Service difficulty report · Valve · Boeing 777222

Difficulty date
June 12, 2011
Submitted
June 13, 2011
Operation
Air carrier
Aircraft
N798UA
Make and model
Boeing 777222
Aircraft serial
26928
Aircraft time
58,708 hours, 8,564 cycles
Engine
Pwa PW40903
Part
Valve
Condition
Failed
Location
Fuel System
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

CENTER TANK SCAVENGE SYSTEM TRANSFERED FUEL BEFORE MAINS REACHED 50000LB SAMC TEXT: FUEL SHEET NOTED WITH \NR 2 TANK VTO EARLY'. FUEL SCAVENGE SYS FUNCTIONALTEST IAW MM. FOUND BOTH OUTLET FLOAT VALVES FAILED OPEN. FUEL KEEPS SCAVENGING FROM CTR TANK TO BOTH LEFT AND RIGHT MAIN TANKS. NEED RPL VALVES. PARTS NIL AT PEK. DF PER MEL. CTR TANK REMAINS EMPTY.