# SDR ASAA2023060943509

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 9, 2023
- Submitted: June 12, 2023
- Operation: Air carrier
- Aircraft: [N560AS](https://openairdocs.org/aircraft/N560AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35179
- Aircraft time: 60,793 hours, 18,328 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 10159
- Condition: Failed
- Location: Right Ecs Bay
- Part time: 50,974 hours, 16,028 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023060943509

## Discrepancy

MASTER CAUTION, AIR COND, RT PACK LITE ILLUMINATED ON RECALL PANEL AFTER START CHECKLIST. GROUNDED - YES. HAD RIGHT HAND TEMPERATURE CONTROL VALVE FAIL. IT LOOKS LIKE IT'S BEEN ON AIRCRAFT FOR A VERY LONG TIME. REMOVED AND REPLACED RIGHT HAND TEMPERATURE CONTROL VALVE IAW B737-800 AMM 21-51-10/401.

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