# SDR ASAA2019061069603

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2019
- Submitted: June 10, 2019
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 15,653 hours, 5,084 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 1931
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 81,976 hours, 40,216 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019061069603

## Discrepancy

NR 1 PACK LIGHT ON RECALL. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 801/830. PTC #1 BITE SHOWS 'THIS PACK TCV' FAULT. REQUIRES V139 LEFT TCV. REMOVED & REPLACED V139 LEFT TCV PER B737-900 AMM 21-15-10 PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST PER AMM 21-61-00 NO FAULTS NOTED.

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