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A B737-700 engine rolled back in flight then stabilized; but after that the flight attendants reported a pop. The flight returned to the departure airport where engine instruments indicated an N1 exceedence.
| Attributes | |
| ACN | 1047401 |
| Time | |
| Date | 201211 |
| 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 | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Last 90 Days 141 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
First flight of the day; climbing out of approximately 12;000 ft with autothrottle on and VNAV climb mode selected. We felt a 'mushy' yaw/roll/pitch change followed by a more pronounced yaw in the opposite direction. I noticed the number one engine had rolled back significantly to the mid 60% range. I assumed the number one engine had failed and disconnected the autothrottle and autopilot. I retarded the number one throttle toward idle and the engine appeared to stabilize. When the engine stabilized; no further abnormal indications were noted. The flight attendants reported hearing a 'pop' just before the event. We ran all checklists and returned to the departure airport. We elected to use flaps 15 for the landing. The remainder of the flight was uneventful. Upon shutdown; a red box appeared around the digital readout of the number one engine N1 indicating an exceedence. Dispatch; maintenance; and the chief pilot were notified. A logbook entry was made.
Original NASA ASRS Text
Title: A B737-700 engine rolled back in flight then stabilized; but after that the flight attendants reported a pop. The flight returned to the departure airport where engine instruments indicated an N1 exceedence.
Narrative: First flight of the day; climbing out of approximately 12;000 FT with autothrottle ON and VNAV climb mode selected. We felt a 'mushy' yaw/roll/pitch change followed by a more pronounced yaw in the opposite direction. I noticed the number one engine had rolled back significantly to the mid 60% range. I assumed the number one engine had failed and disconnected the autothrottle and autopilot. I retarded the number one throttle toward idle and the engine appeared to stabilize. When the engine stabilized; no further abnormal indications were noted. The flight attendants reported hearing a 'pop' just before the event. We ran all checklists and returned to the departure airport. We elected to use flaps 15 for the landing. The remainder of the flight was uneventful. Upon shutdown; a red box appeared around the digital readout of the number one engine N1 indicating an exceedence. Dispatch; Maintenance; and the Chief Pilot were notified. A logbook entry was made.
Data retrieved from NASA's ASRS site as of July 2013 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.