NASA-LLIS-2045
Lessons Learned – Failure of Pyrotechnic Operated Valves with Dual Initiators
active, Most Current
| Organization: | NASA |
| Publication Date: | 11 May 2009 |
| Status: | active |
| Page Count: | 3 |
scope:
Abstract:
Four spacecraft propulsion system pyrovalve no-fire failures were investigated by the NESC (NASA Engineering and Safety Center). In all four cases, a normally closed pyrovalve failed to actuate during tests in which simultaneous firing of dual initiators failed to ignite the booster charge. Timing of redundant initiator firings is crucial for reliable operation of pyrovalves. Dual simultaneous firing (less than 10 microseconds skew) is not as robust as a single firing and should be avoided.
Document History
NASA-LLIS-2045
May 11, 2009
Lessons Learned – Failure of Pyrotechnic Operated Valves with Dual Initiators
Abstract:
Four spacecraft propulsion system pyrovalve no-fire failures were investigated by the NESC (NASA Engineering and Safety Center). In all four cases, a normally closed pyrovalve failed to...
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