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A B737-400's right pack had been MEL'ed for nine days. During departure; the left pack tripped causing the loss of pressurization. The flight returned to the departure airport.
| Attributes | |
| ACN | 870040 |
| Time | |
| Date | 201001 |
| 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 | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning and Pressurization Pack |
| Person 1 | |
| Function | Captain Check Pilot |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
The aircraft was dispatched with the right pack inop. A maintenance control writeup cleared a left pack trip that occurred on descent the previous day. After takeoff at 3;500 MSL the left pack tripped resulting the loss of pressurization. We returned to the departure airport. All pertinent checklists and procedures were complied with. A normal approach and landing followed. Maintenance log entry made at gate. The right pack was on MEL for nine days. Nine days on a single pack operation is unacceptable.
Original NASA ASRS Text
Title: A B737-400's right pack had been MEL'ed for nine days. During departure; the left pack tripped causing the loss of pressurization. The flight returned to the departure airport.
Narrative: The aircraft was dispatched with the right pack inop. A Maintenance Control writeup cleared a left pack trip that occurred on descent the previous day. After takeoff at 3;500 MSL the left pack tripped resulting the loss of pressurization. We returned to the departure airport. All pertinent checklists and procedures were complied with. A normal approach and landing followed. Maintenance log entry made at gate. The right pack was on MEL for nine days. Nine days on a single pack operation is unacceptable.
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.