Service difficulty report · Isolation Valve · Boeing 777222

Difficulty date
March 21, 2012
Submitted
March 23, 2012
Operation
Air carrier
Aircraft
N773UA
Make and model
Boeing 777222
Aircraft serial
26929
Aircraft time
67,705 hours, 13,010 cycles
Engine
Pwa PW4077
Part
Isolation Valve
Part number
S343T00366
Part serial
50
Condition
Faulty
Location
Apu
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

EICAS MESSAGE APU FUEL ISOLATION VALVE MESSAGE. DEFERRED IAW MEL 2825C APU ISO VALVE DEACTIVATED CLOSED AND DISCONNECTED, CB PULLED AND CAPPED ON P310 PANEL. INSTALLED NEW ISO-VALVE, OPS GOOD, MESSAGE GONE.