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Last updated on April 23, 2014 at 21:24 EDT

STS-51-C

Discovery launched from Kennedy Space Center on January 24, 1985 at 2:50 PM EST and landed at Kennedy on January 27 at 4:23 PM EST. The shuttle orbited 49 times at an altitude of 220 nautical miles and an inclination of 28.5 degrees and travelled 1.3 million miles. The mission lasted 3 days, 1 hour, 33 minutes, and 23 seconds.

The launch scheduled for January 23 was scrubbed due to freezing weather conditions. (Orbiter Challenger was scheduled for Mission 51-C but thermal tile problems forced the substitution of Discovery.)

The countdown phase was completed, however, two minor orbiter problems were noted during that period. The first occurred during the T-3 hour hold and involved a force fight in the right inboard elevon actuator between channel 4 and channels 1, 2, and 3. The condition corrected itself within 22 seconds after the Auxiliary Power Unit (APU) start up at T-5 minutes. A similar problem with the same channels in the same actuator occurred on STS 41-D (the first flight of this vehicle).

The second problem that was noted during the countdown phase was the high helium concentration in the orbiter mid-body. A pressure decay test showed no significant system leakage. The high helium concentration disappeared when the main propulsion system (MPS) gaseous helium system was pressurized to the flight level.

System operations were all nominal during the ascent phase. Solid rocket booster (SRB) motor performance was near the predicted levels and well within the allowed envelopes. The external tank and MPS performance was excellent with main engine cutoff (MECO) near the predicted time.

At external tank separation, the backup flight system (BFS) did not automatically proceed to major mode 104. The crew performed the necessary manual procedures, and the BFS operated satisfactorily until the deorbit maneuver when the BFS time for deorbit maneuver ignition was 8 seconds late. However, the BFS operated satisfactorily for entry.

Discovery was crewed by Commander Thomas K. Mattingly, Pilot Loren J. Shriver, Mission Specialists Ellison S. Onizuka, and James F. Buchli, and Payload Specialist Gary E. Payton.

STS-51-C