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A B737-500 in cruise at FL280 declared an emergency and descended due to loss of cabin pressure caused by malfunctioning pressure controller and forward outflow valve.
| Attributes | |
| ACN | 521721 |
| Time | |
| Date | 200108 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 28000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 7000 |
| ASRS Report | 521721 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indication other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Lost control of cabin pressure. While level at FL280, declared emergency and began descent, ran QRH, regained control of pressure and leveled at 10000 ft. Cabin altitude exceeded 10000 ft but remained below altitude that triggers mask deployment. Once level at 10000 ft cabin altitude returned to normal. Proceeded to and landed at iah. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B737-500. The reporter said the loss of cabin pressure was a malfunctioning pressure controller. The reporter stated maintenance advised the crew it failed to self-test and the forward outflow valve was replaced precautionary.
Original NASA ASRS Text
Title: A B737-500 IN CRUISE AT FL280 DECLARED AN EMER AND DSNDED DUE TO LOSS OF CABIN PRESSURE CAUSED BY MALFUNCTIONING PRESSURE CTLR AND FORWARD OUTFLOW VALVE.
Narrative: LOST CTL OF CABIN PRESSURE. WHILE LEVEL AT FL280, DECLARED EMER AND BEGAN DSCNT, RAN QRH, REGAINED CTL OF PRESSURE AND LEVELED AT 10000 FT. CABIN ALT EXCEEDED 10000 FT BUT REMAINED BELOW ALT THAT TRIGGERS MASK DEPLOYMENT. ONCE LEVEL AT 10000 FT CABIN ALT RETURNED TO NORMAL. PROCEEDED TO AND LANDED AT IAH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B737-500. THE RPTR SAID THE LOSS OF CABIN PRESSURE WAS A MALFUNCTIONING PRESSURE CTLR. THE RPTR STATED MAINT ADVISED THE CREW IT FAILED TO SELF-TEST AND THE FORWARD OUTFLOW VALVE WAS REPLACED PRECAUTIONARY.
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.