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NASA-LLIS-0486
Lessons Learned - Conduct Post Test Examination of Lot Acceptance Hardware for Incipient Failures (1993)
Year: 1996
Abstract: Abstract:
During lot acceptance test of ten Mars Observer pyro valves, none failed. Yet, post-test examination showed that each of these valves had sustained erosion (burning) of about 50 percent of their threads. A study showed that some firings result in the pyro being ejected from the valve body at speeds of approximately 200 m/s, which could damage critical hardware.
Users of NSIs should be alerted to this possibility. Acceptance or qualification testing should include post-test examination of inferred margin or incipient failure modes. The use of titanium in pyrotechnic applications should be avoided.
During lot acceptance test of ten Mars Observer pyro valves, none failed. Yet, post-test examination showed that each of these valves had sustained erosion (burning) of about 50 percent of their threads. A study showed that some firings result in the pyro being ejected from the valve body at speeds of approximately 200 m/s, which could damage critical hardware.
Users of NSIs should be alerted to this possibility. Acceptance or qualification testing should include post-test examination of inferred margin or incipient failure modes. The use of titanium in pyrotechnic applications should be avoided.
Subject: Energetic Materials - Explosive/Propellant/Pyrotechnic
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:10:48Z | |
| date available | 2017-09-04T15:10:48Z | |
| date copyright | 35418 | |
| date issued | 1996 | |
| identifier other | AQBEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/9168 | |
| description abstract | Abstract: During lot acceptance test of ten Mars Observer pyro valves, none failed. Yet, post-test examination showed that each of these valves had sustained erosion (burning) of about 50 percent of their threads. A study showed that some firings result in the pyro being ejected from the valve body at speeds of approximately 200 m/s, which could damage critical hardware. Users of NSIs should be alerted to this possibility. Acceptance or qualification testing should include post-test examination of inferred margin or incipient failure modes. The use of titanium in pyrotechnic applications should be avoided. | |
| language | English | |
| title | NASA-LLIS-0486 | num |
| title | Lessons Learned - Conduct Post Test Examination of Lot Acceptance Hardware for Incipient Failures (1993) | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1996 | |
| contenttype | fulltext | |
| subject keywords | Energetic Materials - Explosive/Propellant/Pyrotechnic | |
| subject keywords | Flight Equipment | |
| subject keywords | Hardware | |
| subject keywords | Spacecraft | |
| subject keywords | Test & Verification |