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CFI lesson plans to teach aviation lessons as a Certified Flight Instructor

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MODE C INTRUDER ALERT

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A function of certain air traffic control automated systems designed to alert radar controllers to existing or pending situations between a tracked target (known IFR or VFR aircraft) and an untracked target (unknown IFR or VFR aircraft) that requires immediate attention/action.

Source FAA Pilot/Controller Glossary↗ · checked 2026-08-25

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