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Large transport has pressurization problem causing the flight crew to make an emergency descent a few thousand ft.
| Attributes | |
| ACN | 294184 |
| Time | |
| Date | 199501 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : vhp |
| State Reference | IN |
| Altitude | msl bound lower : 29000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : ict |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise 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 : 210 flight time total : 15000 |
| ASRS Report | 294184 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
I initiated a descent from FL330 after the aircraft cabin exceeded 1000 ft. I leveled off at FL290 once the flight engineer had regained control of the pressurization. The maximum altitude the cabin reached was less than 11000 ft. I had some trouble communicating with ATC. So I squawked 7700 on the transponder. To point out to them that we were descending.
Original NASA ASRS Text
Title: LGT HAS PRESSURIZATION PROB CAUSING THE FLC TO MAKE AN EMER DSCNT A FEW THOUSAND FT.
Narrative: I INITIATED A DSCNT FROM FL330 AFTER THE ACFT CABIN EXCEEDED 1000 FT. I LEVELED OFF AT FL290 ONCE THE FE HAD REGAINED CTL OF THE PRESSURIZATION. THE MAX ALT THE CABIN REACHED WAS LESS THAN 11000 FT. I HAD SOME TROUBLE COMMUNICATING WITH ATC. SO I SQUAWKED 7700 ON THE XPONDER. TO POINT OUT TO THEM THAT WE WERE DSNDING.
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.