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NASA-LLIS-1101
Lessons Learned – Hardware losses during STS-88 Extravehicular Activities (EVAs, also known as space walks)
Year: 2001
Abstract: Description of Driving Event:
Several items of EVA hardware were lost during the EVAs on STS-88. Impact to immediate mission is loss of availability of needed tools. Lost tooling, when unretrieved, also adds to on orbit debris.
• The flight support equipment (FSE) for the EVA installable slidewire and an on-orbit installed worksite interface (OIWIF) with an attached retractable tether were lost on EVA1.
• One of the trunnion pin covers was lost on EVA2.
• Two of the safety tether hook guards were also lost during the EVAs.
There is no identified common hardware cause for the lost hardware. The EVA Project Office chartered a team to investigate the issue and make recommendations for corrective action.
Root cause:
• Slidewire Carrier - inconclusive, most probable cause is inadvertent opening of Tool Stanchion bayonet.
• On orbit installed WIF/retractable tether - inconclusive, most probable cause was the hardware was tethered to another end item and was released when that end item was removed from the mini workstation.
• Trunnion pin cover - was not properly tethered due to a lack of a tether loop on the mockup/ trainer.
• Tether hook clips - inadequate restraint in design.
Several items of EVA hardware were lost during the EVAs on STS-88. Impact to immediate mission is loss of availability of needed tools. Lost tooling, when unretrieved, also adds to on orbit debris.
• The flight support equipment (FSE) for the EVA installable slidewire and an on-orbit installed worksite interface (OIWIF) with an attached retractable tether were lost on EVA1.
• One of the trunnion pin covers was lost on EVA2.
• Two of the safety tether hook guards were also lost during the EVAs.
There is no identified common hardware cause for the lost hardware. The EVA Project Office chartered a team to investigate the issue and make recommendations for corrective action.
Root cause:
• Slidewire Carrier - inconclusive, most probable cause is inadvertent opening of Tool Stanchion bayonet.
• On orbit installed WIF/retractable tether - inconclusive, most probable cause was the hardware was tethered to another end item and was released when that end item was removed from the mini workstation.
• Trunnion pin cover - was not properly tethered due to a lack of a tether loop on the mockup/ trainer.
• Tether hook clips - inadequate restraint in design.
Subject: Extra-Vehicular Activity
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:03:33Z | |
| date available | 2017-09-04T16:03:33Z | |
| date copyright | 01/01/2001 | |
| date issued | 2001 | |
| identifier other | RQUEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/66806 | |
| description abstract | Description of Driving Event: Several items of EVA hardware were lost during the EVAs on STS-88. Impact to immediate mission is loss of availability of needed tools. Lost tooling, when unretrieved, also adds to on orbit debris. • The flight support equipment (FSE) for the EVA installable slidewire and an on-orbit installed worksite interface (OIWIF) with an attached retractable tether were lost on EVA1. • One of the trunnion pin covers was lost on EVA2. • Two of the safety tether hook guards were also lost during the EVAs. There is no identified common hardware cause for the lost hardware. The EVA Project Office chartered a team to investigate the issue and make recommendations for corrective action. Root cause: • Slidewire Carrier - inconclusive, most probable cause is inadvertent opening of Tool Stanchion bayonet. • On orbit installed WIF/retractable tether - inconclusive, most probable cause was the hardware was tethered to another end item and was released when that end item was removed from the mini workstation. • Trunnion pin cover - was not properly tethered due to a lack of a tether loop on the mockup/ trainer. • Tether hook clips - inadequate restraint in design. | |
| language | English | |
| title | NASA-LLIS-1101 | num |
| title | Lessons Learned – Hardware losses during STS-88 Extravehicular Activities (EVAs, also known as space walks) | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2001 | |
| contenttype | fulltext | |
| subject keywords | Extra-Vehicular Activity | |
| subject keywords | Flight Equipment | |
| subject keywords | Hardware | |
| subject keywords | Human Factors | |
| subject keywords | Policy & Planning | |
| subject keywords | Risk Management/Assessment | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Spacecraft | |
| subject keywords | Training Equipment |