Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
October 8, 2023
Submitted
October 12, 2023
Operation
Air carrier
Aircraft
N560AS
Make and model
Boeing 737890
Aircraft serial
35179
Aircraft time
62,026 hours, 18,756 cycles
Part
Modulating Valve
Part number
3989083
Part serial
3178
Condition
Faulty
Location
Left Ecs Bay
Part time
69,939 hours, 31,328 cycles
Stage of operation
DE
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

ZONE TEMP CONT CABIN ILLUMINATED ON RECALL AT TOP OF DECENT INTO ANC. EXTINGUISHED ON MASTER CAUTION RESET. GROUNDED - YES. (RESOLVED ON W/O: 1970050 TASKCARD: N/R-00001 ) ACCOMPLISHED PACK/ ZONE TEMP CONTROLLER BITE TEST REF AMM 21-61-21, BITE SHOWS FLT DECK TRIM VALVE. REMOVED AND REPLACED FLIGHT DECK TRIM VALVE (V143) REF AMM 21-61-21. OPS CHECK GOOD. REMOVED PLACARD C/N 08059560. THIS CLEARS MEL 21-21G. SEAMC MITCH NOTIFIED.