NASA - National Aeronautics and Space Administration

Discovery (OV-103) was NASA's third space shuttle orbiter to join the fleet, arriving for the first time at the Kennedy Space Center in Florida in November 1983.

After checkout and processing, it was launched on Aug. 30, 1984, for its first mission, 41-D, to deploy three communications satellites.

Since that inaugural flight, Discovery has completed more than 30 successful missions, surpassing the number of flights made by any other orbiter in NASA's fleet. Just like all of the orbiters, it has undergone some major modifications over the years. The most recent began in 2002 and was the first carried out at Kennedy. It provided 99 upgrades and 88 special tests, including new changes to make it safer for flight.

Image left: Space Shuttle Discovery lifts off Pad B at the Kennedy Space Center on September 12, 1993, to begin STS-51. Image credit: NASA

Discovery has the distinction of being chosen as the Return to Flight orbiter twice. The first was for STS-26 in 1988, and the second when it carried the STS-114 crew on NASA's Return to Flight mission to the International Space Station in July 2005.

The choice of the name "Discovery" carried on a tradition drawn from some historic, Earth-bound exploring ships of the past. One of these sailing forerunners was the vessel used in the early 1600s by Henry Hudson to explore Hudson Bay and search for a northwest passage from the Atlantic to the Pacific.

Another such ship was used by British explorer James Cook in the 1770s during his voyages in the South Pacific, leading to the discovery of the Hawaiian Islands. In addition, two British Royal Geographical Society ships have carried the name "Discovery" as they sailed on expeditions to the North Pole and the Antarctic.

Destined for exploring the heavens instead of the seas, it was only fitting that NASA's Discovery carried the Hubble Space Telescope into space during mission STS-31 in April 1990, and provided both the second and third Hubble servicing missions (STS-82 in February 1997 and STS-103 in December 1999).

Image right: On February 21, 1997, the Space Shuttle Discovery touches down in darkness on Runway 15 of the KSC Shuttle Landing Facility, bringing to a close the 10-day STS-82 mission to service the Hubble Space Telescope (HST). Image credit: NASA

During its many successful trips to space, Discovery has carried satellites aloft, ferried modules and crew to the International Space Station, and provided the setting for countless scientific experiments.

Construction Milestones

January 29, 1979	Contract Award
August 27, 1979	Start long lead fabrication of Crew Module
June 20, 1980	Start fabrication lower fuselage
November 10, 1980	Start structural assembly of aft-fuselage
December 8, 1980	Start initial system installation aft fuselage
March 2, 1981	Start fabrication/assembly of payload bay doors
October 26, 1981	Start initial system installation, crew module, Downey
January 4, 1982	Start initial system installation upper forward fuselage
March 16, 1982	Midfuselage on dock, Palmdale
March 30, 1982	Elevons on dock, Palmdale
April 30, 1982	Wings arrive at Palmdale from Grumman
April 30, 1982	Lower forward fuselage on dock, Palmdale
July 16, 1982	Upper forward fuselage on dock, Palmdale
August 5, 1982	Vertical stabilizer on dock, Palmdale
September 3, 1982	Start of Final Assembly
October 15, 1982	Body flap on dock, Palmdale
January 11, 1983	Aft fuselage on dock, Palmdale
February 25, 1983	Complete final assembly and closeout installation, Palmdale
February 28, 1983	Start initial subsystems test, power-on, Palmdale
May 13, 1983	Complete initial subsystems testing
July 26, 1983	Complete subsystems testing
August 12, 1983	Completed Final Acceptance
October 16, 1983	Rollout from Palmdale
November 5, 1983	Overland transport from Palmdale to Edwards
November 9, 1983	Delivery to Kennedy Space Center
June 2, 1984	Flight Readiness Firing
August 30, 1984	First Flight (41-D)

Upgrades and Features

Discovery benefited from lessons learned in the construction and testing of Enterprise, Columbia and Challenger. At rollout, its weight was some 6,870 pounds less than Columbia.

Beginning in the fall of 1995, the orbiter underwent a nine-month Orbiter Maintenance Down Period (OMDP) in Palmdale California. The vehicle was outfitted with a 5th set of cryogenic tanks and an external airlock to support missions to the International Space Station. It returned to the Kennedy Space Center, riding piggy-back on a modified Boeing 747, in June 1996.

Following STS-105, Discovery became the first of the orbiter fleet to undergo Orbiter Major Modification (OMM) period at the Kennedy Space Center. Work began in September 2002, and along with the scheduled upgrades, additional safety modifications were added as part of the preparations for Return to Flight.

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