S-tec 55x Installation Manual !!better!! May 2026

The System 55X is a complete flight control system. It integrates with your aircraft’s existing avionics to provide: and Vertical Speed control. Heading Preselect (when paired with a compatible HSI). GPSS Steering (Global Positioning System Steering). Glideslope Capture and tracking. 📋 Pre-Installation Checklist

Verify your specific aircraft tail number is on the Approved Model List (AML).

The programmer/computer is designed for a standard 6.25-inch radio rack. Position within easy reach of the pilot. S-tec 55x Installation Manual

Check for the programmer/computer, pitch and roll servos, and pressure transducer.

Perform a standard pitot-static leak test after plumbing the transducer. The System 55X is a complete flight control system

Keep high-current wires away from the magnetic compass or AHRS units. 4. Pitot-Static Integration

Final tuning must be done in the air. This involves setting the levels to ensure the aircraft doesn't "hunt" (oscillate) during altitude hold or navigation tracking. GPSS Steering (Global Positioning System Steering)

Confirm you can manually overpower the servos with reasonable force.

The System 55X requires a connection to the aircraft’s static system for altitude functions.

Verify the yoke-mounted disconnect button kills power to the servos immediately. 🛩️ Flight Calibration