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Columbia Accident Investigation Board


Columbia Accident Investigation Board

Columbia memorial in Arlington National Cemetery

The Columbia Accident Investigation Board (CAIB) was convened by NASA to investigate the destruction of the Space Shuttle Columbia during STS-107 upon atmospheric re-entry on February 1, 2003. The panel determined that the accident was caused by foam insulation breaking off from the shuttle, forming debris which damaged the wing; and that the problem of "debris shedding" was well known but considered "acceptable" by management. The panel also recommended changes that should be made to increase the safety of future shuttle flights. The CAIB released its final report on August 26, 2003.


  • Major findings 1
    • Immediate cause of the accident 1.1
    • Organizational cause of the accident 1.2
  • Board recommendations 2
  • Shuttle program after the CAIB report 3
  • Board members 4
    • Board support 4.1
    • Partial list of additional investigators and CAIB support staff 4.2
  • See also 5
  • References 6
  • Sources 7
  • External links 8

Major findings

The board found both the immediate physical cause of the accident and also what it called organizational causes.

Immediate cause of the accident

Close-up photo of left Bipod Foam Ramp

82 seconds after launch a large piece of foam insulating material, the "left bipod foam ramp", broke free from the external tank and struck the leading edge of the shuttle's left wing, damaging the protective carbon heat shielding panels.

During re-entry into the Earth's atmosphere, this damage allowed super-heated gases to enter and erode the inner wing structure which led to the destruction of Columbia. It was the seventh known instance of piece of foam, from this particular area of the external tank, breaking free during launch.[1]

Organizational cause of the accident

The problem of debris shedding from the external tank was well known and had caused shuttle damage on every prior shuttle flight. The damage was usually, but not always, minor. Over time, management gained confidence that it was an acceptable risk. NASA decided that it did not warrant an extra EVA for visual inspection, feeling that it would be like a car going down a highway and hitting a Styrofoam cooler.

Board recommendations

The board made 29 specific recommendations to NASA to improve the safety of future shuttle flights. These recommendations include:

  • Foam from external tank should not break free
  • Better pre-flight inspection routines
  • Increase quality of images available of shuttle during ascent and on-flight
  • Recertify all shuttle components by the year 2010
  • Establish an independent Technical Engineering Authority that is responsible for technical requirements and all waivers to them, and will build a disciplined, systematic approach to identifying, analyzing, and controlling hazards throughout the life cycle of the Shuttle System.

Only two further Space Shuttle missions were allowed to be flown before the implementation of these recommendations.

Shuttle program after the CAIB report

After the CAIB report came out, NASA implemented all recommended changes and flew its first post-Columbia mission in 2005. As part of the CAIB recommendations, the Shuttle carried a 50-foot inspection boom attached to the robot arm, which was used within 24 hours of launch to check the orbiter for damage. As all but one of the post-Columbia missions were concentrated on the International Space Station, primarily to provide a "safe haven" in the event an orbiter was damaged beyond the normal repair methods, NASA (smarting from a critical report that the STS-107 crew could have been rescued using the Space Shuttle Atlantis) implemented a STS-3xx contingency mission program that could launch a rescue orbiter on short notice, similar to the Skylab Rescue that was planned during the Skylab program.

NASA retired the Space Shuttle fleet on July 21, 2011 after completing the ISS and the final flight and subsequent landing of Space Shuttle Atlantis. The Shuttle's replacement, Orion, was to have consisted of an Apollo-derived spacecraft launched on the Ares I rocket, which would use a Space Shuttle Solid Rocket Booster as its first stage. Orion would not face the dangers of either an O-ring failure (due to the presence of a launch escape system[2]) or shedding foam (as the spacecraft would be launched in a stack configuration). In addition to ferrying crews to the ISS, the Orion spacecraft was to (as part of Project Constellation) allow NASA to return to the Moon.[3] President Obama signed the NASA Authorization Act 2010 on October 11 which officially brought the Constellation program to an end, replacing it with the Space Launch System (SLS) and Multi-Purpose Crew Vehicle (MPCV) programs to develop the launch vehicle and spacecraft to enable human exploration missions beyond low-Earth orbit.[4]

Board members

Chairman of the board

Board members

Board support

  • Ex Officio Member: Lt. Col. Michael J. Bloomfield, NASA Astronaut
  • Executive Secretary: Mr. Theron M. Bradley, Jr., NASA Chief Engineer

Partial list of additional investigators and CAIB support staff

  • Col Timothy Bair
  • Col. Jack Anthony
  • Dr. James P. Bagian
  • Lt. Col. Richard J. Burgess
  • Thomas L. Carter
  • Dr. Dwayne A. Day
  • Major Tracy Dillinger
  • Thomas L. Foster
  • CDR Mike Francis
  • Howard E. Goldstein
  • Lt. Col Patrick A. Goodman
  • Lt. Matthew E. Granger
  • Ronald K. Gress
  • Thomas Haueter
  • Dr. Daniel Heimerdinger
  • Dennis R. Jenkins
  • Christopher Kirchhoff
  • Dr. Gregory T. A. Kovacs
  • John F. Lehman
  • Jim Mosquera
  • Gary Olson
  • Gregory Phillips
  • David B. Pye
  • Lester A. Reingold
  • Donald J. Rigali
  • Dr. James. W. Smiley
  • G. Mark Tanner
  • Lt. Col. Wade J. Thompson
  • Dr. Edward Tufte[5]
  • Bob Vallaster
  • Dr. Diane Vaughan
  • Lt. Col. Donald J. White
  • Dr. Paul D. Wilde
  • LCDR Johnny R. Wolfe Jr.
  • Richard W. Russell
  • Dr. Robert E. Green, Jr.
  • Dr. Stuart E. Rogers
  • Dr. Reynaldo J. Gomez
  • Michael J. Aftosmis


See also


  1. ^ Accident Investigation Board, Report Volume 1, August 2003Columbia
  2. ^
  3. ^
  4. ^
  5. ^
  6. ^


  • CAIB panel and staff information Retrieved February 15, 2004
  • CAIB Final Report, Volume 1 (August 26, 2003)
  • STS-107 Investigation Reference Page
  • NASA SLS MPCV Retrieved April 30, 2011

External links

  • Columbia Accident Investigation Board homepage
  • CAIB hearing transcripts
  • NASA homepage
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