Service difficulty report · Hmu · Boeing 737824

Difficulty date
May 30, 2020
Submitted
May 31, 2020
Operation
Air carrier
Aircraft
N87507
Make and model
Boeing 737824
Aircraft serial
31637
Aircraft time
41,498 hours, 14,419 cycles
Engine
Cfmint CFM567B262
Part
Hmu
Part number
4935413
Condition
Failed
Location
Nr 1engine
Stage of operation
DE
How discovered
O
Nature of condition
X
Precautionary procedure
A

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

What was found

NUMBER ONE ENG FAILED AFTER GOING TO FLT IDLE. PERFORMED TASK CARD FIM 73-05-810-805-F00 NO VISUAL DAMAGE NOTED. BORESCOPE PERFORMED, NO DAMAGE FOUND. ON STARTUP OF NR 1 ENG WENT UP TO OPERATING PARAMETERS, AFTER NR 2 ENG START UP, NR 1 ENG LOST FUEL FLOW AUTOMATIC SHUTDOWN, ENG FAIL LIGHT, STILL NO CONTROL OF THROTTLE BEFORE SHUTDOWN. ADVISED TO CHANGE FUEL PUMP AND HMU. BOTH FUEL PUMP AND HMU CHANGED OUT DUE TO FAILURE. REMOVAL AND INSTALL. AND TT INFORMATION REF AMM 73-11-11. OPERATIONS CHECKS AND LEAK CHECKS GOOD.