Flight director indicator (FDI)

One of the major components of a flight director system, it provides steering commands that the pilot (or the autopilot, if coupled) follows.

Source: Pilot's Handbook of Aeronautical Knowledge (definition from the FAA-H-8083-25B, 2016; current: FAA-H-8083-25C, 2023, with the October 2025 addendum).

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Glossary last updated 2024-07-25.

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