Service difficulty report · Control Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- April 25, 2019
- Submitted
- April 29, 2019
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36362
- Aircraft time
- 19,799 hours, 6,537 cycles
- Part
- Control Valve
- Part number
- 3989085
- Part serial
- 25815
- Condition
- Failed
- Location
- Left Ecs Bay
- Part time
- 12,408 hours, 4,134 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
PACK LIGHT ILLUMINATED ON AFTER START LIGHT WENT OUT ON RESET LEFT SIDE. GROUNDED - YES. CONFIRMED FAULT, L/H PACK-ZONE TEMP CONTROLLER BITE SHOWS TCV 1 (V139) FAIL. R/H PACK-ZONE TEMP CONTROLLER SHOWS NO FAULTS. REMOVED & REPLACED TCV 1 REF B737-900 AMM 21-51-10, LK CK & OPS CK NML REF AMM 21-61-00-700-806-002.