# SDR ASAA2021050234713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2021
- Submitted: May 3, 2021
- Operation: Air carrier
- Aircraft: [N597AS](https://openairdocs.org/aircraft/N597AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35689
- Aircraft time: 47,542 hours, 14,281 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 2905
- Condition: Failed
- Location: Lt A/C Bay
- Part time: 63,788 hours, 36,718 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021050234713

## Discrepancy

LH PACK TEMP CONTROL VALVE FAILED. GROUNDED - YES. PACK ZONE TEMPERATURE CONTROL BITE SHOWS LH PACK TCV FAILED. REMOVED TEMPERATURE CONTROL VALVE PER B737-800 AMM 21-51-10-000-801. INSTALLED TCV PER AMM 21-51-10-400-801 PERFORMED GROUND VERIFICATION TEST PER AMM 21-51-10-400-801. PARA F GROUND VERIFICATION TEST PASSED.

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