# SDR K11A2025120300361

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 2, 2025
- Submitted: January 9, 2026
- Operation: Air carrier
- Aircraft: [N403CK](https://openairdocs.org/aircraft/N403CK), registered now
- Make and model: Boeing 737-4Q8
- Registry model: [Boeing 737-4Q8](https://openairdocs.org/model/boeing-737-4q8) (OpenAirDocs)
- Aircraft serial: 26280
- Aircraft time: 60,670 hours, 37,057 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Control Panel
- Part number: 4051601937
- Part serial: 93052134
- Condition: Failed
- Location: Zone 100
- Stage of operation: CR
- How discovered: V
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K11A2025120300361

## Discrepancy

MODE CONTROL PANEL FROZE IN FLIGHT, WITHOUT THE ABILITY TO CHANGE ANY MODE (COURSE) ALT, HLD, SPEED, N1, HDG SEL, LNAV, VNAV, FD MASTER SIDE. AUTO THROTTLE CONTINUED TO WORK. AUTO PILOT A OR B WOULD NOT ENGAGE. AFTER GROUND IDLING FOR 1.7 HR SUSPECT SMOKE IN COCKPIT, NOTIFIED ATC SHUT DOWN A/C AND EVACUATED A/C NO FIRE FOUND. R & R MCP IAW AMM 22-11-34, DFCS OPS CHECK PASS IAW AMM 22-11-01 NO DEFECTS NOTED, CLEANED EVIDENCE OF GLYCOL FROM LH RAM AIR DUCT IAW AMM 20-30-83 REMOVED SMOKE FROM AIR CONDITIONING SYS IAW AMM 21-00-00 OPS CHECK AIR CONDITIONING SYSTEM PASSED IAW AMM 21-00-00 NO DEFECTS NOTED

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