Service difficulty report · Scavenge Pump · Boeing 777222

Difficulty date
September 20, 2010
Submitted
September 22, 2010
Operation
Air carrier
Aircraft
N794UA
Make and model
Boeing 777222
Aircraft serial
26953
Aircraft time
56,969 hours, 8,281 cycles
Engine
Pwa PW4090
Engine time
53,648 hours, 8,142 cycles
Part
Scavenge Pump
Condition
Leaking
Location
Nr 1 Eng Oil
Stage of operation
NR
How discovered
9
Nature of condition
K
Precautionary procedure
O

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

What was found

NR 1 ENGINE OIL CONSUMPTION EXCEEDS LIMIT. TROUBLE SHOT IAW FIM 71-05 T830. IAW AD 2003-26-09, IF EXCEEDED 0.5 QT PER HOUR AND NO CAUSE FOUND, BOROSCOPED NR 3 WEEP MM TASK 72-00-88-290-803-N01 WITHIN 100 CYC. BOROSCOPED TUBE AT NR 3 BEARING OIL VENT TUBE FOUND THE TUBE DRY AND CLEAN WITH NO DEBRIS. FOUND SMALL LEAK AT FUEL-OIL COOLER OUTLET MANIFOLD. REPLACED SEALS AND PACKING. IDLE LEAK CHECKED. NO LEAKS NOTED. ACCOMPLISHED FIM TASK 71-08, TASK 819. NO EVIDENCE OF LEAKS. ACCMP'D OIL SYS LEAK CHECK. NO BUBBLES FROM DRAIN TUBES. CHECKED GEAR BOX FOR HIDDEN OIL. 2 CLAMPS LOOSE ON LINES TO SCAVENGE LUBE PUMP. SECURED CLAMPS. COMPLETED MM FOUND NO DISCREPANCIES. REPLACED LUBE SCAVENGE PUMP.