Service difficulty report · Control Unit · Boeing 747422

Difficulty date
January 17, 2010
Submitted
February 8, 2010
Operation
Air carrier
Aircraft
N118UA
Make and model
Boeing 747422
Aircraft serial
28811
Aircraft time
43,967 hours, 5,392 cycles
Engine
Pwa PW4056
Engine time
64,479 hours, 7,681 cycles
Part
Control Unit
Part number
40885
Part serial
12195
Condition
Faulty
Location
Refuel Sys
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
E, A

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

What was found

FUEL LEAK, FLT DIVERTED. REMOVED IB REFUEL CONTROL UNIT FOR 3 MAIN FUEL TANK. REPLACED IB REFUEL CONTROL UNIT FOR 3 MAIN FUEL TANK. REMOVED OTBD REFUEL CONTROL UNIT FOR 3 MAIN FUEL TANK. REPLACED OB REFUEL CONTROL UNIT FOR 3 MAIN FUEL TANK. ACP'D OP CHK AND LEAK CHECK FOR BOTH INBD AND OTBD CONTROLLERS AND REFUEL VALVES. NO DEFECTS NOTED.