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NASA-LLIS-0266
Lessons Learned - Seal Manufacturing Design and Inspection Error (Indirect Measurement of Critical Dimensions) Resulted in Material Yielding
Year: 1993
Abstract: Description of Driving Event:
A K-Seal drawing and manufacturing instruction specified measurement of inner and outer diameters, but no measurement of the K-Seal legs. Following the failure of a batch of seals during an Acceptance Test Procedure (ATP), an investigation revealed that they had all yielded and provided insufficient sealing forces. The yielding was caused by thin leg sections that occurred due to no direct measurement of leg thickness during manufacturing. Failure of this K-Seal could result in hot high pressure oxygen leakage during the orbiter launch phase with its associated hazards and also a lack of sufficient oxygen for external tank autogenous pressurization. Note: A drawing of the subject seal is available with the source documentation.
A K-Seal drawing and manufacturing instruction specified measurement of inner and outer diameters, but no measurement of the K-Seal legs. Following the failure of a batch of seals during an Acceptance Test Procedure (ATP), an investigation revealed that they had all yielded and provided insufficient sealing forces. The yielding was caused by thin leg sections that occurred due to no direct measurement of leg thickness during manufacturing. Failure of this K-Seal could result in hot high pressure oxygen leakage during the orbiter launch phase with its associated hazards and also a lack of sufficient oxygen for external tank autogenous pressurization. Note: A drawing of the subject seal is available with the source documentation.
Subject: Flight Equipment
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:10:35Z | |
| date available | 2017-09-04T17:10:35Z | |
| date copyright | 07/07/1993 | |
| date issued | 1993 | |
| identifier other | YPZCQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/134092 | |
| description abstract | Description of Driving Event: A K-Seal drawing and manufacturing instruction specified measurement of inner and outer diameters, but no measurement of the K-Seal legs. Following the failure of a batch of seals during an Acceptance Test Procedure (ATP), an investigation revealed that they had all yielded and provided insufficient sealing forces. The yielding was caused by thin leg sections that occurred due to no direct measurement of leg thickness during manufacturing. Failure of this K-Seal could result in hot high pressure oxygen leakage during the orbiter launch phase with its associated hazards and also a lack of sufficient oxygen for external tank autogenous pressurization. Note: A drawing of the subject seal is available with the source documentation. | |
| language | English | |
| title | NASA-LLIS-0266 | num |
| title | Lessons Learned - Seal Manufacturing Design and Inspection Error (Indirect Measurement of Critical Dimensions) Resulted in Material Yielding | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1993 | |
| contenttype | fulltext | |
| subject keywords | Flight Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware | |
| subject keywords | Safety & Mission Assurance |