# SDR ASAA2017121922972

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 19, 2017
- Submitted: January 2, 2018
- Operation: Air carrier
- Aircraft: [N589AS](https://openairdocs.org/aircraft/N589AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35686
- Aircraft time: 38,732 hours, 11,701 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 10179
- Condition: Faulted
- Location: Rt A/C Pack
- Part time: 38,823 hours, 11,725 cycles
- Stage of operation: DE
- 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/ASAA2017121922972

## Discrepancy

DURING DESCENT, THE RT PACK LIGHT ILLUMINATED ON RECALL, OUT WITH RESET MASTER CAUTION.  ACFT GROUNDED.  ACCOMPLISHED PACK/ZONE TEMP CONT BITE. INTERMITTENT FAULT TCV.  REMOVED AND REPLACED TCV IAW AMM 21-51-10.  BITE CHECK CLEARS TCV PROBLEM NO LIGHTS IN THE COCKPIT.

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