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B737-800 flight crew reported a partial loss of pressurization during cruise. A descent was initiated and after the cabin pressure stabilized; a successful diversion was accomplished.
| Attributes | |
| ACN | 1509528 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
While climbing to our cruising altitude; bleed trip off illuminated. We followed the QRH procedures for bleed trip off to completion. Approximately 20 minutes later at a cruise altitude of FL340 we had a cabin altitude indication. We donned our oxygen masks and performed the cabin altitude warning procedures per the QRH. The cabin altitude gauge indication was 10;000 ft. All other pressurization gauge indications were normal. We elected to descend. The captain [advised] ATC. ATC cleared us to FL240 initially and then to 10;000 ft. The captain was flying and advising the flight attendants; I followed the rapid descent checklist. The cabin altitude never exceeded 10;000 ft. At 10;000 ft we coordinated with dispatch and at their request diverted to alternate airport.
Original NASA ASRS Text
Title: B737-800 flight crew reported a partial loss of pressurization during cruise. A descent was initiated and after the cabin pressure stabilized; a successful diversion was accomplished.
Narrative: While climbing to our cruising altitude; BLEED TRIP OFF illuminated. We followed the QRH procedures for BLEED TRIP OFF to completion. Approximately 20 minutes later at a cruise altitude of FL340 we had a CABIN ALTITUDE indication. We donned our oxygen masks and performed the CABIN ALTITUDE WARNING procedures per the QRH. The cabin altitude gauge indication was 10;000 ft. All other pressurization gauge indications were normal. We elected to descend. The Captain [advised] ATC. ATC cleared us to FL240 initially and then to 10;000 ft. The Captain was flying and advising the flight attendants; I followed the RAPID DESCENT checklist. The cabin altitude never exceeded 10;000 ft. At 10;000 ft we coordinated with dispatch and at their request diverted to alternate airport.
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.