| 41. | The Columbia Accident Investigation Board issued 15 recommendations NASA is working to meet.
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| 42. | The Columbia Accident Investigation Board conducted the heat shield tests recently in San Antonio.
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| 43. | Columbia Accident Investigation Board : http : / / www . caib . us
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| 44. | Air Accident Investigation Branch officials are investigating how the accident occurred, the spokeswoman said.
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| 45. | The Columbia Accident Investigation Board said in its report that the ASAP lacked influence.
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| 46. | Columbia accident investigation board : http : / / www . caib . us
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| 47. | The debris would be handed over to Civil Aviation Accident Investigation Commission, he added.
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| 48. | Brooks, who recently completed a Navy course on accident investigations.
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| 49. | In fact, air accident investigations can take years to complete.
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| 50. | The National Transportation Safety Board convened an accident investigation team.
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