Let’s start with an old hangar-flying puzzle. You’re outbound on the localizer back course. Your HSI course points back to the runway and you’ve got a right needle deflection. Which way do you turn?
HSI Localizer Magic
Key Takeaways:
- The Horizontal Situation Indicator (HSI) simplifies VOR and localizer navigation by integrating course deviation with the heading indicator, providing intuitive, directionally correct guidance and eliminating reverse sensing.
- For VOR navigation, the HSI allows pilots to always steer towards the needle, regardless of whether the course or its reciprocal is selected, by effectively "flipping" the display.
- When using an HSI for localizer navigation, pilots must consistently set the *front course* to ensure the CDI provides correct directional guidance (always steer toward the needle), even when flying the back course.
- While the HSI provides clear visual guidance, autopilots typically require a separate "BC" (back course) mode to correctly interpret and fly localizer back courses.
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