Service difficulty report · Modulating Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- July 2, 2022
- Submitted
- July 6, 2022
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 60576
- Aircraft time
- 24,728 hours, 7,747 cycles
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 26396
- Condition
- Faulty
- Location
- Left Ecs Bay
- Part time
- 21,347 hours, 6,705 cycles
- Stage of operation
- NR
- How discovered
- V
- 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 CABIN ZONE TEMP LIGHT ON MASTER RECALL. EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. PER B737-900 FIM 21-62 TASK 842 PERFORMED TEMP CONTROLLER #2 BITE - FAULT ACTIVE & SHOWS FLT DECK TRIM VALVE. REMOVED & REPLACED FLT DECK TRIM VALVE REF B737-900 AMM 21-61-21, LEAK CHECK GOOD, ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST REF AMM 21-61-00-700-806-002, NO FAULT FOUND.