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A B727-200 climbing through FL330 declared an emergency and diverted due to unable to pressurize the cabin. Caused by 35 degree valve failure.
| Attributes | |
| ACN | 543961 |
| Time | |
| Date | 200204 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 130 flight time total : 9000 flight time type : 4000 |
| ASRS Report | 543961 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indicator other flight crewa other flight crewb other other : 3 |
| Resolutory Action | flight crew : declared emergency flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During climb, passing through FL330, we lost cabin pressure. Performed the emergency checklist but could not control the cabin. We declared an emergency with ATC, descended to 10000 ft and returned to ZZZ. We received no reports of any passenger injuries. Callback conversation with reporter revealed the following information: the reporter stated the cause of the pressurization failure was the water separators were iced up due to the 35 degree valves not modulating to open. The reporter said both valves had failed closed.
Original NASA ASRS Text
Title: A B727-200 CLBING THROUGH FL330 DECLARED AN EMER AND DIVERTED DUE TO UNABLE TO PRESSURIZE THE CABIN. CAUSED BY 35 DEG VALVE FAILURE.
Narrative: DURING CLB, PASSING THROUGH FL330, WE LOST CABIN PRESSURE. PERFORMED THE EMER CHKLIST BUT COULD NOT CTL THE CABIN. WE DECLARED AN EMER WITH ATC, DSNDED TO 10000 FT AND RETURNED TO ZZZ. WE RECEIVED NO RPTS OF ANY PAX INJURIES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE PRESSURIZATION FAILURE WAS THE WATER SEPARATORS WERE ICED UP DUE TO THE 35 DEG VALVES NOT MODULATING TO OPEN. THE RPTR SAID BOTH VALVES HAD FAILED CLOSED.
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.