# SDR ASAA2018071925463

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2018
- Submitted: July 20, 2018
- Operation: Air carrier
- Aircraft: [N409AS](https://openairdocs.org/aircraft/N409AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41733
- Aircraft time: 22,159 hours, 7,337 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20140
- Condition: Failed
- Location: Ac Bay
- Part time: 16,276 hours, 5,657 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/ASAA2018071925463

## Discrepancy

RIGHT PACK LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. REF SSM 21-51-22. ACCOMPLISHED PACK TEMPERATURE CONTROL - BITE PROCEDURE, FIM 21-62 TASK 801. THIS PACK TCV ILLUMINATED. REF FIM 21-62 TASK 831. REQUIRES TCV (V141). REMOVED AND REPLACED RT TCV REF B737-900 AMM 21-51-10 OPS CHECK AND LEAK CHECK GOOD.

---
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.