ISS Program Manager Mike Suffredini briefed the NASA Advisory Council’s Human Exploration and Operations Committee on Wednesday, Marcia Smith reports. The anomalies on the first commercial cargo mission included:
- One of three flight computers failed while Dragon was docked at ISS due to a suspected radiation hit.
The computer was restarted but could not re-synchronize with the other two units.The computer was restarted but was not resynchronized with the other two units. SpaceX says that NASA felt it was not necessary to continue the mission.
- One of three GPS units, the Propulsion and Trunk computers and Ethernet switch also experienced suspected radiation hits, but they were recovered during a power cycle.
- All three coolant pumps failed after splashdown in the Pacific Ocean.
- Glacier freezer was at -65 degrees Centigrade (C) instead of the planned -95 degrees C when it was opened three hours after splashdown, causing some samples to exceed temperature limits.
- Problems occurred with one of the Dragon’s Draco thrusters.
Suffredini said SpaceX is still looking for the cause of a sudden drop in pressure that caused one of the Falcon 9’s Merlin engines to fail. NASA is participating in the investigation.
SpaceX’s next cargo mission to ISS is set for March 2013. A delay is possible depending upon the outcome of the investigation into the engine failure.