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Emergency descent initiated after cabin altitude above 10,000' with altitude warning hor alerting crew.
| Attributes | |
| ACN | 110911 |
| Time | |
| Date | 198905 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : buf |
| State Reference | NY |
| Altitude | msl bound lower : 39000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob tower : hou |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 4000 flight time type : 240 |
| ASRS Report | 110911 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 1700 |
| ASRS Report | 110912 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
Narrative:
Heard cabin altitude horn. Saw cabin altitude passing through 10,000' and right pack trip light on. Performed immediate action to keep cabin altitude below 14,000'. Arrested cabin altitude at approximately 11,500'. Captain initiated emergency descent. Reset pack and returned cabin to normal. Did not drop passenger O2 masks since cabin stabilized and returned to normal very expeditiously. Pack functioned normally for rest of flight.
Original NASA ASRS Text
Title: EMERGENCY DESCENT INITIATED AFTER CABIN ALT ABOVE 10,000' WITH ALT WARNING HOR ALERTING CREW.
Narrative: HEARD CABIN ALT HORN. SAW CABIN ALT PASSING THROUGH 10,000' AND RIGHT PACK TRIP LIGHT ON. PERFORMED IMMEDIATE ACTION TO KEEP CABIN ALT BELOW 14,000'. ARRESTED CABIN ALT AT APPROX 11,500'. CAPT INITIATED EMER DSCNT. RESET PACK AND RETURNED CABIN TO NORMAL. DID NOT DROP PAX O2 MASKS SINCE CABIN STABILIZED AND RETURNED TO NORMAL VERY EXPEDITIOUSLY. PACK FUNCTIONED NORMALLY FOR REST OF FLT.
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.