Service difficulty report · Control Valve · Boeing 737890
FAA SDR system
- Difficulty date
- October 28, 2019
- Submitted
- November 6, 2019
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35199
- Aircraft time
- 36,692 hours, 10,757 cycles
- Part
- Control Valve
- Part number
- 3989083
- Part serial
- 9186
- Condition
- Failed
- Location
- Lt A/C Pack
- Part time
- 47,841 hours, 14,462 cycles
- Stage of operation
- NR
- How discovered
- O
- 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
WHEN MASTER RECALL IS PUSHED, CONT CAB "ZONE TEMP" LIGHT ILLUMINATES. "ZONE TEMP" LIGHT EXTINGUISHES WHEN MASTER CAUTION LIGHT IS RESET. GROUNDED - YES. CONFIRMED FAULT, "CONT CAB ZONE" TEMP LIGHT COMES ON WHEN RECALL PRESSED. R/H PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL "FLIGHT DECK" TCV (V143). REMOVED & REPLACED TCV REF B737-800 AMM 21-61-21, R/H PACK/ZONE TEMP CONTROLLER BITE TEST NML REF AMM 21-61-00-700-806-002. L/H PACK/ZONE TEMP CONTROLLER SHOWS NO FAULTS.