Does any of this have a familiar (O) ring?...
Joe
NASA managers came to an official decision that Discovery will be able to fly
 safely 'as-is' at last week's PRCB (Program Requirements Control  Board)
meeting at the Johnson Space Center.

A presentation, written  by Don McCorvey, NASA Flight Controls Subsystem
Manager and Trent Kit, from NASA  Safety, came to the conclusion that a 'lack of
documented failure history' along  with 'robust hardware design' mitigated most
of the concerns - concerns that has  resurfaced following evaluations and
testing by the Aerospace  Corporation.
Those concerns were outlined at the start of a fascinating 26  page document,
that didn't mince its words.
"'The flight rationale currently proposed that would allow  flight 'as is' of
critical Flight Control System (FCS) avionics boxes suspected  of whisker
infestation cannot be validated with the available data and,  therefore, is not
acceptable for flight," opened the Executive  Summary.

"Catastrophic impacts for tin whisker generated failures puts  not only the
Orbiter at risk, but also potentially the International Space  Station and the
crew for both vehicles."

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