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Sea Launch Reports
Preliminary Findings
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Preliminary investigations by Sea Launch indicate
the off-nominal operation of the second stage propulsion system.
All other systems appear to have performed as expected. The
full Sea Launch Failure Review Oversight Board, with
representatives from customer companies as well as from the
satellite and aerospace industry, will review and validate the
results of each companies individual investigation to assess the
root cause of any anomalies and corrective action required.
A logic error in some ground
software appears to have failed to command a valve to close
in the second stage pneumatic system. This system performs several
functions, including operation and actuation for the steering
engine.  Data indicates this system had lost more than 60% of its
pressure.
Continued pressure loss reduced the capability of the en
gine, ultimately leading to a significant deviation in attitude,
triggering an
on-board automatic flight termination command to be issued
approximately 8 minutes after liftoff, near the end of the second
stage burn. Contrary to some news reports, good quality and
complete telemetry was received, during the entire flight phase,
through both the line-of-sight systems and the Tracking and Data
Relay Satellite System (TDRSS). A solid telemetry link was
maintained for 15 seconds after flight termination and
intermittent data was received for an additional 5 minutes. 
More information:
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