What does the acronym FDI stand for in cockpit instruments?

• A. Flight Director Indicator
• B. Final Descent Indicator
• C. Flight Deviation Index
• D. Flight Data Interface

Answer: (A)

FDI stands for Flight Director Indicator, the guidance cue shown on the primary flight display to show the commanded flight path. The flight director translates navigation inputs and target paths into visual cues for your aircraft, usually as pitch and bank guidance bars. When you fly manually, you use these cues to bring the aircraft to the commanded attitude—pitch toward the horizon to align the pitch bar, and roll toward the center to center the bank bar. When the autopilot is coupled, it will fly to follow those director cues automatically, keeping you on the intended path. This makes the Flight Director Indicator a key aid for both manual and automated flight, guiding you to the desired trajectory. The other terms aren’t standard cockpit indicators for guiding flight paths, which is why they don’t fit as the acronym’s meaning.