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NASA-LLIS-1200
Lessons Learned – Improper Raising of Orbiter 103 Payload Bay Door Mishap
Year: 1990
Abstract: Description of Driving Event:
On June 4, 1990, in High Bay 1 of the Orbiter Processing Facility (OPF) at the Kennedy Space Center (KSC), the aft bridge of the Payload Bay Bridge and Hoist System was moved approximately 78 inches aft of its set position for Payload Bay Door (PLBD) operations. The right-hand PLBD Zero-G System was configured to support a scheduled PLBD closing operation on first shift, June 4, 1990, except the Zero-G weight baskets were left pinned to their weight cages. The right Payload Bay Door (PLBD) was supported by the Zero-G cabling (not pinned to the platform). Movement of the bridge put the Zero-G cabling into tension and at an angle sufficient to shear a portion of the weight basket pulley "V," fray the Zero-G cabling, move the weight basket off its track, and deflect the C-hook approximately 2 to 3 inches. Since the weight basket was pinned, the aft movement of the bridge also caused the right PLBD aft portion to rise approximately 31 to 33 inches (calculated).
On June 4, 1990, in High Bay 1 of the Orbiter Processing Facility (OPF) at the Kennedy Space Center (KSC), the aft bridge of the Payload Bay Bridge and Hoist System was moved approximately 78 inches aft of its set position for Payload Bay Door (PLBD) operations. The right-hand PLBD Zero-G System was configured to support a scheduled PLBD closing operation on first shift, June 4, 1990, except the Zero-G weight baskets were left pinned to their weight cages. The right Payload Bay Door (PLBD) was supported by the Zero-G cabling (not pinned to the platform). Movement of the bridge put the Zero-G cabling into tension and at an angle sufficient to shear a portion of the weight basket pulley "V," fray the Zero-G cabling, move the weight basket off its track, and deflect the C-hook approximately 2 to 3 inches. Since the weight basket was pinned, the aft movement of the bridge also caused the right PLBD aft portion to rise approximately 31 to 33 inches (calculated).
Subject: Configuration Management
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:23:19Z | |
| date available | 2017-09-04T15:23:19Z | |
| date copyright | 06/04/1990 | |
| date issued | 1990 | |
| identifier other | NEVEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/23531 | |
| description abstract | Description of Driving Event: On June 4, 1990, in High Bay 1 of the Orbiter Processing Facility (OPF) at the Kennedy Space Center (KSC), the aft bridge of the Payload Bay Bridge and Hoist System was moved approximately 78 inches aft of its set position for Payload Bay Door (PLBD) operations. The right-hand PLBD Zero-G System was configured to support a scheduled PLBD closing operation on first shift, June 4, 1990, except the Zero-G weight baskets were left pinned to their weight cages. The right Payload Bay Door (PLBD) was supported by the Zero-G cabling (not pinned to the platform). Movement of the bridge put the Zero-G cabling into tension and at an angle sufficient to shear a portion of the weight basket pulley "V," fray the Zero-G cabling, move the weight basket off its track, and deflect the C-hook approximately 2 to 3 inches. Since the weight basket was pinned, the aft movement of the bridge also caused the right PLBD aft portion to rise approximately 31 to 33 inches (calculated). | |
| language | English | |
| title | NASA-LLIS-1200 | num |
| title | Lessons Learned – Improper Raising of Orbiter 103 Payload Bay Door Mishap | en |
| type | standard | |
| page | 6 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1990 | |
| contenttype | fulltext | |
| subject keywords | Configuration Management | |
| subject keywords | Flight Equipment | |
| subject keywords | Flight Operations | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware | |
| subject keywords | Launch Process | |
| subject keywords | Mishap Reporting | |
| subject keywords | Parts Materials & Processes | |
| subject keywords | Payloads | |
| subject keywords | Spacecraft |