Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
October 16, 2023
Submitted
October 18, 2023
Operation
Air carrier
Aircraft
N518AS
Make and model
Boeing 737890
Aircraft serial
35693
Aircraft time
53,359 hours, 15,745 cycles
Part
Modulating Valve
Part number
3989083
Part serial
11575
Condition
Faulty
Location
Left Ecs Bay
Part time
53,359 hours, 15,737 cycles
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

TECH SERVICE REQUEST. FOLLOW UP TO REPORT OF CONTROL CABIN ZONE TEMP ON RECALL.PRI2. GROUNDED - YES. (RESOLVED ON W/O: 1973340 TASKCARD: N/R-00004 ) PER. TECH SERVICE REQUEST (TSR), REMOVED AND REPLACED CONTROL CABIN TRIM AIR MODULATING (CONTROL) VALVE I.A.W. AMM 21-61-21. OPS CK AND LEAK CK GOOD. JCLARKSON 16226PERFORMED BITE OF CONTROLLERS REF AMM 21-61-00. JHONG 60974THIS CLEARS TSR715110, SEAMC.