Service difficulty report · Hmu · Boeing 7378H4

Difficulty date
April 26, 2026
Submitted
April 27, 2026
Operation
Air carrier
Aircraft
N8554X
Make and model
Boeing 7378H4
Aircraft serial
36993
Aircraft time
27,941 hours, 14,127 cycles
Engine
Cfmint CFM567B27E
Part
Hmu
Condition
Leaking
Location
Nr 2 Engine
Stage of operation
CL
How discovered
O
Nature of condition
X, J
Precautionary procedure
A

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

What was found

NUMBER 2 ENG FAILED ON TAKEOFF; REJECT AT APPROX 100 KIAS BRK ENERGY 21.1M FT-LB. INSPECTION REQUIRED ABOVE 30.0M FT-LM. DURING INITIAL EVALUTATION FAULT CODE 73-31552 IS PRESENT IN EEC IAW FIM 73-31, TASK 803. PERFORMED GVI OF NR 2 ENGINE AND DISCOVERED HMU LEAKING FUEL. ACCOMPLISHED AN INSPECTION OF THE NR 2 ENGINE CHIP DETECTORS AND FOUND NO MAGNETIC PARTICLES REF. AMM 79-00-00. R & R FUEL PUMP IAW TASK CARD REF TTG8Q01BW3Y. R & R HMU IAW AMM 73-21-10. REQUIRES TEST 15 - 85% N1 LEAK CHECK PER POWERPLANT TEST REF TABLE 71-00-00. INSPECTED AND VERIFIED THE WORK PERFORMED ON CORRECTIVE ACTION #2; NO DEFECTS NOTED. REMOVED AND REPLACED #2 PUMP REF TTG8Q01BW3Y ON MT 773-11-00; 85% LEAK CHECK GOOD

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