# SDR ASAA2017081021596

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 10, 2017
- Submitted: August 11, 2017
- Operation: Air carrier
- Aircraft: [N471AS](https://openairdocs.org/aircraft/N471AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41703
- Aircraft time: 11,478 hours, 3,794 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 16GVRM
- Condition: Failed
- Location: Flight Deck
- Part time: 32,923 hours, 12,117 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017081021596

## Discrepancy

HEADING SELECT KNOB INTERMITTENTLY DOES NOT MOVE CURSOR WHEN ROTATED.  ACFT GROUNDED. VERIFIED DEFECT, REMOVED AND REPLACED MCP, IAW AMM 22-11-34. OPS CHECKED NORMAL. ALL LLM TESTS PASSED.

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