S-tec 55x Installation Manual Now

The S-TEC 55X is an avionics stack-mounted system that provides roll and pitch control.

Place the approved Airplane Flight Manual Supplement into the aircraft's permanent POH (Pilot's Operating Handbook) for pilot reference.

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To return the aircraft to service, the installing FAA-certified A&P mechanic or authorized repair station must document the work. This includes updating the aircraft equipment list, filing an FAA Form 3337 (Major Repair and Alteration), and placing the S-TEC 55X Airplane Flight Manual Supplement (AFMS) into the aircraft cockpit.

Must be filled out detailing the installation compliance with the STC. The S-TEC 55X is an avionics stack-mounted system

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.

Installed in the wings or fuselage to control the ailerons. To return the aircraft to service, the installing

Manufacturers typically require that their products be installed according to their guidelines to honor warranties and provide support.

How cleanly does the autopilot join a localizer or GPS track?

From ensuring proper connector seating in the tray to carefully aligning the analog signals with the aircraft’s PFD, each step is critical to the system's ultimate reliability. By strictly following the official documentation and understanding the system's operational limitations (such as speed and altitude restrictions), owners and technicians can ensure that the S-TEC 55X provides many hours of safe, dependable, and high-performance flight guidance.