- Difficulty date
- February 5, 2020
- Submitted
- February 8, 2020
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35690
- Aircraft time
- 43,987 hours, 13,410 cycles
- Part
- Valve
- Part number
- 3989085
- Part serial
- 18518
- Condition
- Failed
- Location
- Lt A/C Pack
- Part time
- 26,571 hours, 8,282 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
L/H PACK LIGHT ILL. UPON MASTER CAUTION CHECK. L/H PACK LIGHT EXTINGUISHES UPON RESET. GROUNDED - YES. CONFIRMED FAULT, #1 PACK/ZONE TEMP CONTROLLER BITE TEST REF B737-800 AMM 21-61-00-700-806-002 SHOWS HARD FAIL #1 TCV (V139). REMOVED & REPLACED #1 TCV REF AMM 21-51-10, LK CK & OPS CK NML. PULLED & RESET 3 TOTAL C/BS. AIRCRAFT RELEASED FROM MEL 21-32B, REMOVED FLIGHT CREW PLACARD.