- Difficulty date
- January 26, 2019
- Submitted
- January 30, 2019
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35686
- Aircraft time
- 42,608 hours, 12,850 cycles
- Part
- Hmu
- Part number
- 442369
- Part serial
- BECW0360
- Condition
- Failed
- Location
- Nr 1 Engine
- Part time
- 49,047 hours, 17,004 cycles
- Stage of operation
- TX
- How discovered
- O
- Nature of condition
- R
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON STARTUP NR 1 ENGINE N1 RPM 16.1%, N2 RPM 50.5%, BOTH WELL BELOW IDLE RPM. ALSO, NR 1 ENGINE WOULD NOT ACCELERATE ABOVE 16.1% N1. GROUNDED - YES. REMOVED & REPLACED FUEL PUMP PACKAGE REF AMM 73-11-01 AND HMU PER TASK CARD N8473000/N8473001. ALSO REMOVED & REPLACED SERVO FUEL HEATER REF AMM 73-11-07 AND MAIN OIL/FUEL HEAT EXCHANGER REF AMM 79-21-02. OPS & LK CKS GOOD. ENGINE ACCELERATION TO 80%N1, ENG IDLE NORMAL.