STS-9 Columbia Oct. 19, 1983

Columbia was rolled back from Pad 39A to the VAB, de-stacked, and the orbiter returned to the Orbiter Processing Facility because of a suspect exhaust nozzle on the right solid rocket booster.

STS 41-D Discovery July 11, 1984

Discovery was rolled back from Pad 39A to the VAB following a pad abort on June 26. The vehicle was returned to the VAB, de-stacked, and the orbiter returned to the Orbiter Processing Facility to remove and replace the number three main engine which caused the abort.

STS 51-E/51-B Challenger March 5, 1985

Challenger was rolled back from Pad 39A due to a timing problem with the primary payload, the Tracking and Data Relay Satellite-B. The vehicle was de-stacked in VAB and the orbiter returned to Orbiter Processing Facility. This mission, 51-E, was cancelled and the orbiter re-manifested with 51-B payloads.

STS-35 Columbia June 12, 1990 1st rollback

Columbia was rolled back twice during preparations for mission STS-35. The first time was from Pad 39A after a hydrogen leak was detected in the external tank/orbiter 17-inch umbilical.

STS-38 Atlantis Aug. 9, 1990

Atlantis was rolled back from Pad 39A to the VAB after tests confirmed a hydrogen fuel leak on the external tank side of the external tank/orbiter 17-inch quick disconnect umbilical. The vehicle was de-stacked.

STS-35 Columbia Oct. 9, 1990 2nd rollback

Columbia was rolled back a second time due to the threat of severe weather from Tropical Storm Klaus. The second rollback was from Pad 39B

STS-39 Discovery March 7, 1991

Discovery rolled back from Pad 39A to the VAB after significant cracks were found on all four lug hinges on the two external tank umbilical door drive mechanisms. The vehicle was destacked.

STS-68 Endeavour Aug. 24, 1994

Endeavour was rolled back from Pad 39A to the VAB after a pad abort due to an unacceptably high discharge temperature in the high-pressure oxidizer turbo pump on main engine number three. All three engines were replaced in the VAB.

STS-70 Discovery June 8, 1995

Discovery was rolled back from Pad 39B to the VAB after Yellow Flicker Woodpeckers drilled about 195 holes on the external tank foam insulation, many of which were too high up on the tank to be accessed at the pad for repairs.

STS-69 Endeavour Aug. 1, 1995

Endeavour was rolled back from Pad 39A to the VAB due to the threat of severe weather from Hurricane Erin which passed through Brevard County where the Kennedy Space Center is located.

STS-79 Atlantis July 10, 1996

Atlantis was rolled back from Pad 39A to the VAB due to the threat of severe weather from Hurricane Bertha.

STS-79 Atlantis Sept. 4, 1996

Atlantis was rolled back from Pad 39A to the VAB due to the threat of severe weather from Hurricane Fran.

STS-96 Discovery May 16, 1999

Discovery was rolled back from Pad 39B to the VAB to repair hail damage to the external tank foam insulation.

STS-98 Atlantis Jan. 2, 2001 1st rollback

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, so managers decided to roll Atlantis back into VAB high bay 3 using a secondary computer processor.

STS-98 Atlantis Jan. 19, 2001 2nd rollback

Atlantis was rolled back from Pad 39A to the VAB due to uncertainty involving the integrity of the SRB cables.

STS-114 Discovery May 26, 2005

Discovery was rolled back from Pad 39B in order to get a new, modified external fuel tank in preparation for the Return to Flight mission.

STS-115 Atlantis Aug. 29, 2006 Partial rollback

Atlantis began rolling back from Pad 39B to the VAB due to the threat of severe weather from Tropical Storm Ernesto, but weather advisories throughout the day showed that the storm was progressively weakening. Given the improvements in Ernesto's projected path and intensity, NASA chose to reverse the rollback decision and return the shuttle assembly to Launch Pad 39B.

STS-125 Atlantis Oct. 20, 2008

Atlantis rolled back from Pad 39A to the VAB to allow time to troubleshoot a problem with the Hubble Space Telescope on orbit. Hardware to correct the problem will be added to the STS-125 mission payload.

STS-133 Discovery Dec. 21, 2010