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Unable to maintain cabin pressure PIC elects to declare an emergency as he descends through the previously cleared altitude of 24000'.
| Attributes | |
| ACN | 169759 |
| Time | |
| Date | 199102 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : grb |
| State Reference | WI |
| Altitude | msl bound lower : 10000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other 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 : 150 flight time total : 10000 flight time type : 1000 |
| ASRS Report | 169759 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 1000 |
| ASRS Report | 169749 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Loss of cabin pressure forced a rapid descent. Aircraft was cleared to 24000'. I chose to declare an emergency and continue past 24000' down to 10000' to stabilize cabin altitude. ATC had little time to reclr us just 24000' before we went through that altitude. Flight was en route from dtw-msp and continued on to msp. No further problems. Supplemental information from acn 169749: we notified ATC that we needed a descent. We were cleared to FL240. Nearing FL240 we requested lower.
Original NASA ASRS Text
Title: UNABLE TO MAINTAIN CABIN PRESSURE PIC ELECTS TO DECLARE AN EMERGENCY AS HE DESCENDS THROUGH THE PREVIOUSLY CLEARED ALT OF 24000'.
Narrative: LOSS OF CABIN PRESSURE FORCED A RAPID DSNT. ACFT WAS CLRED TO 24000'. I CHOSE TO DECLARE AN EMER AND CONTINUE PAST 24000' DOWN TO 10000' TO STABILIZE CABIN ALT. ATC HAD LITTLE TIME TO RECLR US JUST 24000' BEFORE WE WENT THROUGH THAT ALT. FLT WAS ENRTE FROM DTW-MSP AND CONTINUED ON TO MSP. NO FURTHER PROBS. SUPPLEMENTAL INFO FROM ACN 169749: WE NOTIFIED ATC THAT WE NEEDED A DSNT. WE WERE CLRED TO FL240. NEARING FL240 WE REQUESTED LOWER.
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.