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SDR CALA2014060591205

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Service difficulty report · Control Valve · Boeing 777222

FAA SDR system

Difficulty date
June 2, 2014
Submitted
June 5, 2014
Operation
Air carrier
Aircraft
N221UA
Make and model
Boeing 777222
Aircraft serial
30552
Aircraft time
54,746 hours, 6,741 cycles
Engine
Pwa PW40903
System (JASC)
2150 · Cabin Cooling System
Part
Control Valve
Condition
Faulty
Location
Ac Bay
Stage of operation
IN
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

BOTH ENG AUTO STARTS FAILED. N2 NOT ABOVE 12 AUTO SHUTDOWN PROG TEXT. FOUND LT PACK UPPER FCV NOT SHUTTING OFF DURING ENG START, WITH LT PACK UPPER FCV DEACTIVATED IAW MEL 2151J ENG START NORMAL. DURING TROUBLESHOOTING CHECKED ALL DUCTS IN PACK BAY AREAS FOR LEAKS & NO LEAKS. WHILE ACCOMPLISHING TROUBLESHOOTING THIS WAS WHEN UPPER FLOW CONTROL VLV DID NOT SHUT OFF. VLV PCN IS 646-9007. REPLACED UPPER LT FLOW CONTROL VLV IAW AMM21-51-01. ACCOMPLISHED AUTO START BOTH ENGS, EVERYTHING CHECKS NORMAL.