Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
May 19, 2022
Submitted
May 25, 2022
Operation
Air carrier
Aircraft
N516AS
Make and model
Boeing 737890
Aircraft serial
39044
Aircraft time
48,932 hours, 14,551 cycles
Part
Modulating Valve
Part number
3989086
Part serial
35944
Condition
Inoperative
Location
Left Ecs Bay
Part time
1,431 hours, 389 cycles
Stage of operation
NR
How discovered
V
Nature of condition
J
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FLIGHT DECK PRIMARY TEMP CONTROLLER INOP. GROUNDED - YES. REMOVE AND REPLACED TRIM MODULATING VALVE FOR CONT CABIN PER B737-800 AMM 21-61-21. OPS CHK GOOD.