S-Tec Autopilot Pitch Servo

This part number designates a remote-mounted, high-torque electric autopilot pitch servo assembly manufactured by S-TEC Corporation. It serves as the primary mechanical actuator for automated pitch control, interfacing directly with S-TEC flight control systems (such as the System 55 or 55X) to manage the aircraft's altitude hold, vertical speed, and glide slope tracking functions.
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Description

This unit has been bench tested by an FAA certified repair station and it comes with an 8130 single release dated 06/03/2026.

This configuration is built for a 28 VDC nominal power environment and is commonly factory-installed or STC-integrated on high-performance general aviation aircraft.

Key Technical Capabilities
    • Vertical Flight Path Tracking: Receives electronic elevator-command signals from the primary flight guidance computer to mechanically adjust pitch, ensuring stable capture and retention of preselected altitudes or vertical speed rates.
    • Precision Electromechanical Actuation: Combines a high-efficiency electric motor with internal gear reduction linkages to drive the external pulley mechanism, maintaining continuous structural authority over the elevator control rigging.
    • Internal Slip Clutch Safety: Features an integrated mechanical slip clutch assembly designed to safely yield to manual pilot intervention, allowing the flight crew to instantly overpower the autopilot servo in an emergency without jamming the primary control system.
    • Robust Aluminum Housing: Enclosed in a heavy-duty, corrosion-resistant metallic casing engineered to isolate internal electrical windings, brushes, and feedback circuits from structural vibration and ambient shifts in remote airframe cavities.


Additional information

Part Number

0108-P4

Serial Number

5884A

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