NASA Independent Review Team SpaceX CRS-7 Accident Investigation Report Public Summary
"The SpX CRS-7 mission consisted of a SpaceX Falcon 9 version 1.1 launch vehicle and a Dragon spacecraft loaded with 4303 lbs (1952 kgs) of cargo. At approximately 139 seconds into flight, the launch vehicle experienced an anomalous event in the upper stage liquid oxygen (LOx) tank, resulting in the loss of the mission. The first stage of the vehicle, including all nine Merlin 1D engines, operated nominally. The Dragon spacecraft also indicated no anomalous behavior prior to the mishap, and survived the second stage event, continuing to communicate with ground controllers until it dropped below the horizon."
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