Service difficulty report · Modulating Valve · Boeing 777222

Difficulty date
March 1, 2009
Submitted
March 4, 2009
Operation
Air carrier
Aircraft
N784UA
Make and model
Boeing 777222
Aircraft serial
26951
Aircraft time
53,060 hours, 7,751 cycles
Engine
Pwa PW40903
Part
Modulating Valve
Part number
32907449
Part serial
5
Condition
Faulty
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

LEFT ENGINE BLEED FAN AIR MODULATING VALVE (FAMV) FAILED OPEN OR CLOSED OR LEFT AIR SUPPLY AND CABIN PRESSURE CONTROLLER FAILURE. STATUS MSG-3610531 LATCHED ER MODE MSG-3610531 LATCHED ER MODE, MSG-3610200 ACTIVE CL MODE MSG-3610200 ACTIVE CL MODE. *S/D* REMOVED FAMV FOR NR 1 ENGINE. REPLACED FAMV ON NR 1 ENGINE.