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Horizontal Situation Indicator (HSI)

The horizontal situation indicator (commonly called the HSI) is an aircraft flight instrument normally mounted below the artificial horizon in place of a conventional heading indicator.

It combines a heading indicator with a VHF omnidirectional range-instrument landing system (VOR-ILS) display.

This reduces pilot workload by lessening the number of elements in the pilot's instrument scan to the six basic flight instruments.

File:HSI 1.png

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