Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
July 27, 2014
Submitted
July 31, 2014
Operation
Air carrier
Aircraft
N403AS
Make and model
Boeing 737990ER
Aircraft serial
41730
Aircraft time
6,958 hours, 2,195 cycles
Part
Control Valve
Part number
3989084
Part serial
9102
Condition
Malfunctioned
Location
Lt A/C Pack
Part time
27,955 hours, 8,513 cycles
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

LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL. RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. REPLACED LT PACK TEMP CONTROL VALVE (V-139). PACK/ZONE TEMPERATURE CONTROLLER BITE TEST PASSES. NO LEAKS NOTED. REF AMM 21-51-10/401 AND FIM 21-62/830.