# SDR ASAA1159822

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 12, 2011
- Submitted: June 14, 2011
- Operation: Air carrier
- Aircraft: [N569AS](https://openairdocs.org/aircraft/N569AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35184
- Aircraft time: 16,203 hours, 5,282 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 4082260939ASA
- Part serial: 99061789
- Condition: Defective
- Location: Cockpit
- Part time: 37,826 hours, 17,546 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA1159822

## Discrepancy

AUTOPILOT A DISENGAGED TWICE WITHOUT COMMAND.  FIRST TIME AT CRUISE FL380 M.80 SECOND TIME IN V/S DESCENT FL350 M.79.  DFCS LOGGED NUMEROUS MCP DATA INV FAULTS NR 22 11607 ON CH: A&B REF FIM:22 11/817 & 801 FAULT ACTIVE.  REPLACED MCP REF MM:22 11 34 OPS CHECK NML.  ACCOMP DFCS LAND VERIFY NR 49 CK DFCS LRU MCP NR 32 CK & HGS SENSOR FCC/AT TEST ALL CHECK NML REF MM:22 11 00 22 11 34 & SMM:34 36 00.

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