# SDR ASAA2019110431248

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 2019
- Submitted: November 7, 2019
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 45,533 hours, 13,670 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 9521
- Condition: Failed
- Location: Ac Bay
- Part time: 45,198 hours, 14,759 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/ASAA2019110431248

## Discrepancy

RIGHT PACK LIGHT ILLUMINATES DURING MASTER CAUTION RECALL. EXTINGUISHES WITH RESET. GROUNDED - YES. BOX FAULTED R/H TCV RESET BOX AND RAN BITE CHECK (HARD FAULTED.) REMOVED AND REPLACED R/H TCV AND RAN BITE CHECK. NO FAULTS NOTED LEAK CHECK GOOD REF B737-800 AMM 21-51-10.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.