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A B727-200 in cruise at FL330 made an emergency descent due to loss of cabin pressure caused by a failed open ground air conditioning flapper valve.
| Attributes | |
| ACN | 474693 |
| Time | |
| Date | 200006 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : gso.airport |
| State Reference | NC |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j208.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 600 flight time total : 4600 flight time type : 1600 |
| ASRS Report | 474693 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : cfi pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 40 flight time total : 5000 flight time type : 300 |
| ASRS Report | 474695 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
On jun/fri/00, during the conduct of flight abc from ZZZ to XXX, the flight engineer indicated that he was unable to maintain cabin pressure. We initiated an expedited descent from FL330 to 10000 ft MSL (with ATC clearance), while running the loss of cabin pressure checklist. Pressurization was not restored. We proceeded at 10000 ft MSL to destination with the concurrence of air carrier, operation and maintenance. The remainder of the flight was uneventful.
Original NASA ASRS Text
Title: A B727-200 IN CRUISE AT FL330 MADE AN EMER DSCNT DUE TO LOSS OF CABIN PRESSURE CAUSED BY A FAILED OPEN GND AIR CONDITIONING FLAPPER VALVE.
Narrative: ON JUN/FRI/00, DURING THE CONDUCT OF FLT ABC FROM ZZZ TO XXX, THE FE INDICATED THAT HE WAS UNABLE TO MAINTAIN CABIN PRESSURE. WE INITIATED AN EXPEDITED DSCNT FROM FL330 TO 10000 FT MSL (WITH ATC CLRNC), WHILE RUNNING THE LOSS OF CABIN PRESSURE CHKLIST. PRESSURIZATION WAS NOT RESTORED. WE PROCEEDED AT 10000 FT MSL TO DEST WITH THE CONCURRENCE OF ACR, OP AND MAINT. THE REMAINDER OF THE FLT WAS UNEVENTFUL.
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.