Service difficulty report · Probe · Boeing 777222

Difficulty date
February 12, 2011
Submitted
February 24, 2011
Operation
Air carrier
Aircraft
N787UA
Make and model
Boeing 777222
Aircraft serial
26939
Aircraft time
60,429 hours, 8,976 cycles
Engine
Pwa PW4090
Part
Probe
Part number
5042KTU01
Condition
Faulty
Location
Center Fuel Tank
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

FUEL TRANSFER WHEN NOT COMMANDED. CTR TANK SCAVENGES EARLY AND ONLY TO LT MAIN TANK. APPROX 40,000 LBS IN THE WING TANKS, WHEN SCAVENGING STARTED, SUSPECT LT OUTLET FLOAT VALVE POSSIBLY OPENS TOO EARLY. NO TIME TO ACCOMPLISH TEST PER FIM. NO FAULTS FOUND OUTLET FLOAT TESTED OK WITH 32.3K FUEL. FOLLOWED FIM 28-22 TASK 849. 49,000 LBS OF FUEL WAS PUT INTO EACH WING. AIRPLANE SAT FOR SEVERAL HOURS WITH NO TRANSFER OF FUEL TO CENTER TANK. FUEL WAS TRANSFERED FROM CTR TANK TO WING VIA SCAVENGE SYSTEM. TEST WAS ACCOMPLISH FROM PAGE 298.31 TO PAGE 298.3 ITEM J7, SCAVENGE SYSTEM OK. NO TRANSFER ISSUE.