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Air carrier medium large transport had pressurization problems at FL310, declared an emergency and started a descent to 10000'.
| Attributes | |
| ACN | 171056 |
| Time | |
| Date | 199102 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 20000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other other |
| Route In Use | enroute airway : zfw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 4000 flight time type : 1000 |
| ASRS Report | 171056 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 145 flight time total : 17323 |
| ASRS Report | 171054 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
At 31000' in crz flow light came on followed by cabin climbing. Began descent and declared emergency. Ran emergency descent checklist. Descended towards 10000'. Manually deployed oxy mask (passenger) right pack indicated no pressure, and ran loss of pack checklist. At 20000' pack came back on, pressurization was restored and we continued descent. Normal approach and landing.
Original NASA ASRS Text
Title: ACR MLG HAD PRESSURIZATION PROBLEMS AT FL310, DECLARED AN EMERGENCY AND STARTED A DESCENT TO 10000'.
Narrative: AT 31000' IN CRZ FLOW LIGHT CAME ON FOLLOWED BY CABIN CLBING. BEGAN DSNT AND DECLARED EMER. RAN EMER DSNT CHKLIST. DSNDED TOWARDS 10000'. MANUALLY DEPLOYED OXY MASK (PAX) R PACK INDICATED NO PRESSURE, AND RAN LOSS OF PACK CHKLIST. AT 20000' PACK CAME BACK ON, PRESSURIZATION WAS RESTORED AND WE CONTINUED DSNT. NORMAL APCH AND LNDG.
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.