# SDR ASAA2017060821007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2017
- Submitted: June 15, 2017
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41731
- Aircraft time: 18,019 hours, 5,814 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 17YXYK
- Condition: Failed
- Location: Vertical Speed
- Part time: 23,876 hours, 8,662 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/ASAA2017060821007

## Discrepancy

MCP VERTICAL SPEED WINDOW HAS ONE DIGIT SEGMENT PERMANENTLY ILLUMINATED.  ACFT GROUNDED.  REMOVED & REPLACED THE MCP IAW AMM 22-11-34-000-801, & 22-11-34-400-801. OPS CHECKED NORMAL IAW AMM 22-11-34-740-801. MCP TESTS NORMAL, BITE GROUP 32. LAND VERIFY NORMAL.  BITE GROUP 49.

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