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Dispatcher is informed by a B737-700 captain of a momentary rollback of N1 from 85%-70% on both engines which occurred shortly after takeoff. The aircraft was deiced prior to takeoff and maintenance control elects to have the flight divert for maintenance inspection.
| Attributes | |
| ACN | 1247986 |
| Time | |
| Date | 201503 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| 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 | Dispatcher |
| Qualification | Dispatch Dispatcher |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Dispatch was notified by the crew of a momentary rollback of N1 from 85%-70% on both engines which occurred shortly after takeoff. Autothrottles were in use. Captain stated that throttle levers did not move during the rollback. Upon noticing the rollback the captain immediately pushed the throttles forward. The engines regained full power and there were no further fluctuations from that point forward. All engine parameters remained normal. After regaining full power all checklists were completed and QRH was referenced by the crew. Maintenance control was brought into the discussion. The captain stated that before departure; the aircraft had been de-iced for approximately 40 min. This deicing included removal of ice from beneath both engines. Captain stated that both engines were shut down prior to the de-icing process. Engine start-up after de-icing; taxi; and takeoff roll were normal. The decision to divert was made so that the aircraft engines could be inspected and data downloaded to determine a possible cause of the rollback.
Original NASA ASRS Text
Title: Dispatcher is informed by a B737-700 Captain of a momentary rollback of N1 from 85%-70% on both engines which occurred shortly after takeoff. The aircraft was deiced prior to takeoff and Maintenance Control elects to have the flight divert for maintenance inspection.
Narrative: Dispatch was notified by the crew of a momentary rollback of N1 from 85%-70% on both engines which occurred shortly after takeoff. Autothrottles were in use. Captain stated that throttle levers did not move during the rollback. Upon noticing the rollback the Captain immediately pushed the throttles forward. The engines regained full power and there were no further fluctuations from that point forward. All engine parameters remained normal. After regaining full power all checklists were completed and QRH was referenced by the crew. Maintenance Control was brought into the discussion. The Captain stated that before departure; the aircraft had been de-iced for approximately 40 min. This deicing included removal of ice from beneath both engines. Captain stated that both engines were shut down prior to the de-icing process. Engine start-up after de-icing; taxi; and takeoff roll were normal. The decision to divert was made so that the aircraft engines could be inspected and data downloaded to determine a possible cause of the rollback.
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.