# SDR ASAA2023110446018

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 2023
- Submitted: November 7, 2023
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 55,298 hours, 16,814 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- 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/ASAA2023110446018

## Discrepancy

AUTO PILOT A WILL NOT ENGAGE. AUTO PILOT B WILL ENGAGE FOR 8 SECONDS THEN DISENGAGE. NO OTHER LIGHTS/MESSAGES OR WARNINGS. GROUNDED - YES. REF FIM 22-11/856 FOUND FAULT AIL ACT PRESS LCL INV INV ON LAST LEG MAINT. MESSAGE 22-11147. PREFORMED DFCS BITE IINTERACTIVE TESTS THROUGH MCP COMD/CWS INTERLOCK. ALL TESTS PASS NO CURRENT FAULTS.

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