Service difficulty report · Sensor · Boeing 777222

Difficulty date
July 5, 2011
Submitted
August 2, 2011
Operation
Air carrier
Aircraft
N786UA
Make and model
Boeing 777222
Aircraft serial
26938
Aircraft time
62,787 hours, 9,166 cycles
Engine
Pwa PW40903
Part
Sensor
Condition
Faulty
Location
Lt Fuel Tank
Stage of operation
CL
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 LEFT AND RIGHT MAIN TANK QUANTITIES DIFFER BY A PRE-DETERMINED AMOUNT. MAN SNAP SHOT SHOWED L TANK NR 14 SENSOR SHOWED 0.0 JUST AFTER TAKEOFF. SENSOR SHOWED 0.0 DURING AND AFTER FUELING. FUEL TANKS STICKED BEFORE FUELING & AFTER FUELING TO CONFIRM TOTAL FUEL ON BOARD. NO MAINT MSG SHOWING ON MAT. REPLACED LT FUEL QUANTITY LEVEL SENSOR NR 14 PER MM. OPS CHECK GOOD. ALL INDICATIONS NORMAL AT THIS TIME. REMOVED FUEL PNL 541EB FOR ACCESS. CLEARED AND CLOSED FUEL PNL 541EB. STATIC CHECK GOOD.