Service difficulty report · Wire Harness · Boeing 777222

Difficulty date
January 10, 2013
Submitted
February 1, 2013
Operation
Air carrier
Aircraft
N793UA
Make and model
Boeing 777222
Aircraft serial
26946
Aircraft time
68,118 hours, 9,745 cycles
Engine
Pwa PW40903
Part
Wire Harness
Condition
Chafed
Location
Fire Loop
Stage of operation
IN
How discovered
C
Nature of condition
L
Precautionary procedure
K

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

What was found

LEFT ENGINE OVERHEAT DETECTION CIRCUIT 2 FAILED. MEASURED LEFT ENGINE LOOP 2 INDIVIDUAL ELEMENT CORE RESISTANCE AND MEGGER RESISTANCE TO GROUND, FOUND TO BE WITHIN LIMITS OF FIMMAN 26-11-810. FOUND CHAFED WIRE HARNESS AT RIGHT SIDE ENGINE, 2 FT FWD OF 'LWR AFT LOOP' UPPER END - FWD SIDE RACEWAY, UNDER FWD MOST CLAMP. REPLACED FIRE LOOP HARNESS AND FIRE TESTED OK AND NEW MESSAGES DISPLAYED.