Service difficulty report · Modulating Valve · Boeing 737890
FAA SDR system
- Difficulty date
- January 9, 2021
- Submitted
- January 13, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35683
- Aircraft time
- 49,289 hours, 14,846 cycles
- Part
- Modulating Valve
- Part number
- 3989083
- Part serial
- 11847
- Condition
- Faulty
- Location
- Left Ecs Bay
- Part time
- 13,714 hours, 4,140 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
ZONE TEMP LIGHT ILLUMINATES AT CONT CAB AFTER MASTER CAUTION RECALL. GROUNDED-YES. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST, REF B737-800 AMM 21-61-00-700-806-002. FOUND FLT DECK TRIM VALVE FAULT. REMOVED AND REPLACED FLT DECK TRIM VALVE OPERATIONS TESTED AND LEAK CHECK GOOD, REF AMM 21-61-00-700-806-002 AND AMM 21-61-21.