S-tec 55x Installation Manual Jun 2026

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For automatic pitch trim functionality. 2. Pre-Installation Requirements S-tec 55x Installation Manual

Always refer to the specific, revision-controlled installation manual provided with the specific Supplemental Type Certificate (STC) for your aircraft model.

The S-tec 55x autopilot system is a popular choice among aircraft owners and operators due to its advanced features, reliability, and ease of use. The system is designed to provide precise control of the aircraft's flight control surfaces, allowing pilots to focus on other aspects of flying. However, to realize the full benefits of the S-tec 55x, it must be installed correctly. The system is designed to provide precise control

Installation of the 55X is a major alteration requiring strict adherence to the manufacturer’s Installation Manual (IM). This paper summarizes the critical phases of that manual, highlighting the technical challenges and safety requirements involved in the integration process.

: The central unit that processes pilot commands and sensor data. Turn Coordinator : Acts as the primary rate sensor for the roll axis. which costs approximately $1

You cannot typically purchase the installation manual independently. It is tied to the aircraft's specific serial number through the STC package, which costs approximately $1,595 when bought through an S-TEC dealer.

Connects to the HSI or Directional Gyro (DG) heading error output via a 1X AC or DC sin/cos signal.

Connect the servo output to the flight control system, ensuring proper cable tension and minimal backlash.

The System 55X is a rate-based autopilot. It derives its roll and yaw stabilization data from a modified electric Turn Coordinator. This gyro must be mounted perfectly level relative to the aircraft’s lateral and longitudinal axes. Servos (Pitch, Roll, and Trim)