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A B737-300's cabin altitude warning horn sounded at FL340. The crew dscnded to FL240 and gained pressurization ctrl.
| Attributes | |
| ACN | 809605 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| 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 |
| Experience | flight time last 90 days : 234 |
| ASRS Report | 809605 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin alt warning horn other flight crewa |
| Resolutory Action | flight crew : took precautionary avoidance action flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Cruising FL340; the cabin altitude warning horn activated. We complied with the boxed memory items on the cabin altitude warning checklist; and then accomplished the cabin altitude warning QRH. Prior to the cabin altitude warning horn; we had been discussing a descent to a lower flight level due to strong headwinds. After the cabin altitude horn QRH checklist was completed; we had descended to FL240. Landed at ZZZ1 and aircraft was met by maintenance.
Original NASA ASRS Text
Title: A B737-300'S CABIN ALT WARNING HORN SOUNDED AT FL340. THE CREW DSCNDED TO FL240 AND GAINED PRESSURIZATION CTRL.
Narrative: CRUISING FL340; THE CABIN ALT WARNING HORN ACTIVATED. WE COMPLIED WITH THE BOXED MEMORY ITEMS ON THE CABIN ALT WARNING CHKLIST; AND THEN ACCOMPLISHED THE CABIN ALT WARNING QRH. PRIOR TO THE CABIN ALT WARNING HORN; WE HAD BEEN DISCUSSING A DSCNT TO A LOWER FLT LEVEL DUE TO STRONG HEADWINDS. AFTER THE CABIN ALT HORN QRH CHKLIST WAS COMPLETED; WE HAD DSNDED TO FL240. LANDED AT ZZZ1 AND ACFT WAS MET BY MAINT.
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.