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NASA-LLIS-1226
Lessons Learned - Stripping of insulation from small-gauge wires
Year: 1998
Abstract: Description of Driving Event:
Qualification test failures of RM2679 transformers were discovered after vibration screening. Posttest analysis of the failed transformers revealed there were gaps between internal contacts. Further analysis revealed that wires had broken off where the transformer coil wire is soldered to larger terminals.
Root cause: Nicks were discovered on the coil winding wire near its attachment point. Further investigation determined that assembly personnel were using mechanical strippers to strip the coating off the ends of the wire. These nicks became stress concentrators leading to subsequent failure during vibration testing.
Qualification test failures of RM2679 transformers were discovered after vibration screening. Posttest analysis of the failed transformers revealed there were gaps between internal contacts. Further analysis revealed that wires had broken off where the transformer coil wire is soldered to larger terminals.
Root cause: Nicks were discovered on the coil winding wire near its attachment point. Further investigation determined that assembly personnel were using mechanical strippers to strip the coating off the ends of the wire. These nicks became stress concentrators leading to subsequent failure during vibration testing.
Subject: Flight Equipment
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:55:01Z | |
| date available | 2017-09-04T17:55:01Z | |
| date copyright | 36089 | |
| date issued | 1998 | |
| identifier other | FIVEQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/178164 | |
| description abstract | Description of Driving Event: Qualification test failures of RM2679 transformers were discovered after vibration screening. Posttest analysis of the failed transformers revealed there were gaps between internal contacts. Further analysis revealed that wires had broken off where the transformer coil wire is soldered to larger terminals. Root cause: Nicks were discovered on the coil winding wire near its attachment point. Further investigation determined that assembly personnel were using mechanical strippers to strip the coating off the ends of the wire. These nicks became stress concentrators leading to subsequent failure during vibration testing. | |
| language | English | |
| title | NASA-LLIS-1226 | num |
| title | Lessons Learned - Stripping of insulation from small-gauge wires | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1998 | |
| contenttype | fulltext | |
| subject keywords | Flight Equipment | |
| subject keywords | Ground Equipment | |
| subject keywords | Hardware | |
| subject keywords | Human Resources & Education | |
| subject keywords | Industrial Operations | |
| subject keywords | Parts Materials & Processes | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Test & Verification |