S-tec 55x Installation Manual Hot! Jun 2026

Requires a dedicated, trip-free, resettable circuit breaker (typically 5-amp).

The 55X features built-in GPSS converter logic. Connect the ARINC 429 transmit lines (A and B) from your GPS navigator (e.g., Garmin GTN or GNS series) directly to the designated pins on the 55X harness.

Whether you are an avionics technician, an experimental aircraft builder, or an aircraft owner looking to understand your upcoming shop visit, this guide serves as a comprehensive overview of the requirements, procedures, and best practices. 1. System Overview and Major Components S-tec 55x Installation Manual

: Must be installed by an FAA-certified avionics technician or equivalent authority.

The addition of the programmer/computer, servos, brackets, and bridal cables will alter the aircraft’s empty weight and center of gravity. A new weight and balance calculation must be performed post-installation. Whether you are an avionics technician, an experimental

This paper serves as a technical overview and procedural guide for the installation of the S-TEC System Fifty Five X (55X) autopilot system. As one of the most prevalent General Aviation autopilot systems, the 55X requires precise integration with an aircraft’s existing pitot-static, electrical, and flight control systems. This document outlines the regulatory framework, physical installation considerations, electrical interfacing, and the mandatory post-installation testing protocols required for airworthiness certification.

Control cables, pushrods, and bridle cables must be rigged according to the specific STC drawings to prevent control binding or over-center travel. physical installation considerations

+------------------+ +----------------------+ +--------------------+ | Turn Gyro 6405 |-------> | Programmer/Computer | <-----> | Pressure Sensor | +------------------+ | System 55X | +--------------------+ +----------------------+ | | v v +------------+ +------------+ | Roll Servo | | Pitch Servo| +------------+ +------------+ Power and Grounding