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

S-TEC System 55X Autopilot

The primary resource for installing the is the Installation Service Instruction (SI-22-01) . Note that in the aviation industry, a complete installation typically requires a Supplemental Type Certificate (STC) specific to your aircraft's serial number, which S-TEC provides alongside the official documentation upon purchase. Key Installation Documentation

: Integration with displays like Aspen or Garmin GI 275 often requires specific Analog Converter Units (ACU) or software unlocks. AP-S-TEC-Fifty-Five-X-Manual.pdf - Pacific Flying Club S-tec 55x Installation Manual

  1. Flight Director/Computer Unit: The "brains" of the system, typically mounted in the avionics rack.
  2. Turn Coordinator: The primary attitude sensor (electrically driven).
  3. Servo Motors: Usually two servos (Roll and Pitch).
  4. Control Panel/Annunciators: Mode selector switches and display readouts.

Turn Coordinator:

Provides the primary rate-based input for the roll axis. S-TEC System 55X Autopilot The primary resource for

  1. Mounting the Control Panel: The control panel should be mounted in a convenient location, such as the instrument panel or a console.
  2. Installing the Computer: The computer should be mounted in a secure location, such as a avionics bay or a dedicated compartment.
  3. Installing the Servos: The servos should be mounted to the aircraft's flight control surfaces, ensuring proper alignment and secure attachment.
  4. Connecting the Sensors: The sensors should be connected to the computer, ensuring proper calibration and configuration.
  5. Wiring and Electrical Connections: All electrical connections should be made according to the manufacturer's instructions and aircraft electrical system standards.
  6. System Calibration: The system should be calibrated according to the manufacturer's instructions, including setting gains, configuring modes, and testing system performance.

The S-Tec 55X is a popular autopilot system designed for use in general aviation aircraft. This write-up provides a comprehensive overview of the installation manual for the S-Tec 55X, highlighting key components, installation requirements, and procedures. Flight Director/Computer Unit: The "brains" of the system,

  • An installation manual for such a sophisticated piece of equipment typically includes: