# SDR ASAA2020051132713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 8, 2020
- Submitted: May 11, 2020
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 18,985 hours, 6,114 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Condition: Malfunctioned
- Location: Autopilot Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020051132713

## Discrepancy

DURING CRUISE "B" AUTOFLIGHT DISENGAGED, ,WERE SMOOTH AIR. GROUNDED - YES. MCP DATA FAIL, FMC FAIL - LOGGED FAULTS. ACCOMPLISHED MCP EXTENDED MAINTENANCE TEST - NO FAULTS. LAND VERIFY CHECK OK, REF B737-900 AMM 22-11-00 BITE GROUP 49. FMC BITE OK REF AMM 34-61-00.

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