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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Aircraft cabin failed to maintain pressurization, and an emergency descent was initiated by the flight crew. The equipment problem was temporarily resolved, and the flight continued to the final destination at a lower flight level.
| Attributes | |
| ACN | 296659 |
| Time | |
| Date | 199502 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pit |
| State Reference | PA |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : sfo |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 90 flight time total : 6000 flight time type : 800 |
| ASRS Report | 296659 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
On preflight, noticed some water dripping from aft lavatory drain, after water service (normal action after water service). In-flight (cruise), noticed cabin altitude climbing past 10000 ft, with altitude horn. Closing cabin outflow valve did not stop cabin climb. Began an emergency descent (approved by ATC). Regained cabin at FL220, and final leveloff at FL180. Continued on to dayton. At dayton maintenance determined water line had cracked and water had frozen on outflow valve and would not allow it to close. Perhaps more care is needed in aircraft water service.
Original NASA ASRS Text
Title: ACFT CABIN FAILED TO MAINTAIN PRESSURIZATION, AND AN EMER DSCNT WAS INITIATED BY THE FLC. THE EQUIP PROB WAS TEMPORARILY RESOLVED, AND THE FLT CONTINUED TO THE FINAL DEST AT A LOWER FLT LEVEL.
Narrative: ON PREFLT, NOTICED SOME WATER DRIPPING FROM AFT LAVATORY DRAIN, AFTER WATER SVC (NORMAL ACTION AFTER WATER SVC). INFLT (CRUISE), NOTICED CABIN ALT CLBING PAST 10000 FT, WITH ALT HORN. CLOSING CABIN OUTFLOW VALVE DID NOT STOP CABIN CLB. BEGAN AN EMER DSCNT (APPROVED BY ATC). REGAINED CABIN AT FL220, AND FINAL LEVELOFF AT FL180. CONTINUED ON TO DAYTON. AT DAYTON MAINT DETERMINED WATER LINE HAD CRACKED AND WATER HAD FROZEN ON OUTFLOW VALVE AND WOULD NOT ALLOW IT TO CLOSE. PERHAPS MORE CARE IS NEEDED IN ACFT WATER SVC.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.