Service difficulty report · Modulating Valve · Boeing 737990ER

Difficulty date
October 23, 2023
Submitted
October 25, 2023
Operation
Air carrier
Aircraft
N459AS
Make and model
Boeing 737990ER
Aircraft serial
36352
Aircraft time
35,848 hours, 11,235 cycles
Part
Modulating Valve
Part number
3989085
Part serial
20930
Condition
Faulty
Location
Rh Ecs Bay
Part time
33,689 hours, 10,655 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

CONT CAB ZONE TEMP LIGHT ILLUMINATES ON RECALL & RESETS. GROUNDED - YES. (RESOLVED ON W/O: 1971707 TASKCARD: N/R-00003 ) REMOVED OLD AND INSTALLED NEW R/H PRIMARY ZONE TRIM AIR MODULATING VALVE PER MM 21-61-21/401, OPS NORMAL. OPENED, COLLARD, RESET 1 C/B. GROUND VERIFICATION SUCCESSFUL. PLACARDS REMOVED. THIS CLEARS MEL 21-21G. SEAMC ASHRAF NOTIFIED.