Service difficulty report · Modulating Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- December 14, 2022
- Submitted
- December 22, 2022
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41727
- Aircraft time
- 24,241 hours, 7,621 cycles
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 20383
- Condition
- Failed
- Location
- Lt A/C Pack
- Part time
- 27,872 hours, 8,500 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.
What was found
CONT CAB ZONE TEMP ON RECALL. GOES OUT WITH RESET. GROUNDED - YES. CONFIRMED FAULT, NR 2 PACK/ZONE TEMP CONTROLLER SHOWS HARD FAIL "FLIGHT DECK" TCV (V143). REMOVED & REPLACED SAME REF B737-900 AMM 21-61-21. ORIG SUBMISSION DATE: 12/19/2022