Service difficulty report · Modulating Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- June 21, 2020
- Submitted
- June 23, 2020
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43293
- Aircraft time
- 25,487 hours, 8,185 cycles
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 35933
- Condition
- Faulty
- Location
- Left Ecs Bay
- Stage of operation
- TX
- 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
AFTER START MASTER CAUTION RECALL CONT CAB ZONE TEMP ILLUMINATED. EXTINGUISHES UPON RESET. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONT BITE TEST REF B737-900 AMM 21-61-00. FLT DECK TRIM VALVE FAULTED. REMOVED & REPLACED CONT CAB TAV REF AMMM 21-61-000 & 21-61-21-400. OP'S AND LEAK CHECK GOOD.