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CRJ900 flight crew receives a diff press master warning message climbing to FL340. A descent is initiated before a note in the QRH is red indicating that a climb rate greater than 1500 FPM above 30;000 feet may cause the maximum differential pressure to be exceeded. With the differential pressure back to normal the flight is continued to destination at FL310.
| Attributes | |
| ACN | 1235739 |
| Time | |
| Date | 201501 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZJX.ARTCC |
| State Reference | FL |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
The captain was the pilot flying and was climbing to FL340 when we received a diff press master warning message. I looked at the cabin pressure data and the delta P read 8.6; but the cabin alt and rate were all normal indications. As a precaution we donned our crew O2 masks and the captain transferred the controls and the radios to myself; and he proceeded to run the QRH. I initiated a descent to 10000 coordinated with ATC and did not exceed 400 FPM in the descent because the cabin pressure was all normal. The captain completed the QRH and the message went away within 1 minute of starting the descent. We stopped our descent at FL250 with the QRH complete and all indications normal. A note in the QRH advised that when climbing above 30;000 feet at a vs of greater than 1500 FPM a master caution diff press could occur. The company was advised and we continued to destination and climbed back to FL310.
Original NASA ASRS Text
Title: CRJ900 flight crew receives a DIFF PRESS master warning message climbing to FL340. A descent is initiated before a note in the QRH is red indicating that a climb rate greater than 1500 FPM above 30;000 feet may cause the maximum differential pressure to be exceeded. With the differential pressure back to normal the flight is continued to destination at FL310.
Narrative: The captain was the pilot flying and was climbing to FL340 when we received a DIFF PRESS master warning message. I looked at the cabin pressure data and the delta P read 8.6; but the cabin alt and rate were all normal indications. As a precaution we donned our crew O2 masks and the captain transferred the controls and the radios to myself; and he proceeded to run the QRH. I initiated a descent to 10000 coordinated with ATC and did not exceed 400 FPM in the descent because the cabin pressure was all normal. The captain completed the QRH and the message went away within 1 minute of starting the descent. We stopped our descent at FL250 with the QRH complete and all indications normal. A note in the QRH advised that when climbing above 30;000 feet at a VS of greater than 1500 FPM a master caution DIFF PRESS could occur. The company was advised and we continued to destination and climbed back to FL310.
Data retrieved from NASA's ASRS site 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.