S-TEC GPSS / Heading Roll Steering Control Box

This part number designates the remote-mounted processor and computer unit manufactured by S-TEC Corporation. It acts as the primary hardware brain for the S-TEC ST-901 GPS Roll Steering (GPSS) adapter system. It is typically mounted blindly behind the instrument panel or inside the avionics bay. .
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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 4/16/2026.

Key Technical Capabilities
  • Digital-to-Analog Signal Conversion: Translates complex digital roll steering data transmitted by GPS navigators into raw analog heading error signals that legacy flight computers can read and interpret. [1]
  • Waypoint Trajectory Tracking: Enables the autopilot to execute continuous, predictive lateral steering along a flight path defined by waypoints. This eliminates the need for the pilot to constantly twist the heading bug during course changes. 
  • Automated Maneuver Exemption: Feeds advanced path computing directly to the autopilot loop, enabling automated tracking through complex holding patterns, DME arcs, and standard procedure turns without manual user adjustment.
  • Dual Mode Integration: Works dynamically alongside a panel mode toggle switch to alternate system tracking authority back and forth between automated GPS waypoints and traditional manual heading selector lines.

Additional information

Part Number

03976

Serial Number

0604-8738

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