The S-TEC System Fifty Five X is a two-axis, digital autopilot system widely used in the retrofit market for general aviation aircraft ranging from single-engine pistons to light twins. Unlike older analog systems, the 55X utilizes a digital computer to process attitude and heading information, offering features such as altitude hold, vertical speed selection, GPS steering (GPSS), and precision approach coupling.
The S-TEC 55X is a high-performance, rate-based digital autopilot known for its reliability and smooth handling. Proper installation is critical for safety and performance. 🛠️ System Overview S-tec 55x Installation Manual
: Maintain physical separation between autopilot wiring and other avionics systems to avoid signal noise. Instrument Interfacing The S-TEC System Fifty Five X is a
The programmer/computer is designed for a standard 6.25-inch radio rack. Position within easy reach of the pilot. Proper installation is critical for safety and performance
Programmer/Computer, Turn Coordinator, and Annunciator.