Russians may have found the cause of the Progress crash

[LongTomH]

Universe Today has been following the story of the failure of the recent failure of the Soyuz-U carrier rocket which caused the loss of the Progress spacecraft. Since the launch failure, NASA has said that it might have to return the International Space Station crew to Earth in November and operate the ISS in an unmanned mode.

The latest news is, that the cause of the carrier rocket failure may have been determined:

The Russian news agency Itar-Tass is reporting that the cause of the August 24 failure and crash of the Progress re-supply ship that was supposed to bring supplies to the International Space Station may have already been determined. “Members of the emergency commission have determined the cause of the failure of the Soyuz carrier rocket’s third stage engine,” Roscosmos spokesman Alexei Kuznetsov was quoted. “It is a malfunction in the engine’s gas generator.”

If the cause has indeed been found and if the anomaly can be resolved to the satisfaction of both Roscosmos and NASA, it might prevent a worst-case scenario of having to de-crew the International Space Station by mid-November, which NASA Space Station Program Manager Mike Suffredini said was a potential outcome.

Will the problem be fixed in time to allow the ISS to continue in a manned mode?

What actions will be taken to resolve the problem now that a cause may be established are not yet known. Suffredini said that two Soyuz-family unmanned rockets are scheduled to launch soon, which may provide a chance to test any fixes on unmanned launches before attempting a manned launch. A commercial Soyuz to launch a mobile communications satellites is scheduled on Oct. 8, and the Russians may launch the Progress resupply ship that is currently scheduled for October 26 a few weeks earlier in order to have another unmanned launch to study the problem.

The Progress cargo ships launch on a Soyuz-U rocket, while the Soyuz crew capsules, the Soyuz TMA launches on a Soyuz-FG. The third stages of the two rockets are virtually identical. The Soyuz-U rocket has had 745 successful launches and just 21 failures over nearly four decades. The Soyuz-FG has had 25 launches, all successful.