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A B737 flight crew reported that one engine did not make takeoff thrust resulting in a rejected takeoff.
| Attributes | |
| ACN | 1569089 |
| Time | |
| Date | 201808 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 220 Flight Crew Total 25000 Flight Crew Type 2883 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 23000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On takeoff after toga engagement the number 1 engine accelerated to about 85% N1 which was about 10% less than the 94.1% achieved by the number 2 engine and called for by the reduced thrust takeoff data message. The throttles were miss matched with the number 1 engine throttle more than 1 knob width behind engine number 2. As I advanced the number 1 throttle to try and match thrust with the number 2 engine I noticed the number 1 N1 decreased while the number 1 egt (exhaust gas temperature) increased which is the opposite of what should have happened. At that moment I made the decision to perform a low speed rejected T/O at approximately 70-75 knots. The runway was cleared about half way down using very little braking and the quick reference checklist; QRH and brake cooling tables were then consulted. I called and alerted [maintenance] as to the situation and we returned to the gate. An elb (electronic logbook) maintenance fault report was sent at that time.
Original NASA ASRS Text
Title: A B737 flight crew reported that one engine did not make takeoff thrust resulting in a rejected takeoff.
Narrative: On takeoff after TOGA engagement the Number 1 engine accelerated to about 85% N1 which was about 10% less than the 94.1% achieved by the Number 2 engine and called for by the reduced thrust takeoff data message. The throttles were miss matched with the Number 1 engine throttle more than 1 knob width behind engine Number 2. As I advanced the Number 1 throttle to try and match thrust with the Number 2 engine I noticed the Number 1 N1 decreased while the Number 1 EGT (Exhaust Gas Temperature) increased which is the opposite of what should have happened. At that moment I made the decision to perform a low speed rejected T/O at approximately 70-75 knots. The runway was cleared about half way down using very little braking and the quick reference checklist; QRH and brake cooling tables were then consulted. I called and alerted [Maintenance] as to the situation and we returned to the gate. An ELB (electronic logbook) maintenance fault report was sent at that time.
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.