# SDR ASAA2013041694503

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 2013
- Submitted: April 18, 2013
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 18,063 hours, 5,650 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102AS
- Part serial: 16D3HR
- Condition: Inoperative
- Location: Flight Deck
- Part time: 22,604 hours, 7,861 cycles
- 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/ASAA2013041694503

## Discrepancy

HEADING SELECT KNOB WILL NOT CHANGE HEADING.  REPLACED DFCS MODE CONTROL PANEL AND TESTS NORMAL IAW MM 22-11-34.  BITE TEST GROUP NR 32 PASS.  DFCS LRU INTERFACE TEST PASS IAW MM 22-11-34.  DFCS LAND VERIFIY TESTS NORMAL IAW MM 22-00-00.  HGS SENSOR TEST FOR FCC/AT NORMAL IAW MMS 34-36-00.  ETOPS GROUND VERIFICATION SUCCESSFUL.

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