Service difficulty report · Hmu · Boeing 737824

Difficulty date
January 9, 2023
Submitted
January 9, 2023
Operation
Air carrier
Aircraft
N78509
Make and model
Boeing 737824
Aircraft serial
31638
Aircraft time
48,497 hours, 16,952 cycles
Engine
Cfmint CFM567B27B3
Part
Hmu
Condition
Inoperative
Location
Nr 1 Engine
Stage of operation
TO
How discovered
O
Nature of condition
R, J
Precautionary procedure
C

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

What was found

LEFT ENGINE UNABLE TO PRODUCE MORE THAN 90.1 WITH A REQUEST FOR MAX RIGHT ENG 100.3 CLOSE TO 80 DEGREES AT IDLE. REMOVED MAIN FUEL PUMP. INSTALLED NR 1 HMU IAW AMM 73-21-10-400-801-F00 UP TO STEP G. INSTALLED MAIN FUEL PUMP IAW AMM 73-11-11-400-801-F00. PERFORMED IAW AMM 73-21-02 VERIFIED LEAK CHECK AND OPS CHECK,GOOD. PERFORMED PP TEST [8], 12, 13, 3A AND 5 ON #1 ENG HMU OPS CHECK SURFACE GASKET (73-21-10-01A ITEM 60). INSTALLED HMU ETS 73-21-10-400-801-F00 UP TO STEP H. (1) LEAK CHECK GOOD. FUEL PUMP INSTALLED. OPS CHECK GOOD, NO LEAKS NOTED.