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An MD80 crew comments that the cabin climbed to 9500 ft but was controlled. After landing maintenance reset both controller circuit breakers and returned the aircraft to service.
| Attributes | |
| ACN | 789652 |
| Time | |
| Date | 200806 |
| 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 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| 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 |
| ASRS Report | 789652 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 789650 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : exited adverse environment flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
We were level at FL340 when the cabin alert went off. We noticed the cabin was at 9500 ft and climbing rapidly. We immediately accomplished the red box and closed the outflow valve. The cabin responded by descending. We did not declare an emergency; but requested a lower altitude due to a pressurization problem. ATC cleared us to descend to 10000 ft. The cabin was clearly under control so I elected to level off at 16000 ft due to fuel considerations. We were approximately 350 mi from ZZZ. We continued to ZZZ without further incidence. Maintenance checked and reset both controllers and circuit breakers and returned the aircraft to service. We then flew to ZZZ1 without any further problems.
Original NASA ASRS Text
Title: AN MD80 CREW COMMENTS THAT THE CABIN CLBED TO 9500 FT BUT WAS CONTROLLED. AFTER LNDG MAINT RESET BOTH CONTROLLER CIRCUIT BREAKERS AND RETURNED THE ACFT TO SERVICE.
Narrative: WE WERE LEVEL AT FL340 WHEN THE CABIN ALERT WENT OFF. WE NOTICED THE CABIN WAS AT 9500 FT AND CLBING RAPIDLY. WE IMMEDIATELY ACCOMPLISHED THE RED BOX AND CLOSED THE OUTFLOW VALVE. THE CABIN RESPONDED BY DSNDING. WE DID NOT DECLARE AN EMER; BUT REQUESTED A LOWER ALT DUE TO A PRESSURIZATION PROB. ATC CLRED US TO DSND TO 10000 FT. THE CABIN WAS CLEARLY UNDER CTL SO I ELECTED TO LEVEL OFF AT 16000 FT DUE TO FUEL CONSIDERATIONS. WE WERE APPROX 350 MI FROM ZZZ. WE CONTINUED TO ZZZ WITHOUT FURTHER INCIDENCE. MAINT CHKED AND RESET BOTH CONTROLLERS AND CIRCUIT BREAKERS AND RETURNED THE ACFT TO SVC. WE THEN FLEW TO ZZZ1 WITHOUT ANY FURTHER PROBS.
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.