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A transatlantic B767-300 flight crew heading northeast opted to divert to a mainland airport when the left engine began to make uncommanded N1 increases without accompanying thrust lever movement.
| Attributes | |
| ACN | 1102171 |
| Time | |
| Date | 201307 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Well into our transatlantic flight the left engine N1 accelerated multiple times without pilots' input and without throttle movement. Pilots manually reduced power with throttle movement. Dispatch and maintenance control were consulted and ultimately the decision was made to divert to a us airport. The left engine produced good thrust; but was inconsistent and required constant attention and frequent readjustment to keep it near the desired power setting. The pilots reviewed appropriate checklists; including possible single engine scenarios in case they would be needed. An emergency was declared and an overweight landing was performed by the captain at our diversion airport.
Original NASA ASRS Text
Title: A transatlantic B767-300 flight crew heading northeast opted to divert to a mainland airport when the left engine began to make uncommanded N1 increases without accompanying thrust lever movement.
Narrative: Well into our transatlantic flight the left engine N1 accelerated multiple times without pilots' input and without throttle movement. Pilots manually reduced power with throttle movement. Dispatch and Maintenance Control were consulted and ultimately the decision was made to divert to a US airport. The left engine produced good thrust; but was inconsistent and required constant attention and frequent readjustment to keep it near the desired power setting. The pilots reviewed appropriate checklists; including possible single engine scenarios in case they would be needed. An emergency was declared and an overweight landing was performed by the Captain at our diversion airport.
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.