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Emergency descent caused be pressurization problem. Descended beyond their clearance limit before emergency was declared.
| Attributes | |
| ACN | 84984 |
| Time | |
| Date | 198803 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bhm |
| State Reference | AL |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tower : tyr |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7000 flight time type : 2300 |
| ASRS Report | 84984 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : insufficient time |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Pressure controller failure caused emergency descent situation. ATC issued FL240 trying to get lower with a 'standby.' possibility that we descended through FL240 prior to clearance. Emergency was declared, but exactly when and what altitude we were passing is in doubt in my mind.
Original NASA ASRS Text
Title: EMERGENCY DESCENT CAUSED BE PRESSURIZATION PROBLEM. DESCENDED BEYOND THEIR CLRNC LIMIT BEFORE EMERGENCY WAS DECLARED.
Narrative: PRESSURE CTLR FAILURE CAUSED EMER DSCNT SITUATION. ATC ISSUED FL240 TRYING TO GET LOWER WITH A 'STANDBY.' POSSIBILITY THAT WE DSNDED THROUGH FL240 PRIOR TO CLRNC. EMER WAS DECLARED, BUT EXACTLY WHEN AND WHAT ALT WE WERE PASSING IS IN DOUBT IN MY MIND.
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.