The final chapter of the installation manual covers the first flight. This includes verifying: Does the system overshoot or "porpoise"?
The system requires a dedicated, circuit-breaker-protected power source from the avionics bus. Grounding must be established at a central aircraft ground block to prevent ground loops, which introduce electrical noise into the autopilot's audio and navigation signals. Avionics Interfacing
: Use shielded wire for sensitive data lines, grounding the shield only at one end as specified.
The main control head for lateral and vertical modes.
This usually indicates a loss of communication with the primary attitude source (turn coordinator or EFIS). Check the invalid flag lines and the internal 14/28V power inputs. S-tec 55x Installation Manual
Installing an S-TEC System 55X autopilot is a challenging but rewarding project that dramatically enhances an aircraft's IFR capabilities. This article provides a high-level roadmap of the process. However, the installation is not a DIY project. Success depends entirely on meticulous planning, a deep understanding of avionics systems, and strict adherence to the official, airframe-specific STC documentation. Always consult the official and work with a certified avionics shop to ensure a safe, legal, and fully functional installation.
With the autopilot engaged on the ground, the pilot must be able to physically override both the roll and pitch servos using manual control force.
Before engine start, a series of tests must be performed:
Servos interface with the aircraft's primary control cables via bridle cables and clamps. The final chapter of the installation manual covers
The servo output arm must be perfectly aligned with the aircraft’s control linkages to prevent over-centering.
Safety and regulatory considerations
Before inserting the programmer into the panel cradle, use a multimeter at the harness connector pins to verify that power, ground, and navigation voltages match expected values. 2. Servo Direction and Override Testing
Once the mechanical and electrical components are secure, the S-TEC 55X must undergo a rigorous ground setup procedure outlined in the manual's "Post-Installation Calibration" section. Internal Gain Adjustments Grounding must be established at a central aircraft
: Systems typically require a minimum of 8 volts for the autopilot and electric trim outputs. 4. Mounting and Mechanical Setup S-TEC 55X | Genesys Aerosystems | Mineral Wells, TX
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: Detailed pre-flight and in-flight procedures for the System 55X can be found at Pacific Flying Club Arrow Aviation Troubleshooting Guide