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Flight crew of air carrier medium large transport aircraft declared an emergency descent due to loss of cabin pressurization at high cruise altitude.
| Attributes | |
| ACN | 235870 |
| Time | |
| Date | 199303 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : alo |
| State Reference | IA |
| Altitude | msl bound lower : 10000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : pfn |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 13500 flight time type : 9500 |
| ASRS Report | 235870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9300 flight time type : 500 |
| ASRS Report | 235882 |
| 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 other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
During cruise 'cabin pressure' and master warning light illuminated. A check of the cabin altimeter showed 10500 ft and climbing approximately 300 FPM. The 'loss of cabin pressure' emergency checklist was accomplished to no avail. A lower altitude was requested and received from center. The 'rapid descent' checklist was initiated and a rapid descent begun to 10000 ft MSL. As per procedure, ATC was notified and transponder was set to code 7700. When pressure was decreasing, the passenger oxygen masks deployed and flight attendant instructed passenger to use them. An uneventful landing was made at msp. A check by the flight attendants found all passenger to be feeling fine.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT DECLARED AN EMER DSCNT DUE TO LOSS OF CABIN PRESSURIZATION AT HIGH CRUISE ALT.
Narrative: DURING CRUISE 'CABIN PRESSURE' AND MASTER WARNING LIGHT ILLUMINATED. A CHK OF THE CABIN ALTIMETER SHOWED 10500 FT AND CLBING APPROX 300 FPM. THE 'LOSS OF CABIN PRESSURE' EMER CHKLIST WAS ACCOMPLISHED TO NO AVAIL. A LOWER ALT WAS REQUESTED AND RECEIVED FROM CTR. THE 'RAPID DSCNT' CHKLIST WAS INITIATED AND A RAPID DSCNT BEGUN TO 10000 FT MSL. AS PER PROC, ATC WAS NOTIFIED AND XPONDER WAS SET TO CODE 7700. WHEN PRESSURE WAS DECREASING, THE PAX OXYGEN MASKS DEPLOYED AND FLT ATTENDANT INSTRUCTED PAX TO USE THEM. AN UNEVENTFUL LNDG WAS MADE AT MSP. A CHK BY THE FLT ATTENDANTS FOUND ALL PAX TO BE FEELING FINE.
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.