# SDR ASAA2016061116998

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2016
- Submitted: June 13, 2016
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 3,705 hours, 1,212 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Light
- Condition: Inoperative
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016061116998

## Discrepancy

HDG SELECT, SWITCH LIGHTS OUT, MODE DOES SELECT AND SHOW ON THE FMA.  ACFT GROUNDED.  UNABLE TO DUPLICATE DEFECT, HDG SELECT SWITCH LIGHT OPS NORMAL WITH LIGHTS SWITCH IN TEST AND DFCS BITE, REF AMM 22-11-00.

---
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.