SDR AALA2020071319010

Service difficulty report · Hmu · Boeing 737823

Difficulty date: July 10, 2020
Submitted: July 13, 2020
Operation: Air carrier
Aircraft: N942NN
Make and model: Boeing 737823
Aircraft serial: 33492
Aircraft time: 20,099 hours, 7,732 cycles
Engine: Cfmint CFM567B27E
Engine time: 20,107 hours, 7,736 cycles
System (JASC): 7320 · Fuel Controlling System
Part: Hmu
Part number: 442653
Condition: Malfunctioned
Location: Nr 1 Engine
Stage of operation: TO
How discovered: O
Nature of condition: J
Precautionary procedure: C

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AIRCRAFT GROUNDED - ABORTED TAKEOFF - ENGINE NO. 1 WOULD NOT REACH TAKE-OFF THRUST, STALLED AT 85% N1. LOW SPEED REJECTED TAKE-OFF AT 70 KIAS (SECOND EVENT). REMOVED AND REPLACED HMU (HYDROMECHANICAL UNIT), ENGINE 1, PER JOB CARD 08L40073001, OPERATIONAL CHECK NORMAL. REMOVED AND REPLACED FUEL PUMP (AALA202007129009), ENGINE 1, PER AMM 73-11-01-400-801, OPERATIONAL CHECK GOOD. [SEE AALA202007109002 FOR ORIGINAL EVENT.]