: Mechanical units (roll and pitch) that drive the control surfaces via linkage or bridle cables. Transducers
How cleanly does the autopilot join a localizer or GPS track?
: Detailed pre-flight and in-flight procedures for the System 55X can be found at Pacific Flying Club Arrow Aviation Troubleshooting Guide
: The main "head" unit (Programmer).
The high-density connector at the back of the programmer unit manages power distribution, sensor inputs, and servo outputs: Pin Category Primary Functions Wiring Specification Main DC Power input, Chassis Ground, Servo Power Turn Coordinator Rate gyro power input, left/right analog error signal 22 AWG Shielded Pair Servo Drive Pitch and Roll motor drive outputs, clutch engagement Alerts / Audio Autopilot disconnect tone generator output to audio panel 22 AWG Shielded 4. Avionics Interfacing and Integration
If your installation includes automatic pitch trim, the trim servo must be integrated into the existing manual trim cable system, requiring precise cable tensioning using a tensiometer according to the airframe manual specs. 3. Electrical Wiring and Interfacing
Ensure at least 1 inch of clearance behind the unit for wire harness routing. 2. Servo Installation The servos are the muscles of the system.
An installation manual for the contains critical technical data, wiring specifications, and certification requirements. 📋 Installation Prerequisites
Verify the yoke-mounted disconnect button kills power to the servos immediately. 🛩️ Flight Calibration
The final step of the installation manual is the tracking and performance flight test. In-Flight Calibration
: A standard installation includes the Programmer/Computer, Turn Coordinator, Pitch and Roll Servos, and Pressure Transducer. 3. Wiring and Pinout Configuration Wiring must comply with FAA AC 43.13-1B/2B standards. Wire Gauge
Servos interface with the aircraft's primary control cables via bridle cables and clamps.
Before beginning the installation, ensure that:
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: Provides troubleshooting, functional ground tests, and system interconnect drawings for rate-based autopilots, including the 55X. S-TEC 55X Maintenance Manual
A key part of the initial setup is ensuring the autopilot is correctly configured to interface with the aircraft's heading system, typically as a KCS-55-compatible unit for DC heading systems. After confirming this in the configuration, an inflight checkout in smooth air is necessary. The technician will engage the autopilot in HDG and ALT modes, then use the PFD’s system setup mode to access the calibration page. From there, they can select "Perform A/P Cal" and then "Sync HDG" to align the autopilot's heading reference with the PFD’s heading bug.
The S-TEC 55X is a rate-based, fully integrated flight control system. Unlike position-based autopilots that rely primarily on attitude indicators, a rate-based system derives its roll information from a turn coordinator. This makes the system highly reliable, as it remains operational even in the event of a vacuum system or primary attitude indicator failure.
: This system is rate-based and requires a compatible S-TEC turn coordinator to function as the primary sensor. 🛠️ Component Overview The typical installation includes:
If the ailerons turn right when you command a left turn, the servo polarity or the mechanical linkage orientation is reversed. Refer to the specific STC manual drawing for correct pinouts.
Once the mechanical and electrical installations are complete, you must perform a comprehensive ground test before taking the aircraft to the skies.