# SDR ASAA0752188

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2007
- Submitted: November 28, 2007
- Operation: Air carrier
- Aircraft: [N583AS](https://openairdocs.org/aircraft/N583AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35681
- Aircraft time: 967 hours, 329 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Switch
- Part number: 721101A1
- Condition: Faulty
- Location: Autopilot Sys
- Stage of operation: UK
- 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/ASAA0752188

## Discrepancy

THE "A" AUTO PILOT WILL NOT ENGAGE. FFR SHOWS CHANNEL AAP DISCONNECT SWITCH INPUT INVALID.  REPLACED S231 SWITCH IAW 22-11-41.

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