Service difficulty report · Valve · Boeing 777222

Difficulty date
January 3, 2012
Submitted
January 26, 2012
Operation
Air carrier
Aircraft
N228UA
Make and model
Boeing 777222
Aircraft serial
30556
Aircraft time
42,121 hours, 5,141 cycles
Engine
Pwa PW40903
Part
Valve
Part number
8102142
Part serial
153
Condition
Failed
Location
Lt A/C Pack
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
D

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

What was found

A/C PACK MODE, LEFT PACK ACM HAS FAILED, OR LEFT ECONOMY COOLING VALVE FAILED TO OPEN, OR BOTH LEFT CONDENSOR INLET TEMP SENSORS FAILED. LEFT PACK IS OPERATING IN A NON-NORMAL MODE (HEAT EXCHANGER ONLY COOLING MODE). LOW LIMIT VALVE IN OPEN POSITION. ELECTRICAL CONNECTOR REMOVED AND TIED BACK. FOUND LEFT PACK LOW LIMIT VALVE ELECTRICAL RECEPTICLE LOOSE, PLUG WOULD NOT SECURE. REPLACED PACK LOW LIMIT & TURBINE BYPASS VALVE PER MM. OPS CHECKED NORMAL. NO MESSAGES.