# SDR ASAA2020110333480

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 3, 2020
- Submitted: November 5, 2020
- Operation: Air carrier
- Aircraft: [N585AS](https://openairdocs.org/aircraft/N585AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35683
- Aircraft time: 48,733 hours, 14,700 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 11284
- Condition: Faulted
- Location: Rt A/C Pack
- Part time: 43,306 hours, 13,199 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/ASAA2020110333480

## Discrepancy

RT PACK LIGHT ILLUMINATES ON RECALL.  GROUNDED-YES.  REPEAT WRITE UP,  PERFORMED BITE CHECK OF NR 2 TEMP CONTROLLER, FOUND "THIS PACK TCV" FAULT LATCHED ON BIT AND LAST FLT, REPEAT FAULT.  REMOVED AND REPLACED RT PACK TCV, REF B737-800 AMM 21-21-10.  OPERATIONS CHECK GOOD.  NO LEAKS OR FAULTS NOTED.

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