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NASA-LLIS-0215
Lessons Learned - Solid Rocket Motor (SRM) Processing and Inspection
Year: 1992
Abstract: Description of Driving Event:
All inventory SRM case o-rings were reinspected during the STS 51-L investigation. When reinspected using original inspection equipment (mechanical micrometer), very few out-of-tolerance conditions were identified. However, when reinspected with a laser micrometer with a 0.007-inch measuring beam, numerous small localized out-of-tolerance conditions were detected. All inventory o-rings were also x-rayed, indicating numerous o-ring inclusions. Although tests proved that these conditions did not affect the sealing capability, this does indicate a potential problem and a need for processing and inspection improvements. It was also learned during this investigation that the o-ring material manufacturer had changed material formulations and processing numerous times since starting to produce srm o-ring material. While all these formulations resulted in o-ring material that was in compliance with MIL-R-83248, this lack of standardization could possibly result in application problems and is unacceptable for such a critical item
All inventory SRM case o-rings were reinspected during the STS 51-L investigation. When reinspected using original inspection equipment (mechanical micrometer), very few out-of-tolerance conditions were identified. However, when reinspected with a laser micrometer with a 0.007-inch measuring beam, numerous small localized out-of-tolerance conditions were detected. All inventory o-rings were also x-rayed, indicating numerous o-ring inclusions. Although tests proved that these conditions did not affect the sealing capability, this does indicate a potential problem and a need for processing and inspection improvements. It was also learned during this investigation that the o-ring material manufacturer had changed material formulations and processing numerous times since starting to produce srm o-ring material. While all these formulations resulted in o-ring material that was in compliance with MIL-R-83248, this lack of standardization could possibly result in application problems and is unacceptable for such a critical item
Subject: Launch Vehicle
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:42:39Z | |
| date available | 2017-09-04T15:42:39Z | |
| date copyright | 33926 | |
| date issued | 1992 | |
| identifier other | PJZCQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/44904 | |
| description abstract | Description of Driving Event: All inventory SRM case o-rings were reinspected during the STS 51-L investigation. When reinspected using original inspection equipment (mechanical micrometer), very few out-of-tolerance conditions were identified. However, when reinspected with a laser micrometer with a 0.007-inch measuring beam, numerous small localized out-of-tolerance conditions were detected. All inventory o-rings were also x-rayed, indicating numerous o-ring inclusions. Although tests proved that these conditions did not affect the sealing capability, this does indicate a potential problem and a need for processing and inspection improvements. It was also learned during this investigation that the o-ring material manufacturer had changed material formulations and processing numerous times since starting to produce srm o-ring material. While all these formulations resulted in o-ring material that was in compliance with MIL-R-83248, this lack of standardization could possibly result in application problems and is unacceptable for such a critical item | |
| language | English | |
| title | NASA-LLIS-0215 | num |
| title | Lessons Learned - Solid Rocket Motor (SRM) Processing and Inspection | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Launch Vehicle | |
| subject keywords | Parts Materials & Processes |