Service difficulty report · Line · Boeing 747422

Difficulty date
August 29, 2012
Submitted
September 28, 2012
Operation
Air carrier
Aircraft
N174UA
Make and model
Boeing 747422
Aircraft serial
24381
Aircraft time
88,153 hours, 9,845 cycles
Engine
Pwa PW4056
Part
Line
Condition
Leaking
Location
Nr 3 Engine
Stage of operation
NR
How discovered
9
Nature of condition
K
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 FUEL LEAK, TRACED FUEL DRAIN SYSTEM AND FOUND AN ACCUMULATION OF FUEL COMING FROM THE TURBINE CASE COOLING ACTUATOR. REPLACED TURBINE CASE COOLING AIR VALVE ACTUATOR PER MM. DURING ENGINE RUN FUEL STILL DRIPPING FROM NR 1 STRUT DRAIN. FOUND FUEL LINE FROM FUEL-OIL COOLER TO FUEL PUMP LEAKING. REPLACED LINE PER MM. RAN ENGINE FOR 5 MINUTES NO LEAKS FOUND.