S-tec 55x Installation Manual Access

The specific locations where brackets must be riveted or bolted. The required cable tension for the bridle cables. Mechanical Integrity Inspections

The 55X is incredibly versatile and interfaces with both legacy analog gauges and modern digital glass cockpits:

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

The S-TEC 55X features a high-density 50-pin connector on the rear of the programmer unit. Wiring must be executed using high-quality aviation-grade Tefzel wire (typically 22 AWG for signal lines and 18-20 AWG for power and ground lines). Power and Grounding

Cable clamps must be torqued precisely and marked with torque seal to ensure they do not slip over time. 4. Electrical Installation and Wiring Diagrams S-tec 55x Installation Manual

If you need help troubleshooting a specific step in your installation, please let me know: The of the aircraft

The manual mandates the use of MIL-spec shielded wire (typically Tefzel M27500 series) for all signal lines, including navigation inputs, heading error, and servo tachometer feedback. The shields must be grounded only at the aircraft structure end (usually near the control head) to avoid creating ground loops. 5. System Post-Installation Setup and Calibration

Before drilling holes or routing wires, you must understand the physical and electrical architecture of the System 55X. The autopilot relies on a network of modular components working in harmony. The Programmer/Computer (Turn Coordinator)

: Controls the elevator trim tab to relieve control wheel forces automatically. Mechanical Installation and Rigging The specific locations where brackets must be riveted

The S-TEC 55X computer uses a standard ATI radio track or rigid bezel mount.

The S-TEC System 55X is a highly reliable, rate-based autopilot popular in general aviation. Installing it requires strict adherence to the official installation manual to ensure safety and regulatory compliance. This article outlines the critical technical processes, wiring integrations, and calibration procedures detailed in the . Regulatory and Safety Prerequisites

Protect the system using dedicated, trip-free, resettable circuit breakers. Use separate breakers for Autopilot Power (typically 5A) and Trim Power (typically 5A or 7.5A).

Disclaimer: This article is for informational purposes only. Always use the authorized, current-revision installation manual provided by Genesys Aerosystems (S-TEC) for any aircraft modification. The S-TEC 55X features a high-density 50-pin connector

Cut all wires to length per the “Aircraft-Specific Addendum” (usually not in the base manual but provided separately for your tail number). Use Tefzel MIL-W-22759/16 wire. Solder D-sub pins per manual’s crimp specifications (do not use generic automotive crimps).

Verify servo direction, clutch slipping (if applicable), and proper mode switching (HDG, NAV, ALT).

The roll and pitch servos attach to the aircraft’s primary flight control cables using small steel aircraft cables known as bridle cables.

Proper adherence to the manual results in a robust autopilot capable of coupled ILS approaches and smooth GPS navigation. Deviations from the manual regarding the static port or cable rigging typically result in altitude oscillation or sloppy control handling, respectively.

For more information on the S-tec 55x autopilot system, including installation, operation, and maintenance, please refer to the following resources: