# SDR ASAA2020010331743

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 30, 2019
- Submitted: January 8, 2020
- Operation: Air carrier
- Aircraft: [N461AS](https://openairdocs.org/aircraft/N461AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36363
- Aircraft time: 22,805 hours, 7,333 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3986085
- Condition: Intermittent
- Location: Rt A/C Pack
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020010331743

## Discrepancy

RIGHT PACK LIGHT ILLUMINATES DURING RECALL AND EXTINGUISHES WHEN PRESSING MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST. FOUND FAULT TCV#2. REMOVED AND REPLACED #2 TEMP CONTROL VALVE REF B737-900 AMM 21-51-10. BITE TEST GOOD RAN PACKS LIGHT STAYED EXTINGUISHED.

---
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.