Service difficulty report · Hmu · Boeing 737924ER

Difficulty date
February 10, 2021
Submitted
February 10, 2021
Operation
Air carrier
Aircraft
N78448
Make and model
Boeing 737924ER
Aircraft serial
40003
Aircraft time
28,937 hours, 10,445 cycles
Engine
Cfmint CFM567B26E
Part
Hmu
Condition
Malfunctioned
Location
Nr 1 Engine
Stage of operation
TO
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

THROTLE SPLIT ON T/O FROM ORD W/ENG A/I ON. NEEDED TO PUSH LEFT THROTTLE 1 1/4 KNOB DEBRIFED CREW ON ARRIVAL. #1 ENG THROTTLE HAD TO BE MOVED TO MATCH #2 ENG. ENG#1 N1 89.5 ENG#2 N1 91.8 FOR T/O. DURING CLIMB A/T MATCHED AND A/C FLEW NORMAL. T/S PER FIM TASK 73-05-00-810-808. NO EEC BITE FAULTS FOR INTERNAL EEC STEP E1. PERFORMED STEP E2 REGULATOR READS 2 WITH ENG AT IDLE. TRA READS 36.05 A/B CHANNELS WITH IN LIMITS PER STEP 4. REMOVED #1 ENGINE HMU, FUEL OIL HEAT EXCHANGER/SERVO FUEL HEATER ASSY, AND FUEL PUMP ASSY. INSPECTION NOT NEEDED UNTIL HMU AND FUEL PUMP INSTALLED. SEE LOGPAGES 5841189 FOR FUEL PUMP REPLACEMENT AND 5841183 FOR HMU REPLACEMENT. ALL INSPECTIONS COMPLETED ON ABOVE NOTED LOG PAGES. ALSO ACP''D HIGH POWER RUN. ALL ENGINE INDICATION NORMAL.