# SDR ASAA2023030742246

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2023
- Submitted: March 9, 2023
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 52,758 hours, 15,502 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 16MYND
- Condition: Faulty
- Location: Flight Deck
- Part time: 53,182 hours, 16,727 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023030742246

## Discrepancy

ALTITUDE SELECTOR ON MCP MISSES THE ALTITUDE SELECTION AND ADDS BACK A FEW HUNDRED FEET OCCASIONALLY. GROUNDED - YES. DUPLICATED PROBLEM, R & RD DFCS MODE CONT PNL PER B737-800 AMM 22-11-34.

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