Park Rapids Avionics Products
S-TEC GPSS/Heading Autopilot Selector Switch
This part number designates a panel-mounted cockpit selector switch manufactured by S-TEC Corporation. It serves as the primary user interface switch for the S-TEC ST-901 GPS Roll Steering (GPSS) converter system. The switch is engineered to toggle the autopilot's lateral guidance source back and forth between a traditional directional gyro/HSI heading bug and digital GPS data.
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
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- Lateral Signal Path Toggling: Functions as the hardware master switch routing lateral control data to the flight computer. Pressing the switch instantly swaps control input between the legacy analog heading error line and high-precision digital roll commands.
- GPSS Mode Activation: When armed in the GPSS state, it routes digital ARINC 429 roll-steering data from a compatible GPS straight through the converter system, allowing the autopilot to smoothly track complex flight paths, holds, and procedure turns.
- HDG Mode Reversion: Toggling the button back to the HDG state returns primary tracking authority to the physical instrument panel heading bug, enabling standard manual heading selection.
- Cockpit Space Efficiency: Designed with an ultra-compact footprint that mounts straight into crowded secondary switch panels or instrument bezels without demanding primary avionics stack space
Additional information
| Part Number | 03975 |
|---|---|
| Serial Number | 0603-4489 |
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