Service difficulty report · Float Valve · Boeing 777222

Difficulty date
August 6, 2011
Submitted
September 6, 2011
Operation
Air carrier
Aircraft
N796UA
Make and model
Boeing 777222
Aircraft serial
26931
Aircraft time
60,623 hours, 8,613 cycles
Engine
Pwa PW40903
Part
Float Valve
Condition
Unsecure
Location
Fuel System
Stage of operation
NR
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

FUEL IMBALANCE. FUEL SYSTEM IS CONTINUALLY BEING WRITTEN UP FOR FUEL IMBALANCE. THE SCAVENGE SYSTEM HAS BEEN CHECKED ON CH1904 WITH NO FAULTS FOUND, PLEASE ACCOMPLISH A REFUEL-JETTISON & FUEL FEED MANIFOLD LEAK TEST WITH REFERENCE TO MM. IF REQUIRED MM FOR CHECKING THE FUEL FEED MANIFOLD AND COUPLINGS. DO NOT CLEAR THIS ITEM WITHOUT POSITIVE FINDINGS FOR THE CAUSE OF THE FUEL IMBALANCE. THE LEFT ENGINE IS CONSUMING MORE FUEL THAN THE RIGHT ENGINE, FUEL IMBALANCE EXCEEDS THIS DIFFERENCE. CALL SAMC BEFORE CLEARING THIS ITEM. FOUND RT SCAVENGE SYS WITH A B-NUT NOT SECURED. RECONNECTED & RPLC'D RT OUTLET FLOAT VLV. COMPLETE SYS TEST PER MM, SYS CKS GOOD.