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Descent from cruise altitude because of insufficient cabin pressurization resulting in excessive cabin altitude. System reset.
| Attributes | |
| ACN | 113917 |
| Time | |
| Date | 198906 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : spa |
| State Reference | SC |
| Altitude | msl bound lower : 18400 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 185 flight time total : 7200 flight time type : 1300 |
| ASRS Report | 113917 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Due to maximum gross weight takeoff had to EST a 'no bleeds condition' for act performance. While taxiing we had a 10-15 min delay due to animal blocking our route to the runway. After takeoff, we overlooked reestablishing our pressurization system for a 'no bleeds condition'. After reaching cruise altitude FL310, we received 'cabin altitude warning horning' (cabin 10000). After a minute or so we confirmed both the cabin altitude at 10000 ft and that pressurization panel had not been reconfigured. We immediately asked for a lower altitude, reconfigured the pressurization panel. We were cleared to FL240, FL190 and asked if we needed lower (FL110 was given). At FL190 the cabin had reestablished itself, as we passed thru FL190, the controller asked if we were given lower and if we still needed FL110. We believed to be cleared to FL110, but after restoring the pressurization we not longer needed FL110. At FL184 we stopped the descent and ascended back to FL190 and continued flight to destination.
Original NASA ASRS Text
Title: DESCENT FROM CRUISE ALT BECAUSE OF INSUFFICIENT CABIN PRESSURIZATION RESULTING IN EXCESSIVE CABIN ALT. SYSTEM RESET.
Narrative: DUE TO MAX GROSS WT TKOF HAD TO EST A 'NO BLEEDS CONDITION' FOR ACT PERFORMANCE. WHILE TAXIING WE HAD A 10-15 MIN DELAY DUE TO ANIMAL BLOCKING OUR RTE TO THE RWY. AFTER TKOF, WE OVERLOOKED REESTABLISHING OUR PRESSURIZATION SYS FOR A 'NO BLEEDS CONDITION'. AFTER REACHING CRUISE ALT FL310, WE RECEIVED 'CABIN ALT WARNING HORNING' (CABIN 10000). AFTER A MINUTE OR SO WE CONFIRMED BOTH THE CABIN ALT AT 10000 FT AND THAT PRESSURIZATION PANEL HAD NOT BEEN RECONFIGURED. WE IMMEDIATELY ASKED FOR A LOWER ALT, RECONFIGURED THE PRESSURIZATION PANEL. WE WERE CLRED TO FL240, FL190 AND ASKED IF WE NEEDED LOWER (FL110 WAS GIVEN). AT FL190 THE CABIN HAD REESTABLISHED ITSELF, AS WE PASSED THRU FL190, THE CTLR ASKED IF WE WERE GIVEN LOWER AND IF WE STILL NEEDED FL110. WE BELIEVED TO BE CLRED TO FL110, BUT AFTER RESTORING THE PRESSURIZATION WE NOT LONGER NEEDED FL110. AT FL184 WE STOPPED THE DSCNT AND ASCENDED BACK TO FL190 AND CONTINUED FLT TO DEST.
Data retrieved from NASA's ASRS site as of August 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.