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B757 captain reported that during initial climbout the number 1 engine failed to produce normal thrust. The flight returned to the departure airport.
| Attributes | |
| ACN | 1474684 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine Control |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Experienced asymmetric thrust on climb out. First officer was PF. EPR (engine pressure ratio) gauges were aligned but N1; egt; ff; N2 were all 30 to 40 percent apart. We selected manual throttles and to balance the symmetry of flight. We could not increase the left engine without overshooting the max EPR. At that point the left engine was max EPR and all other gauges where reduced from the right engine by 30 to 40 percent. We leveled at 10;000 ft and observed very little thrust to accelerate or climb. Observing our lack of thrust we elected to return to ZZZ. At this point maintenance speculated a bad PT7 probe on the left engine.
Original NASA ASRS Text
Title: B757 Captain reported that during initial climbout the Number 1 engine failed to produce normal thrust. The flight returned to the departure airport.
Narrative: Experienced asymmetric thrust on climb out. FO was PF. EPR (Engine Pressure Ratio) gauges were aligned but N1; EGT; FF; N2 were all 30 to 40 percent apart. We selected manual throttles and to balance the symmetry of flight. We could not increase the left engine without overshooting the max EPR. At that point the left engine was max EPR and all other gauges where reduced from the right engine by 30 to 40 percent. We leveled at 10;000 ft and observed very little thrust to accelerate or climb. Observing our lack of thrust we elected to return to ZZZ. At this point Maintenance speculated a bad PT7 probe on the left engine.
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.