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B737NG flight crew observed a power setting anomaly between engines; but continued to depart and land without incident. Upon arrival and after crew write-up; the aircraft was taken out of service.
| Attributes | |
| ACN | 1407688 |
| Time | |
| Date | 201612 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 128 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 90 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
We were performing a precautionary takeoff. After setting takeoff thrust with auto throttle; due to max power takeoff and fairly light aircraft; we noted that the number 2 N1 was reading slightly less than the number 1 N1. I then verified that the autothrottle showed armed on the flight mode annunciator (FMA). I then proceeded to push the number 2 engine up to match the number 1 N1; the thrust lever was firewalled; with no change to the number 2 N1.at this point; we were past V1 and rapidly approaching vr. Due to the fact we encountered no wind shear; I was not having any difficulties maintaining control of the aircraft; and we continued our takeoff. I felt that rejecting at that point; would cause a greater safety hazard than continuing the takeoff. Aircraft flew normally on the departure; climb; cruise and approach.the first officer and I discussed the situation with our shared mental model. We both agreed it was the correct decision to make for safety of flight. We landed uneventfully. Logbook entry was made; and maintenance was notified. After troubleshooting; aircraft was taken out of service.
Original NASA ASRS Text
Title: B737NG flight crew observed a power setting anomaly between engines; but continued to depart and land without incident. Upon arrival and after crew write-up; the aircraft was taken out of service.
Narrative: We were performing a precautionary takeoff. After setting takeoff thrust with auto throttle; due to max power takeoff and fairly light aircraft; we noted that the number 2 N1 was reading slightly less than the number 1 N1. I then verified that the autothrottle showed armed on the Flight Mode Annunciator (FMA). I then proceeded to push the number 2 engine up to match the number 1 N1; the thrust lever was firewalled; with no change to the number 2 N1.At this point; we were past V1 and rapidly approaching VR. Due to the fact we encountered no wind shear; I was not having any difficulties maintaining control of the aircraft; and we continued our takeoff. I felt that rejecting at that point; would cause a greater safety hazard than continuing the takeoff. Aircraft flew normally on the departure; climb; cruise and approach.The First Officer and I discussed the situation with our shared mental model. We both agreed it was the correct decision to make for safety of flight. We landed uneventfully. Logbook entry was made; and Maintenance was notified. After troubleshooting; aircraft was taken out of service.
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.