# SDR ASAA2019110121154

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2019
- Submitted: November 9, 2019
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 36,692 hours, 10,757 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Pressure Switch
- Part number: S271T45217
- Part serial: T01127B
- Condition: Intermittent
- Location: Lt Mlg Ww
- Part time: 55,860 hours, 31,340 cycles
- Stage of operation: AP
- 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/ASAA2019110121154

## Discrepancy

AUTOPILOT A FAILS TO ENGAGE. AUTOPILOT B WORKS NORMALLY. GROUNDED - YES. REMOVED AND REPLACED "A" SYSTEM AILERON AUTOPILOT ACTUATOR PRESSURE SWITCH, INSTALLATION TEST PASSED REF B737-800 AMM 22-11-40.

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