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B737-700 flight crew experiences a bleed trip at FL410 that cannot be reset. Ten minutes later the second bleed trips and the cabin altitude warning sounds. An emergency is declared and descent initiated; with a successful reset during the descent allowing the flight to continue to destination.
| Attributes | |
| ACN | 1151312 |
| Time | |
| Date | 201402 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Experience | Flight Crew Last 90 Days 228 Flight Crew Type 6200 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Experience | Flight Crew Last 90 Days 218 Flight Crew Type 8400 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While flying at FL410; we got a left bleed trip indication. Not long after; the altitude warning horn sounded due to a loss of pressurization from a right bleed trip. I was the pilot flying. We completed the necessary checklists and regained pressurization during the descent. After coordinating with dispatch; we continued to destination and turned the aircraft over to maintenance. As known from previous events I have read about; communication was a challenge at first due to wearing masks. The flight attendants were curious at first since we were descending steeper and unexpectedly; but we quickly explained to them about our situation. This report is written to present an abnormal situation we have seen more of lately that presents challenges in communication between pilots. The crew worked well together and the passengers were kept informed. I believe this scenario has been run in training and should be continued since it is odd to communicate with the masks on. 'Chair flying' the steps help to make it more familiar in the event of a loss of pressurization and use of masks.
Original NASA ASRS Text
Title: B737-700 flight crew experiences a bleed trip at FL410 that cannot be reset. Ten minutes later the second bleed trips and the cabin altitude warning sounds. An emergency is declared and descent initiated; with a successful reset during the descent allowing the flight to continue to destination.
Narrative: While flying at FL410; we got a left Bleed Trip indication. Not long after; the Altitude Warning horn sounded due to a loss of pressurization from a right Bleed Trip. I was the Pilot Flying. We completed the necessary checklists and regained pressurization during the descent. After coordinating with Dispatch; we continued to destination and turned the aircraft over to Maintenance. As known from previous events I have read about; communication was a challenge at first due to wearing masks. The Flight Attendants were curious at first since we were descending steeper and unexpectedly; but we quickly explained to them about our situation. This report is written to present an abnormal situation we have seen more of lately that presents challenges in communication between pilots. The crew worked well together and the passengers were kept informed. I believe this scenario has been run in training and should be continued since it is odd to communicate with the masks on. 'Chair flying' the steps help to make it more familiar in the event of a loss of pressurization and use of masks.
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.