Service difficulty report · Modulating Valve · Boeing 737890
FAA SDR system
- Difficulty date
- March 1, 2021
- Submitted
- March 4, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35176
- Aircraft time
- 54,565 hours, 15,931 cycles
- Engine
- Cfmint CFM567B27
- Part
- Modulating Valve
- Part number
- 3989085
- Part serial
- 13608
- Condition
- Seized
- Location
- Right Ecs Bay
- Part time
- 37,903 hours, 11,591 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
RH PACK LIGHT ILLUMINATED ON MASTER CAUTION RECALL, RESETS WHEN MASTER CAUTION LIGHT SWITCH IS PRESSED. GROUNDED - YES. TROUBLE SHOOTING REVEALED THAT RH TEMP CONTROL VALVE HAS FAILED, SEIZED CLOSED. REMOVED AND REPLACED TRIM MODULATING VALVE REF B737-800 AMM 21-61-21. OPS CHECK GOOD.