Service difficulty report · Shutoff Valve · Boeing 777222

Difficulty date
November 5, 2010
Submitted
November 8, 2010
Operation
Air carrier
Aircraft
N783UA
Make and model
Boeing 777222
Aircraft serial
26950
Aircraft time
60,497 hours, 8,764 cycles
Engine
Pwa PW4090
Part
Shutoff Valve
Condition
Inoperative
Location
Bleed System
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
D

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

What was found

UPON TAXI OUT, RT BLEED WENT INOPERATIVE. FOUND HPSOV ON NR 2 ENG BINDING, LUBRICATED. PERFORMED OPERATIONAL CHECK WITH ENGINE RUNNING. RT BLEED SYSTEM OPERATION OK. WORK PERFORMED BY BAHMM. DUE NUMEROUS DELAYS. PREVIOUS MAINTENANCE STATION HAD FOUND MANUAL OVERRIDE LEVER STUCK AND BINDING. THIS MAY CAUSE INCORRECT OVER PRESSURE SIGNAL TO PRSOV CAUSING A CHRONIC PRSOV PROBLEM ON THIS ACFT. HPSOV MUST BE REPLACED W-O DEVIATION. REPLACED HPSOV IAW AMM, OPS CHECKS GOOD.