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Air carrier flight crew reported executing a rejected takeoff due to asymmetrical engine power produced when setting takeoff power.
| Attributes | |
| ACN | 1678013 |
| Time | |
| Date | 201908 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 462 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 347 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
We were cleared for takeoff on runway X from ZZZ tower. After aligning the aircraft with the runway centerline; the captain pushed the throttles to approximately 40% N1 for stabilization check. After; he moved the throttles forward to the takeoff setting and pressed the to/GA button. Almost immediately the left engine went to approximately 90% N1 and the right remained at approximately 40% N1. The resulting asymmetric thrust forced the aircraft to the right. The captain confirmed the reject and brought the throttles to idle while controlling the aircraft with rudder and tiller. I contacted ZZZ tower regarding the reject and asked for the fire trucks due to the unknown condition. We reached an approximate speed of approximately 15 knots and was able to exit at taxiway east where we waited for the fire chief to release us. The captain opted to have the aircraft towed to the gate. We terminated at the gate uneventfully. Recommend continuing highlighting asymmetric thrust on initial takeoff at the training center. This entire event was very sudden and quick in duration.
Original NASA ASRS Text
Title: Air carrier flight crew reported executing a rejected takeoff due to asymmetrical engine power produced when setting takeoff power.
Narrative: We were cleared for takeoff on Runway X from ZZZ Tower. After aligning the aircraft with the runway centerline; the Captain pushed the throttles to approximately 40% N1 for stabilization check. After; he moved the throttles forward to the takeoff setting and pressed the TO/GA button. Almost immediately the left engine went to approximately 90% N1 and the right remained at approximately 40% N1. The resulting asymmetric thrust forced the aircraft to the right. The Captain confirmed the reject and brought the throttles to idle while controlling the aircraft with rudder and tiller. I contacted ZZZ Tower regarding the reject and asked for the fire trucks due to the unknown condition. We reached an approximate speed of approximately 15 knots and was able to exit at Taxiway E where we waited for the Fire Chief to release us. The Captain opted to have the aircraft towed to the gate. We terminated at the gate uneventfully. Recommend continuing highlighting asymmetric thrust on initial takeoff at the Training Center. This entire event was very sudden and quick in duration.
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.