# SDR ASAA2017020419659

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2017
- Submitted: February 7, 2017
- Operation: Air carrier
- Aircraft: [N560AS](https://openairdocs.org/aircraft/N560AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35179
- Aircraft time: 40,033 hours, 12,094 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 4082260939
- Part serial: 01727829
- Condition: Failed
- Location: Altitude
- Part time: 57,445 hours, 26,138 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017020419659

## Discrepancy

MCP ALTITUDE SELECTOR READOUT HAS DIGITAL NUMERIC BLEED THROUGH.  ACFT GROUNDED.  REMOVED AND REPLACED DFCS MODE CONTROL PANEL IAW AMM 22-11-34. ALT DEACT REVERSED. TESTS GOOD. PERFORMED DFCS LRU REPLACEMENT TEST FOR MCP TEST GROUP  32 IAW AMM 22-11-34, LAND VERIFY TEST-TEST GROUP 49 IAW AMM 22-11-00 AND HGS SENSOR TEST FOR FCC/AT IAW SMM 34-36-00. ALL TESTS PASS-NO FAULTS . AIRCRAFT REMAINS CAT IIIA AUTOLAND & HGS QUALIFIED. CAT STATUS SCREW REFLECTS SAME.  GROUND VERIFICATION SUCCESSFULL.

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