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B757 first officer reports pressurization controller failure at FL360. Control is regained at FL240 in manual. Flight crew elects to divert.
| Attributes | |
| ACN | 793839 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 36000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| 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 : 230 flight time total : 13000 flight time type : 8000 |
| ASRS Report | 793839 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : landed as precaution flight crew : diverted to another airport |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Approximately 1.5 hours into flight at FL360 we experienced a bump in the air conditioning. We immediately noticed that the cabin was climbing between 1000-1500 FPM. Captain and I both went on oxygen and established communications per the QRH. We then requested lower with ATC and started a descent to FL240. During the descent we switched to the second automatic pressurization controller with no change to the climbing cabin. We then selected manual pressurization control and were able to control the cabin once we got to FL240. The cabin climbed to 9000 ft from the time of onset to the point where we got the cabin under control. At that point we communicated with dispatch and a decision was made to divert to ZZZ with a non-eventful landing at maximum landing weight.
Original NASA ASRS Text
Title: B757 FO REPORTS PRESSURIZATION CONTROLLER FAILURE AT FL360. CONTROL IS REGAINED AT FL240 IN MANUAL. FLT CREW ELECTS TO DIVERT.
Narrative: APPROX 1.5 HRS INTO FLT AT FL360 WE EXPERIENCED A BUMP IN THE AIR CONDITIONING. WE IMMEDIATELY NOTICED THAT THE CABIN WAS CLBING BTWN 1000-1500 FPM. CAPT AND I BOTH WENT ON OXYGEN AND ESTABLISHED COMS PER THE QRH. WE THEN REQUESTED LOWER WITH ATC AND STARTED A DSCNT TO FL240. DURING THE DSCNT WE SWITCHED TO THE SECOND AUTO PRESSURIZATION CTLR WITH NO CHANGE TO THE CLBING CABIN. WE THEN SELECTED MANUAL PRESSURIZATION CTL AND WERE ABLE TO CTL THE CABIN ONCE WE GOT TO FL240. THE CABIN CLBED TO 9000 FT FROM THE TIME OF ONSET TO THE POINT WHERE WE GOT THE CABIN UNDER CTL. AT THAT POINT WE COMMUNICATED WITH DISPATCH AND A DECISION WAS MADE TO DIVERT TO ZZZ WITH A NON-EVENTFUL LNDG AT MAX LNDG WT.
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.