Service difficulty report · Control Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- December 22, 2017
- Submitted
- December 26, 2017
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36355
- Aircraft time
- 15,360 hours, 5,117 cycles
- Part
- Control Valve
- Part number
- 3989085
- Part serial
- 20271
- Condition
- Failed
- Location
- Lt A/C Pack
- Part time
- 16,394 hours, 5,383 cycles
- Stage of operation
- DE
- 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
DURING DESCENT CHECKLIST, CONTROL CAB ZONE TEMP LIGHT ILLUMINATED DURING RECALL. CANCELS DURING MASTER CAUTION RESET. ACFT GROUNDED. CONFIRMED FAULT, NR 2 PACK/ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00-700-806-002 SHOWS (V143), FLIGHT DECK TCV FAILED. REMOVED & REPLACED THE TCV IAW AMM 21-61-21, LEAK CHECKED & GROUND FUNCTIONAL CHECKED NORMAL.