# SDR ASAA2020020332050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2020
- Submitted: February 4, 2020
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 44,761 hours, 13,457 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 26024
- Condition: Faulted
- Location: Lt A/C Pack
- Part time: 15,453 hours, 4,811 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/ASAA2020020332050

## Discrepancy

CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES ON MASTER RECALL. GROUNDED - YES. PERFORMED PACK TEMP CONTROL BITE ON PZTC #1 AND PZTC #2 REF B737-800 FIM 21-62 TASK 801. FOUND FAULT FOR FLT DECK TRIM VALVE ON PZTC #2. REMOVED AND REPLACED FLT DECK TRIM AIR VALVE REF B737-800 AMM 21-61-21/401. OPS AND LEAK TEST GOOD. ETOPS GROUND VERIFICATION SUCCESSFUL.

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