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Air carrier large transport aircraft lost pressurization at high altitude and descended until the problem could be resolved.
| Attributes | |
| ACN | 214909 |
| Time | |
| Date | 199207 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mgw |
| State Reference | WV |
| Altitude | msl bound lower : 9000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| 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 : instrument pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 8900 flight time type : 675 |
| ASRS Report | 214909 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 97 flight time total : 9250 |
| ASRS Report | 214490 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Aircraft was dispatched with one air conditioning pack inoperative. In cruise at FL250 a bleed trip occurred causing the remaining pack to become ineffective due to lack of air flow. Aircraft began to depressurize, captain asked for and received clearance to lower altitudes. Eventually leveled at 9000 ft. Passenger oxygen did not activate, cabin altitude did not exceed 10000 ft, no injuries. Pack was reinstated after bleed trip was reset. Climbed back to FL190 to complete trip. ATC was very helpful in providing immediate altitude clrncs.
Original NASA ASRS Text
Title: ACR LGT ACFT LOST PRESSURIZATION AT HIGH ALT AND DSNDED UNTIL THE PROBLEM COULD BE RESOLVED.
Narrative: ACFT WAS DISPATCHED WITH ONE AIR CONDITIONING PACK INOP. IN CRUISE AT FL250 A BLEED TRIP OCCURRED CAUSING THE REMAINING PACK TO BECOME INEFFECTIVE DUE TO LACK OF AIR FLOW. ACFT BEGAN TO DEPRESSURIZE, CAPT ASKED FOR AND RECEIVED CLRNC TO LOWER ALTS. EVENTUALLY LEVELED AT 9000 FT. PAX OXYGEN DID NOT ACTIVATE, CABIN ALT DID NOT EXCEED 10000 FT, NO INJURIES. PACK WAS REINSTATED AFTER BLEED TRIP WAS RESET. CLBED BACK TO FL190 TO COMPLETE TRIP. ATC WAS VERY HELPFUL IN PROVIDING IMMEDIATE ALT CLRNCS.
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.