SDR ASAA2016010814675

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: January 8, 2016
Submitted: January 12, 2016
Operation: Air carrier
Aircraft: N431AS
Make and model: Boeing 737990ER
Aircraft serial: 43255
Aircraft time: 8,693 hours, 2,849 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Control Valve
Part number: 3989084
Part serial: 7737
Condition: Failed
Location: Lt A/C Pack
Part time: 38,966 hours, 12,778 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 ILLUMINATES ON RECALL, GOES OUT WITH MASTER CAUTON RESET. ACFT GROUNDED. PERFORMED PACK TEMP CONTROL BITE PROCEDURE REF FIM 21-62, TASK 801, MAINTENANCE MESSAGE, THIS PACK TCV - MESSAGE SHOWED ON LT CONTROLLER. R & R LT TEMP CONTROL VALVE REF B737-900 AMM 21-51-10, OPS CHECK GOOD.