Smiths Industries Horizontal Situation Indicator

This is a panel-mounted electromechanical Horizontal Situation Indicator (HSI) manufactured by Smiths Industries. It functions as a primary navigation display console on factory-installed or retrofitted on legacy corporate jets and high-performance turboprops.

Description

This unit has been bench tested by an FAA certified repair station and it comes with an 8130 single release dated 7/21/2026.

Key Technical Capabilities
  • Consolidated Navigation Display: Combines heading data, VOR/Localizer course deviation indicators, and glideslope vertical paths simultaneously onto a single display dial face. This integration simplifies pilot scanning by replacing multiple standalone instruments.
  • Slaved Compass Synchronization: Automatically coordinates with an external remote gyroscopic compass and flux valve array, continuously driving the rotating heading card to maintain real-time directional tracking without manual pilot adjustments.
  • Rectilinear Deviation Tracking: Employs precise, flat-tracking internal needles rather than pendulum-style bars, ensuring the navigation indicators intersect cleanly at right angles for optimized accuracy during precision ILS approaches.
  • Invalid Input Flag Shutter: Built with automated mechanical warning flags that instantly snap into view if incoming compass data or VHF radio signals drop below safe operational tracking thresholds.

Additional information

Part Number

2855-01-1

Serial Number

531

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