Service difficulty report · Modulating Valve · Boeing 777222

Difficulty date
July 19, 2009
Submitted
July 20, 2009
Operation
Air carrier
Aircraft
N774UA
Make and model
Boeing 777222
Aircraft serial
26936
Aircraft time
54,374 hours, 10,747 cycles
Engine
Pwa PW4077
Part
Modulating Valve
Part number
32907449
Part serial
27
Condition
Failed
Location
Bleed Air Sys
Stage of operation
NR
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

BLEED FAMV L LEFT ENGINE BLEED FAN AIR MODULATING VALVE (FAMV) FAILED OPEN OR CLOSED OR LEFT AIR SUPPLY AND CABIN PRESSURE CONTROLLER FAILURE. STATUS MSG01- LATCHED CLIMB MODE DEPENDENT; FAN AIR MODULATING VALVE (LEFT) FAILED CLOSED. DB- AIR SUPPLY & CABIN PRESSURE CONTROLLER (L) MSG-3610180 LATCHD CL MODE. REMOVE AND INSTALL NEW FAN AIR MODULATING VALVE. RAN ENGINE, NO MESSAGE. ALL OPS CHECK GOOD.