# SDR ASAA2016102818497

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2016
- Submitted: October 31, 2016
- Operation: Air carrier
- Aircraft: [N409AS](https://openairdocs.org/aircraft/N409AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41733
- Aircraft time: 15,054 hours, 4,894 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 18763
- Condition: Failed
- Location: Cabin Temp
- Part time: 15,067 hours, 4,902 cycles
- Stage of operation: CL
- 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/ASAA2016102818497

## Discrepancy

RIGHT PACK LIGHT ILLUM ON CLIMB, WOULD NOT RESET.  ACFT GROUNDED. REMOVED AND REPLACED S939 RIGHT ACM OVERHEAT THERMAL SWITCH, IAW AMM 21-51-40, S5 RIGHT COMPRESSOR DISCHARGE OVERHEAT SWITCH, IAW AMM 21-51-41, S935 PACK DISCHARGE OVERHEAT SWITCH, IAW AMM 21-51-42. REMOVED AND REPLACED M1455 AIR CONDITIONING ACCESSORY UNIT, IAW AMM 21-51-02. OPS CHECK NORMAL. RT PACK/ZONE TEMP CONTROLLER FAULTS TCV DURING BITE. ACCOMPLISHED TEST MULTIPLE TIMES, FAULT REMAINS. REMOVED AND REPLACED RIGHT PACK TCV, IAW AMM 21-51-10. OPS CHECK NORMAL. RAN RIGHT PACK, NO PACK LIGHT.

---
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.