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CRJ900 captain experiences a cabin differential pressure warning at FL380. The crew dons oxygen masks; an emergency is declared; and descent initiated. During the descent the system is switched automatically to cpam 2 and the differential pressure warning is extinguished. Flight continues to destination at FL240.
| Attributes | |
| ACN | 947741 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 12 Flight Crew Total 6000 Flight Crew Type 600 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
At FL380 we got a master warning with triple chime with diff press annunciated. The first officer and I both noticed the differential pressure was 8.9 and flashing red. Both oxygen masks were put on and a descent was initiated with a emergency declared to ATC. During the descent the pressure controller was changed to the cpam 2 by the auto function and the message cleared. By the time I opened my manual the message was cleared and no more abnormalities present. We called the dispatcher and advised him of the situation and elected to stay at 24;000 ft because we were no longer in an emergency state. I called center and canceled the emergency and continued to destination without any further problems. The cpam 1 failed to correct for the proper pressure of the aircraft; exceeding the normal value.
Original NASA ASRS Text
Title: CRJ900 Captain experiences a cabin differential pressure warning at FL380. The crew dons oxygen masks; an emergency is declared; and descent initiated. During the descent the system is switched automatically to CPAM 2 and the differential pressure warning is extinguished. Flight continues to destination at FL240.
Narrative: At FL380 we got a master warning with triple chime with DIFF PRESS annunciated. The First Officer and I both noticed the differential pressure was 8.9 and flashing red. Both oxygen masks were put on and a descent was initiated with a emergency declared to ATC. During the descent the pressure controller was changed to the CPAM 2 by the auto function and the message cleared. By the time I opened my manual the message was cleared and no more abnormalities present. We called the Dispatcher and advised him of the situation and elected to stay at 24;000 FT because we were no longer in an emergency state. I called Center and canceled the emergency and continued to destination without any further problems. The CPAM 1 failed to correct for the proper pressure of the aircraft; exceeding the normal value.
Data retrieved from NASA's ASRS site as of April 2012 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.