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  • [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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About This Tool

Rollbacks are the terminology used by NASA to roll the shuttle back from the mobile launch pad and the launch pad on top of the tracked Vehicle Assembly Building. If the aircraft is unable to launch due to bad weather or other reasons, many factors may need to roll back. Rollback times like this have occurred many times in history, and the tool only randomly selected 20 of them to introduce.

In the generator, we can see the exact beginning and end of the rollback times of these buses. It includes the detailed date of the rollback, the Orbiter, the tasks to be completed, the reason for the rollback, and the main description of the rollback at the time. In summary, rollback is most likely due to Inspection failure, Weather, Abort, Fuel leak, Payload, External tank repairs, and several other major causes affecting the actual time of launch.

Click the "Display All Items" button and you will get a list of Space Shuttle rollbacks.

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