Service difficulty report · Hmu · Boeing 737800*

Difficulty date
March 23, 2022
Submitted
March 23, 2022
Operation
Air carrier
Aircraft
N76515
Make and model
Boeing 737800*
Aircraft serial
31623
Aircraft time
43,707 hours, 15,195 cycles
Part
Hmu
Part number
442653
Part serial
BECW6080
Condition
Failed
Location
#1 Eng
Stage of operation
CR
How discovered
O
Nature of condition
Y
Precautionary procedure
A

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

What was found

NO 1 ENG FAILED AT 340. ATTEMPT RESTART. NOEGT NO RESTART SECTION. REPLACED GASKET REF AMM 73-21-10. RAN ENGINE NO LEAKS NOTED, BUT FUEL WAS SEEPING FROM HMU SIDE CASE COVER. REQUIRES HMU REPLACMENT. ADDED PICTURES. T/S FOUND MSG 73-21551. PERFORMED EEC BITE TEST, TEST PASSED. PERFORMED WET MOTOR REF AMM 71-00-00-700-822-F00. OBSERVED FUEL POURING FROM TOP OF HMU OUTLET TUBE TO FUEL FLOW TRANSMITTER INLET. DISASSEMBLED LINE AND FOUND GASKET SEAL MISSING A R&R #1 ENGINE HMU REF AMM 73-21-10. CARRIED OUT ALL TEST REQUIRED. ALL TEST PASSED. NO LEAKS NOTED. CLOSED AND SECURED COWLS. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1811125 SN OFF 6080 PERFORMED REQUIRED IDT INSPECTION FOR HMU INSTALLATION ON ENG 1. VERIFIED ALL OPS CHECKS AND LEAK CHECKS. REF AMM 73-21-10. UNIT, HYDROMECH OFF 29-7321-9-0012 6080 ON 29-7321-9-0012 0493

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