Service difficulty report · Overheat Loop · Boeing 747451

Difficulty date
July 12, 2012
Submitted
August 24, 2012
Operation
Air carrier
Aircraft
N105UA
Make and model
Boeing 747451
Aircraft serial
26473
Aircraft time
74,177 hours, 8,758 cycles
Engine
Pwa PW4056
Part
Overheat Loop
Part number
644501
Part serial
12749
Condition
Failed
Location
Nr 3 Nacelle
Stage of operation
NR
How discovered
9
Nature of condition
J
Precautionary procedure
O

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

What was found

NR 3 ENGINE OVERHEAT LOOP 'A" FAULT. REPLACED FIRE OVERHEAT DETECTOR TS684 PER AMM.