walker (as industrial payload specialist representing McDonnell Douglas Corp.)
- Payload Specialist 2: Senator Jake Garn (Utah)

ISS/Mir Crew Transport

[edit] Mission

STS 51-D was the fourth Discovery shuttle flight. On board were Karol Bobko, Donald Williams, Rhea Seddon, David Griggs, Jeffrey Hoffman, Charles Walker and US Senator Jake Garn. During this mission, the TELESAT-l (ANIK C-1) communications satellite was deployed, attached to Payload Assist Module (PAM-D) motor. SYNCOM IV-3 (also known as LEASAT-3) was deployed, but spacecraft sequencer failed to initiate antenna deployment, spin up and ignition of perigee kick motor. The mission was extended two days to make certain sequencer start lever in proper position. Griggs and Hoffman performed a space walk to attach Flyswatter devices to thr remote manipulator system. Seddon engaged LEASAT lever using remote manipulator system but post deployment sequence did not begin. Other payloads included: Continuous Flow Electrophoresis System (CFES) III, flying for sixth time; two Shuttle Student Involvement Program (SSIP) experiments; American Flight Echocardiograph (AFE); two Get Away Specials; Phase Partitioning Experiments (PPE); astronomy Photography verification test; medical experiments and `toys in space', an informal study of the behavior of simple toys in weightless environment, with results to be made available to school students. Mission duration was 167 hours 55 minutes 23 seconds.

[edit] EVA

Extravehicular Activity (EVA) conducted by Jeffrey Hoffman and David Griggs, 3 hours, 10 minutes.

[edit] Payload

Telesat (Canada communications satellite)-I with Payload Assist Module (PAM)-D deployment; Syncom IV-3 communications satellite deployment with its unique stage (unique stage failed to ignite); Continuous Flow Electrophoresis (CFES); Phase Partitioning Experiment (PPE); student experiments, two getaway specials (GAS); informal science studies (Toys in Space)

Mission patch: