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B737-300 lost cabin pressure during leveloff. Pressurization could not be controlled; so the flight crew initiated an emergency descent.
| Attributes | |
| ACN | 785643 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 36000 |
| 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 | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 224 |
| ASRS Report | 785643 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin alt worning horn other flight crewa |
| Resolutory Action | flight crew : landed as precaution flight crew : diverted to another airport flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Leveling off at FL360; the cabin altitude warning horn came one. The first officer and I both checked the cabin altitude climbing past 10000 ft and cabin rate of change climbing at 1000 FPM. We immediately put on our oxygen masks and established crew communication. We referred to the QRH; cabin altitude warning horn/abnormal pressurization checklist and tried to control the system by going to alternate. No lights were on until changing to alternate. When the alternate lights came on; there was still no control. We switched to manual; but that was not helping. I then informed ATC of our problem and declared an emergency. ATC cleared us to descend to ZZZ. We accomplished the emergency descent checklist from memory and started down; making a left turn back to ZZZ. On descent; the passenger masks dropped. A PA was made to the cabin informing them of our problem and intentions. We accomplished normal checks and contacted dispatch via ACARS. ZZZ operations were also contacted via company radio.
Original NASA ASRS Text
Title: B737-300 LOST CABIN PRESSURE DURING LEVELOFF. PRESSURIZATION COULD NOT BE CONTROLLED; SO THE FLT CREW INITIATED AN EMER DESCENT.
Narrative: LEVELING OFF AT FL360; THE CABIN ALT WARNING HORN CAME ONE. THE FO AND I BOTH CHKED THE CABIN ALT CLBING PAST 10000 FT AND CABIN RATE OF CHANGE CLBING AT 1000 FPM. WE IMMEDIATELY PUT ON OUR OXYGEN MASKS AND ESTABLISHED CREW COM. WE REFERRED TO THE QRH; CABIN ALT WARNING HORN/ABNORMAL PRESSURIZATION CHKLIST AND TRIED TO CTL THE SYS BY GOING TO ALTERNATE. NO LIGHTS WERE ON UNTIL CHANGING TO ALTERNATE. WHEN THE ALTERNATE LIGHTS CAME ON; THERE WAS STILL NO CTL. WE SWITCHED TO MANUAL; BUT THAT WAS NOT HELPING. I THEN INFORMED ATC OF OUR PROB AND DECLARED AN EMER. ATC CLRED US TO DSND TO ZZZ. WE ACCOMPLISHED THE EMER DSCNT CHKLIST FROM MEMORY AND STARTED DOWN; MAKING A L TURN BACK TO ZZZ. ON DSCNT; THE PAX MASKS DROPPED. A PA WAS MADE TO THE CABIN INFORMING THEM OF OUR PROB AND INTENTIONS. WE ACCOMPLISHED NORMAL CHKS AND CONTACTED DISPATCH VIA ACARS. ZZZ OPS WERE ALSO CONTACTED VIA COMPANY RADIO.
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.