What was found
L PACK LIGHT STAYS ON WITH MASTER CAUTION RECALL, LIGHT RESETS WITH RESET, TEMPERATURE NORMAL. GROUNDED - YES. REMOVED AND REPLACED ZONE TRIM AIR MODULATING VALVE. REF AMM 21-61-21-000-801. OPS CHECKS GOOD. PLACARDS REMOVED.
- Difficulty date
- December 12, 2021
- Submitted
- December 16, 2021
- Operation
- Air carrier
- Aircraft
- N487AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44108
- Aircraft time
- 22,674 hours, 7,049 cycles
- System (JASC)
- 2150 · Cabin Cooling System
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 2705
- Condition
- Faulty
- Location
- Left Ecs Bay
- Part time
- 76,629 hours, 35,591 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.