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B737-800 flight crew reported they were dispatched with one pack inoperative; and they elected to return to departure airport after the remaining pack failed because of a bleed trip.
| Attributes | |
| ACN | 1664955 |
| Time | |
| Date | 201907 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pneumatic Control Valves |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Aircraft had left pack deferred and off. Right pack seemed to be functioning normally. Normal climb out [from the high elevation airport] via radar vectors. Passing approximately 13;000 feet; bleed trip off light illuminated; cabin pressure was lost; and cabin altitude horn sounded and light illuminated. I immediately began a descent to 10;000 feet. First officer got his oxygen mask on and informed ATC. We were cleared to 10;000 feet. Because we were roughly on a downwind and close to the airport; I elected to return to the airport instead of following the QRH procedures. Storms moving into the area was another reason to return. We landed without incident. We completed all checklists normally. Not an overweight landing. This occurred because maintenance allowed a single pack aircraft to operate to a high elevation airport with anti-ice use required. When the right pack kicked off; we were unpressurized. Although the MEL allows for pack deferral; in this case it was a bad decision to allow it. It should have been fixed not deferred. Suggestions: don't operate single pack to a high elevation runway.
Original NASA ASRS Text
Title: B737-800 flight crew reported they were dispatched with one pack inoperative; and they elected to return to departure airport after the remaining pack failed because of a bleed trip.
Narrative: Aircraft had left pack deferred and off. Right pack seemed to be functioning normally. Normal climb out [from the high elevation airport] via radar vectors. Passing approximately 13;000 feet; Bleed Trip Off light illuminated; cabin pressure was lost; and cabin altitude horn sounded and light illuminated. I immediately began a descent to 10;000 feet. FO got his oxygen mask on and informed ATC. We were cleared to 10;000 feet. Because we were roughly on a downwind and close to the airport; I elected to return to the airport instead of following the QRH procedures. Storms moving into the area was another reason to return. We landed without incident. We completed all checklists normally. Not an overweight landing. This occurred because maintenance allowed a single pack aircraft to operate to a high elevation airport with anti-ice use required. When the right pack kicked off; we were unpressurized. Although the MEL allows for pack deferral; in this case it was a bad decision to allow it. It should have been fixed not deferred. Suggestions: Don't operate single pack to a high elevation runway.
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.