Service difficulty report · Control Valve · Boeing 737890

Difficulty date
May 31, 2017
Submitted
June 2, 2017
Operation
Air carrier
Aircraft
N512AS
Make and model
Boeing 737890
Aircraft serial
39043
Aircraft time
33,903 hours, 10,241 cycles
Part
Control Valve
Part number
3989083
Part serial
2397
Condition
Malfunctioned
Location
Lt A/C Pack
Part time
67,759 hours, 30,331 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 ON MASTER CAUTION RECALL. LIGHT EXTINGUISHED ON RESET. ACFT GROUNDED. ACCOMPLISHED A PACK-ZONE TEMP CONTROLLER BITE TEST IAW 21-61-00. FOUND THE TCV LIGHT ON LT PACK. REPLACED THE LT TEMP CONTROL VALVE IAW AMM 21-51-10. LEAK CHECKED GOOD, NO FAULTS NOTED.