Space Shuttle Challenger (NASA Orbiter Vehicle Designation: OV-099) was NASAs second Space Shuttle orbiter to be put into service, Columbia (Space Shuttle Columbia) being the first. Its maiden flight was on April 4, 1983, and it completed nine missions before breaking apart 73 seconds after the launch of its tenth mission, STS-51-L on January 28, 1986, resulting in the death of all seven crew members (Space Shuttle Challenger disaster). The accident led to a two-and-a-half year grounding of the shuttle fleet, with missions resuming in 1988 with the launch of OV103 on STS-26. Challenger itself was replaced by the OV105, which first launched in 1992. Endeavour was constructed from spare parts originally meant for Challenger and the other shuttles in the fleet.