Service difficulty report · Hmu · Boeing 777224

Difficulty date
August 21, 2012
Submitted
August 21, 2012
Operation
Air carrier
Aircraft
N78004
Make and model
Boeing 777224
Aircraft serial
27580
Aircraft time
67,785 hours, 7,178 cycles
Engine
Ge GE9090B
Part
Hmu
Part number
8061687
Part serial
WYG98817
Condition
Malfunctioned
Location
Nr 2 Engine
Part time
48,546 hours, 5,086 cycles
Stage of operation
TO
How discovered
O
Nature of condition
M, J
Precautionary procedure
E, C

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

What was found

RIGHT ENGINE FAILED AND EGT ROSE TO START LIMIT. ENGINE WAS SHUTDOWN. CHECKED MAT FOR CURRENT LEG FAULTS, FOUND 73-31802 AND 73-21002 . TROUBLESHOT IAW FIM 73-22 TASK 815. WITH EEC POWER IN TEST NO FAULTS FOUND . ALSO TROUBLESHOT IAW FIM 73-22 TASK 828. FAULT INTERMITTENT. RAN ENGINE AT IDLE FOR 30 MIN. SHUTDOWN ENGINE AND RESTARTED FOR 20 MIN WITH NO DEFECTS NOTED. ALL ENG PARAMETERS NORMAL. REPLACED THE NR 2 ENGINE HMU.