S-tec 55x Installation Manual !!exclusive!!

The S-TEC 55X must be installed by certified avionics shops or FAA-certified mechanics holding the appropriate documentation.

Engage HDG mode, turn the heading bug right, and verify the control yoke turns smoothly to the right without catching or reversing. 6. Flight Testing and Calibration

Engage ALT hold at a level altitude. Check for "porpoising" (vertical oscillations), which usually indicates a loose pitch bridle cable or a static system leak. S-tec 55x Installation Manual

: The S-TEC 55X must be installed under a Supplemental Type Certificate (STC).

| 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 S-TEC 55X must be installed by certified

Protect the system using dedicated, trip-free, resettable circuit breakers. Use separate breakers for Autopilot Power (typically 5A) and Trim Power (typically 5A or 7.5A).

Mount the pressure transducer on a rigid surface to prevent signal "noise." 🧪 Post-Installation Ground Checks Once the hardware is secure, perform these tests: Flight Testing and Calibration Engage ALT hold at

Ensure your kit includes the correct programmer/computer unit, the appropriate roll/pitch servos (typically System 55 models utilize the 0105 or 0106 series servos), mounting brackets, and the specific bridle cable kit for your airframe.

If integrating with glass cockpits (e.g., Garmin GNS 430 or Sandel HSI), refer to the System 55X Troubleshooting Guide for correct ARINC 429 configuration and internal settings. AP-S-TEC-Fifty-Five-X-Manual.pdf - Pacific Flying Club

Once the installation is complete, the system must be tested and calibrated to ensure proper operation. To do this: