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B737-800 flight crew reports cabin altitude warning at FL330 near normal descent point. Manual control of the cabin is regained and a normal landing at destination ensues.
| Attributes | |
| ACN | 749801 |
| Time | |
| Date | 200708 |
| Local Time Of Day | 0601 To 1200 |
| 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 | B737-400 |
| 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 : 240 flight time type : 5000 |
| ASRS Report | 749801 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 749800 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude warning horn other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At cruise (FL330) prior to descent and after being cleared to 15000 ft; the altitude horn came on and the cabin was climbing (approximately 1500-1800 FPM). First officer was flying and I ran the qrc (QRH). Cabin got to 11500 ft before it leveled out and started to descend. Cabin altitude warning horn/rapid 'D' checklist was completed. Emergency descent checklist was started but the cabin was under control and the first officer had the aircraft in a rapid descent and was on a normal profile; so I turned my attention to the passenger and gave a PA and talked to the flight attendants. An emergency was not declared and a normal landing was made. Cabin pressure lost; crew worked well together. Though on a normal descent profile; should have worked more closely with center; in case things went bad. Cabin pressure lost.
Original NASA ASRS Text
Title: B737-800 FLT CREW REPORTS CABIN ALTITUDE WARNING AT FL330 NEAR NORMAL DESCENT POINT. MANUAL CONTROL OF THE CABIN IS REGAINED AND A NORMAL LANDING AT DESTINATION ENSUES.
Narrative: AT CRUISE (FL330) PRIOR TO DSCNT AND AFTER BEING CLRED TO 15000 FT; THE ALT HORN CAME ON AND THE CABIN WAS CLBING (APPROX 1500-1800 FPM). FO WAS FLYING AND I RAN THE QRC (QRH). CABIN GOT TO 11500 FT BEFORE IT LEVELED OUT AND STARTED TO DSND. CABIN ALT WARNING HORN/RAPID 'D' CHKLIST WAS COMPLETED. EMER DSCNT CHKLIST WAS STARTED BUT THE CABIN WAS UNDER CTL AND THE FO HAD THE ACFT IN A RAPID DSCNT AND WAS ON A NORMAL PROFILE; SO I TURNED MY ATTN TO THE PAX AND GAVE A PA AND TALKED TO THE FLT ATTENDANTS. AN EMER WAS NOT DECLARED AND A NORMAL LNDG WAS MADE. CABIN PRESSURE LOST; CREW WORKED WELL TOGETHER. THOUGH ON A NORMAL DSCNT PROFILE; SHOULD HAVE WORKED MORE CLOSELY WITH CTR; IN CASE THINGS WENT BAD. CABIN PRESSURE LOST.
Data retrieved from NASA's ASRS site as of January 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.