Service difficulty report · Switch · Boeing 777222

Difficulty date
December 16, 2010
Submitted
December 28, 2010
Operation
Air carrier
Aircraft
N797UA
Make and model
Boeing 777222
Aircraft serial
26924
Aircraft time
56,894 hours, 8,172 cycles
Engine
Pwa PW4090
Part
Switch
Part number
8102044
Condition
Faulty
Location
Priority Valve
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

PACK FCV L ONE (BUT NOT BOTH) OF THE 2 LT PACK FLOW CONTROL VALVES (FCV) ARE NOT IN THE COMMANDED POSITION. STATUS MSG01- LATCHED CRUISE MODE DEPENDENT; FLOW CONTROL VALVE PROXIMITY SWITCH FAILED. DB- CABIN TEMP CONTROLLER (L CHAN2) MSG02- LATCHED CRUISE MODE DEPENDENT; FLOW CONTROL VALVE PROXIMITY SWITCH IS FAILED. MSG03- NOT ACTIVE CRUISE INTERMITTENT; CABIN TEMPERATURE CONTROLLER (L CHAN1) IS USING DEFAULT SIGNAL FROM ASCPC-L. DB- CABIN TEMPERATURE CONTROLLER (L CHAN1) MSG04- NOT ACTIVE CRUISE INTERMITTENT; CABIN TEMPERATURE CONTROLLER (L CHAN1) IS USING DEFAULT SIGNAL FROM ASCPC-L. MSG-2124303 LATCHED ER MODE MSG-2124303 LATCHD ER MODE MSG-2125501 INACTV ER INTER MSG-2125501 INACTV ER INTER. NEED TO REPLACE UPPER FCV, NO STOCK.