Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
July 25, 2023
Submitted
July 27, 2023
Operation
Air carrier
Aircraft
N519AS
Make and model
Boeing 737890
Aircraft serial
36482
Aircraft time
52,179 hours, 15,401 cycles
Part
Modulating Valve
Part number
3989083
Part serial
2140
Condition
Faulty
Location
Cabin Temp
Part time
99,850 hours, 43,447 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

ILLUMINATION OF ZONE TEMP FWD LIGHT DURING MASTER CAUTION RECALL, LIGHT EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. GROUNDED - YES. PERFORMED BITE REF AMM 21-6100 PRV FLT ZONE TRIM VALVE FAULT REPLACED FWD CAB ZONE TRIM VALVE REF AMM 21-61-21 MIG51A INSTALLED/REMOVED OPS CHECK GOOD THIS CLEARS MEL 21-19G PLACARD REMOVED SEAMC ASHRAF NOTIFIED.