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A B737's pressurization control system failed. After declaring an emergency; the crew descended and diverted to an enroute airport.
| Attributes | |
| ACN | 811448 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 30000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 200 flight time total : 6000 flight time type : 2500 |
| ASRS Report | 811448 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 225 flight time total : 15000 flight time type : 1150 |
| ASRS Report | 811446 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude warning horn other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed in emergency condition flight crew : exited adverse environment flight crew : diverted to another airport flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Climbing through FL300; altitude warning horn sounds. Captain silences. Both pilots donned oxygen masks; told ATC needed lower altitude due to pressurization problem and first officer ran intermittent warning horn checklist. Captain flying and talking to ATC. First officer running checklists and monitoring pressurization. Around FL240; pressurization seemed to stabilize; so we tried to slow aircraft descent and level off. Cabin descent rate then dove to 4000+ FPM. We declared an emergency with ATC; asked for immediate descent to 10000 ft and requested landing in ZZZ. First officer ran emergency descent checklist and checklist while captain descended to 10000 ft. Passing through about 14000 ft; captain xferred control of plane and ATC to first officer. Captain then conferred with dispatch; flight attendants and passenger. When captain done; he assumed control of aircraft and landed in ZZZ.
Original NASA ASRS Text
Title: A B737'S PRESSURIZATION CONTROL SYSTEM FAILED. AFTER DECLARING AN EMERGENCY; THE CREW DESCENDED AND DIVERTED TO AN ENROUTE AIRPORT.
Narrative: CLBING THROUGH FL300; ALT WARNING HORN SOUNDS. CAPT SILENCES. BOTH PLTS DONNED OXYGEN MASKS; TOLD ATC NEEDED LOWER ALT DUE TO PRESSURIZATION PROB AND FO RAN INTERMITTENT WARNING HORN CHKLIST. CAPT FLYING AND TALKING TO ATC. FO RUNNING CHKLISTS AND MONITORING PRESSURIZATION. AROUND FL240; PRESSURIZATION SEEMED TO STABILIZE; SO WE TRIED TO SLOW ACFT DSCNT AND LEVEL OFF. CABIN DSCNT RATE THEN DOVE TO 4000+ FPM. WE DECLARED AN EMER WITH ATC; ASKED FOR IMMEDIATE DSCNT TO 10000 FT AND REQUESTED LNDG IN ZZZ. FO RAN EMER DSCNT CHKLIST AND CHKLIST WHILE CAPT DSNDED TO 10000 FT. PASSING THROUGH ABOUT 14000 FT; CAPT XFERRED CTL OF PLANE AND ATC TO FO. CAPT THEN CONFERRED WITH DISPATCH; FLT ATTENDANTS AND PAX. WHEN CAPT DONE; HE ASSUMED CTL OF ACFT AND LANDED IN ZZZ.
Data retrieved from NASA's ASRS site as of May 2009 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.