# SDR ASAA2020021853186

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 2020
- Submitted: February 19, 2020
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 46,678 hours, 13,965 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20993
- Condition: Failed
- Location: Rt A/C Pack
- Part time: 18,364 hours, 5,744 cycles
- Stage of operation: TX
- 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/ASAA2020021853186

## Discrepancy

AFTER PUSHBACK RIGHT PACK LIGHT & ASSOCIATED AIRCON LIGHT ILLUMINATED ON RECALL AFTER ENGINE START. GROUNDED - YES. PERFORMED BITE TEST OF PACK ZONE TEMP CONTROLLER, FLAGGED TCV. REMOVED AND REPLACED RH TCV REF B737-800 AMM 21-51-10. BITE TEST AND PACK FLOW TEMP CONTROLLER TEST GOOD. NO LEAKS NOTED.

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