What was found
LEFT PACK LIGHT COMES ON WITH RECALL. IT EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. CONFIRMED FAULT, NR 1 PACK/ZONE TEMP CONTROLLER SHOWS HARD FAIL TCV 1 (V139). REMOVED & REPLACED IAW AMM 21-51-10.
- Difficulty date
- December 18, 2022
- Submitted
- December 22, 2022
- Operation
- Air carrier
- Aircraft
- N493AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41727
- Aircraft time
- 24,294 hours, 7,638 cycles
- System (JASC)
- 2150 · Cabin Cooling System
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 25828
- Condition
- Failed
- Location
- Left Ecs Bay
- Part time
- 21,291 hours, 6,676 cycles
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.