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Flight crew of medium large transport descended prior to an ATC clearance due to an uncontrollable pressurization problem.
| Attributes | |
| ACN | 288755 |
| Time | |
| Date | 199411 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rbs |
| State Reference | IL |
| Altitude | msl bound lower : 17000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tracon : mco |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 16000 flight time type : 7000 |
| ASRS Report | 288755 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far 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 |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing through FL260 en route to FL280, the aircraft cabin altitude became uncontrollable. As cabin altitude passed 5500 ft on its way up, a rapid descent was initiated prior to ATC clearance. Aircraft descended to 17000 ft where pressurization control again regained. There was no traffic conflict and we were VFR. Clearance was obtained for operation at 17000 ft upon arrival at that altitude. An emergency was not declared because of inability to contact controller prior to descent. (Controller workload) (cockpit workload).
Original NASA ASRS Text
Title: FLC OF MLG DSNDED PRIOR TO AN ATC CLRNC DUE TO AN UNCTLABLE PRESSURIZATION PROB.
Narrative: CLBING THROUGH FL260 ENRTE TO FL280, THE ACFT CABIN ALT BECAME UNCTLABLE. AS CABIN ALT PASSED 5500 FT ON ITS WAY UP, A RAPID DSCNT WAS INITIATED PRIOR TO ATC CLRNC. ACFT DSNDED TO 17000 FT WHERE PRESSURIZATION CTL AGAIN REGAINED. THERE WAS NO TFC CONFLICT AND WE WERE VFR. CLRNC WAS OBTAINED FOR OP AT 17000 FT UPON ARR AT THAT ALT. AN EMER WAS NOT DECLARED BECAUSE OF INABILITY TO CONTACT CTLR PRIOR TO DSCNT. (CTLR WORKLOAD) (COCKPIT WORKLOAD).
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.