Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
March 2, 2018
Submitted
March 6, 2018
Operation
Air carrier
Aircraft
N477AS
Make and model
Boeing 737990ER
Aircraft serial
40716
Aircraft time
10,854 hours, 3,541 cycles
Part
Control Valve
Part number
3989085
Part serial
1704
Condition
Faulted
Location
Lt A/C Pack
Part time
76,367 hours, 36,409 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 ILLUMINATED ON RECALL & RESET ON M/C. ACFT GROUNDED. LEFT CABIN TEMP CONTROLLER BITE DONE IAW FIM 21-62 TASK 801. PACK TCV FAULT ON PREVIOUS FLIGHT, RESET ON VERIFY. BITE GOOD. REMOVED AND REPLACED THE LT TEMPERATURE CONTROL VALVE IAW AMM 21-51-10. OPS CHECKED GOOD.