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Air carrier medium large transport cabin pressurization problem. Emergency declared to get lower altitude.
| Attributes | |
| ACN | 122150 |
| Time | |
| Date | 198909 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ind |
| State Reference | IN |
| Altitude | msl bound lower : 31000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 17000 flight time type : 1100 |
| ASRS Report | 122150 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Cabin rate of climb started up approximately 500 FPM. Turned off engine anti-ice and tried manually to stop it. Could not close outflow valve and checked pack pressure. Both were working, could not stop it. Started descent to 31,000'. When cabin went to 10,000' in descent we declared an emergency to get lower. Ind was below landing min. We diverted to fwa. The cabin did not get high enough to drop the masks.
Original NASA ASRS Text
Title: ACR MLG CABIN PRESSURIZATION PROBLEM. EMERGENCY DECLARED TO GET LOWER ALT.
Narrative: CABIN RATE OF CLIMB STARTED UP APPROX 500 FPM. TURNED OFF ENGINE ANTI-ICE AND TRIED MANUALLY TO STOP IT. COULD NOT CLOSE OUTFLOW VALVE AND CHECKED PACK PRESSURE. BOTH WERE WORKING, COULD NOT STOP IT. STARTED DSCNT TO 31,000'. WHEN CABIN WENT TO 10,000' IN DSCNT WE DECLARED AN EMER TO GET LOWER. IND WAS BELOW LNDG MIN. WE DIVERTED TO FWA. THE CABIN DID NOT GET HIGH ENOUGH TO DROP THE MASKS.
Data retrieved from NASA's ASRS site as of August 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.