Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
January 6, 2019
Submitted
January 9, 2019
Operation
Air carrier
Aircraft
N491AS
Make and model
Boeing 737990ER
Aircraft serial
44109
Aircraft time
12,650 hours, 4,233 cycles
Part
Control Valve
Part number
3989085
Part serial
25499
Condition
Failed
Location
Ac Bay
Part time
12,675 hours, 4,240 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

L PACK LT ON RECALL. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST REF AMM 21-61-00 SHOWS "THIS PACK TCV". REMOVED & REPLACED LT TEMP CONTROL VALVE PER AMM 21-51-10 OPS CHK GOOD. PERFORMED BITE PROCEDURE PER AMM 21-61-00 NO FAULTS FOUND.