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After landing and during rollout, medium large transport aircraft would not depressurize. Flight crew manually operated exhaust valve to depressurize aircraft.
| Attributes | |
| ACN | 163304 |
| Time | |
| Date | 199011 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : msy |
| State Reference | LA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 187 flight time total : 13150 flight time type : 468 |
| ASRS Report | 163304 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Aircraft failed to depressurize after landing upon switching from flight to ground. Had to use manual dc to equalize cabin to airport elevation as aircraft was still pressurized to 4 psi differential. Tried to be smooth depressurizing but may have caused some ear discomfort. Maintenance found AC electrical contacts to outflow valve were malfunctioning.
Original NASA ASRS Text
Title: AFTER LNDG AND DURING ROLLOUT, MLG ACFT WOULD NOT DEPRESSURIZE. FLT CREW MANUALLY OPERATED EXHAUST VALVE TO DEPRESSURIZE ACFT.
Narrative: ACFT FAILED TO DEPRESSURIZE AFTER LNDG UPON SWITCHING FROM FLT TO GND. HAD TO USE MANUAL DC TO EQUALIZE CABIN TO ARPT ELEVATION AS ACFT WAS STILL PRESSURIZED TO 4 PSI DIFFERENTIAL. TRIED TO BE SMOOTH DEPRESSURIZING BUT MAY HAVE CAUSED SOME EAR DISCOMFORT. MAINT FOUND AC ELECTRICAL CONTACTS TO OUTFLOW VALVE WERE MALFUNCTIONING.
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.