Service difficulty report · Hmu · Boeing 777224

Difficulty date
June 19, 2026
Submitted
June 24, 2026
Operation
Air carrier
Aircraft
N78009
Make and model
Boeing 777224
Aircraft serial
29479
Aircraft time
127,737 hours, 13,096 cycles
Engine
Ge GE9090B
Part
Hmu
Part number
8061689
Part serial
5424
Condition
Faulted
Location
Nr 2 Engine
Part time
49,694 hours, 4,747 cycles
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

RIGHT ENGINE COMPRESSOR STALLED ON ROTATION NO EXCEEDENCES. PERFORMED FAULT ISOLATION NR 2 ENG IAW FIM 71-05, TASK 807, STEPS A - E, NO DEFECTS NOTED. NR 2 ENGINE BORESCOPE PLUGS REMOVAL & INSTALL CONTINUED FAULT ISOLATION PROCEDURE ON FIM 71-05, TASK 807, STEP E (1) THRU (B) 2), ENG CONTROL RT OR ENG EEC C1 R MESSAGES NOT PRESENT. ALSO ON EXISTING SCHEDULED MAINTENANCE TASK SCREEN ENG EEC C2 R MSG NOT PRESENT. CONTINUED FAULT ISOLATION PROCEDURE ON FIM 71-05 TASK 807 - STEP E.(2). IP CHECK VALVE FOUND TO BE SERVICABLE. R & R NR 2 ENGINE HMU. CONTINUED WITH FIM 71-05 TASK 807 FROM STEP E.(6)(A). NO STATUS OR MX MESSAGES PRESENT. R & R NR 2 ENGINE HMU IAW AMM UP TO AND INCLUDING STEP. I. (11)(G)1). .