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An medium large transport air carrier crew had a partial loss of pressurization while at FL370. They made an emergency descent with some communications and equipment difficulty.
| Attributes | |
| ACN | 210619 |
| Time | |
| Date | 199205 |
| Day | Sun |
| Place | |
| Locale Reference | atc facility : slt |
| State Reference | PA |
| Altitude | msl bound lower : 18000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent 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 : 210 flight time total : 9000 flight time type : 1600 |
| ASRS Report | 210619 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10500 flight time type : 3500 |
| ASRS Report | 210948 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
We had just started a descent from FL370. At that time aircraft CAWS warning indicated a climb altitude problem. Cabin altitude was noted climbing through 9500 ft. Decompression memory items were accomplished, ATC was notified of a cabin altitude problem and a lower altitude was requested. During checklist, passenger oxygen masks were deployed. Control of cabin altitude was regained and a descent and landing were accomplished using manual cabin pressure control. No deviations from ATC clearance were necessary. This all began near slt. The oxygen masks were difficult/impossible to get on over glasses/sunglasses. Cockpit communication was more difficult due to ATC chatter with other aircraft. Checklist items, to be read and accomplished, were delayed because first officer could not find procedure on checklist. Manual cabin pressure control is difficult and takes full attention of PNF.
Original NASA ASRS Text
Title: AN MLG ACR CREW HAD A PARTIAL LOSS OF PRESSURIZATION WHILE AT FL370. THEY MADE AN EMER DSCNT WITH SOME COMS AND EQUIP DIFFICULTY.
Narrative: WE HAD JUST STARTED A DSCNT FROM FL370. AT THAT TIME ACFT CAWS WARNING INDICATED A CLB ALT PROBLEM. CABIN ALT WAS NOTED CLBING THROUGH 9500 FT. DECOMPRESSION MEMORY ITEMS WERE ACCOMPLISHED, ATC WAS NOTIFIED OF A CABIN ALT PROBLEM AND A LOWER ALT WAS REQUESTED. DURING CHKLIST, PAX OXYGEN MASKS WERE DEPLOYED. CTL OF CABIN ALT WAS REGAINED AND A DSCNT AND LNDG WERE ACCOMPLISHED USING MANUAL CABIN PRESSURE CTL. NO DEVS FROM ATC CLRNC WERE NECESSARY. THIS ALL BEGAN NEAR SLT. THE OXYGEN MASKS WERE DIFFICULT/IMPOSSIBLE TO GET ON OVER GLASSES/SUNGLASSES. COCKPIT COM WAS MORE DIFFICULT DUE TO ATC CHATTER WITH OTHER ACFT. CHKLIST ITEMS, TO BE READ AND ACCOMPLISHED, WERE DELAYED BECAUSE FO COULD NOT FIND PROC ON CHKLIST. MANUAL CABIN PRESSURE CTL IS DIFFICULT AND TAKES FULL ATTN OF PNF.
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.