[No.]: 14
[Date]: 2001-01-02
[Orbiter]: Atlantis
[Mission]: STS-98
[Reason]: Crawler failure
[Description]: Atlantis began rollout to Launch Pad 39A, but an hour later stopped on the crawler path so engineers could troubleshoot a failed computer processor on the crawler transporter. Troubleshooting efforts were unsuccessful, the shuttle was returned to the VAB using a secondary computer processor.[No.]: 12
[Date]: 1996-09-04
[Orbiter]: Atlantis
[Mission]: STS-79
[Reason]: Weather
[Description]: Atlantis was moved back to the VAB due to threat of severe weather from Hurricane Fran.[No.]: 3
[Date]: 1985-03-05
[Orbiter]: Challenger
[Mission]: STS-51-ESTS-51-B
[Reason]: Payload
[Description]: Challenger was rolled back from Pad 39A due to a timing problem with the primary payload, the Tracking and Data Relay Satellite-B (TDRS-B). The vehicle was de-stacked in the VAB and the orbiter returned to Orbiter Processing Facility. The mission, STS-51E, was canceled and the orbiter was re-manifested with 51-B payloads.[No.]: 20
[Date]: 2010-12-17
[Orbiter]: Discovery
[Mission]: STS-133
[Reason]: External tank repairs
[Description]: Discovery rolled off the launch pad after insulating foam and two structural stringers on the external tank cracked during a launch attempt on November 5, 2010. The repair effort lasted two months as engineers beefed up the structural integrity of the structural members in question and replaced the foam that was removed to facilitate those repairs. The mission lifted off on February 24, 2011. The external tank performed flawlessly during fueling and launch.[No.]: 7
[Date]: 1991-03-07
[Orbiter]: Discovery
[Mission]: STS-39
[Reason]: Inspection failure
[Description]: Discovery was rolled back to the VAB after significant cracks were found on all four lug hinges on the two external tank umbilical door drive mechanisms.[No.]: 13
[Date]: 1999-05-16
[Orbiter]: Discovery
[Mission]: STS-96
[Reason]: Inspection failure
[Description]: Discovery was moved back to the VAB to repair hail damage to the external tank foam insulation.
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