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NASA-LLIS-0125
Lessons Learned - Orbiter Compartment Overpressurization
Year: 1992
Abstract: Description of Driving Event:
The portable purge unit supplies conditioned air through ducts to the orbiter to purge and/or pressurize the payload bay's forward and aft compartments. Airflow varies between 50 lbs/min minimum to 100 lbs/min maximum. Vent door observers are always on station when a vent door is repositioned for a test or TPS tile/thermal barrier work. Overpressurization may occur if all the orbiter vent doors (normally in the purge position) for a compartment are closed at one time. Control logic program VAM09 also notifies the firing room engineers if both a right hand and left hand purge vent door set is closed.
The portable purge unit supplies conditioned air through ducts to the orbiter to purge and/or pressurize the payload bay's forward and aft compartments. Airflow varies between 50 lbs/min minimum to 100 lbs/min maximum. Vent door observers are always on station when a vent door is repositioned for a test or TPS tile/thermal barrier work. Overpressurization may occur if all the orbiter vent doors (normally in the purge position) for a compartment are closed at one time. Control logic program VAM09 also notifies the firing room engineers if both a right hand and left hand purge vent door set is closed.
Subject: Ground Operations
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:24:46Z | |
| date available | 2017-09-04T16:24:46Z | |
| date copyright | 08/21/1992 | |
| date issued | 1992 | |
| identifier other | TVYCQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/88024 | |
| description abstract | Description of Driving Event: The portable purge unit supplies conditioned air through ducts to the orbiter to purge and/or pressurize the payload bay's forward and aft compartments. Airflow varies between 50 lbs/min minimum to 100 lbs/min maximum. Vent door observers are always on station when a vent door is repositioned for a test or TPS tile/thermal barrier work. Overpressurization may occur if all the orbiter vent doors (normally in the purge position) for a compartment are closed at one time. Control logic program VAM09 also notifies the firing room engineers if both a right hand and left hand purge vent door set is closed. | |
| language | English | |
| title | NASA-LLIS-0125 | num |
| title | Lessons Learned - Orbiter Compartment Overpressurization | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Ground Operations | |
| subject keywords | Launch Vehicle |