S-tec 55x Installation Manual -

| Pin | Signal | Function | Wire Gauge | |------|----------------------|-----------------------------------|-------------| | 1 | GND (Power) | Chassis ground | 18 AWG | | 3 | +14V or +28V | Aircraft power (through CB) | 18 AWG | | 12 | NAV/GPS Valid | Input from GPS (active high) | 22 AWG | | 14 | Heading Bug CW | Potentiometer wiper | 22 AWG shielded | | 27 | Pitch Servo CW | Motor drive output | 20 AWG | | 38 | Yaw Rate (Gyro) | Analog voltage (1.5V +/- 0.2V at level) | 22 AWG shielded |

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 S-tec 55x Installation Manual

Once installed, the system must undergo specific bench and flight line tests: S-TEC 55x installation guide (wiring) - BeechTalk.com | Pin | Signal | Function | Wire

Since the system taps into the pitot-static lines for altitude data, a leak test is mandatory per FAA regulations. 6. Flight Testing GPSS Steering (Global Positioning System Steering)

The 55X features built-in GPSS, which allows it to follow complex flight plans from a GPS. Correct wiring of the data lines is vital for this high-end feature to work. 5. Post-Installation Calibration and Ground Checks