What was found
ZONE TEMP LIGHT CONT CAB ILLUMINATES DURING MASTER CAUTION RECALL RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED CONT CAB TRIM MODULATING VALVE REF B737-900 AMM 21-61-21. OPS CHECK GOOD.
- Difficulty date
- November 7, 2021
- Submitted
- November 9, 2021
- Operation
- Air carrier
- Aircraft
- N431AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43255
- Aircraft time
- 29,781 hours, 9,567 cycles
- System (JASC)
- 2160 · Cabin Temperature Control System
- Part
- Modulating Valve
- Part number
- 3989083
- Part serial
- 10844
- Condition
- Faulty
- Location
- Left Ecs Bay
- Part time
- 45,619 hours, 13,967 cycles
- Stage of operation
- NR
- How discovered
- V
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.