# SDR ASAA2022011937227

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2022
- Submitted: January 25, 2022
- Operation: Air carrier
- Aircraft: [N913AK](https://openairdocs.org/aircraft/N913AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44079
- Aircraft time: 2,596 hours, 942 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567104
- Part serial: 4FKL1M
- Condition: Inoperative
- Location: Flight Compartme
- Part time: 2,625 hours, 954 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022011937227

## Discrepancy

LNAV BUTTON ON MCP DOES NOT ILLUMINATE FULLY. GROUNDED - YES. REPLACED DFCS MODE CONTROL PANEL PER B737-9 AMM 22-11-34 PG# 401. PERFORMED LLM MCP LRU REPLACEMENT TEST AND LAND VERIFY TEST, BOTH TESTS PASSED. ETOPS GROUND VERIFICATION SUCCESSFUL.

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