Why are ground hand signals important on an airfield?

• A. They are used only during emergencies.
• B. They replace ATC instructions entirely.
• C. They provide clear, non-verbal communication when radio is unavailable or crowded.
• D. They are decorative markings with no safety function.

Answer: (C)

Ground hand signals provide clear, non-verbal communication when radio transmissions are unavailable or crowded. In a busy airfield, engine noise and radio chatter can make spoken instructions hard to hear, so a trained ground marshal guides aircraft and vehicles with standardized gestures—telling them when to move, how fast to go, when to stop, and which direction to turn. Because the signals are standardized, pilots and ground crew share a common understanding, reducing miscommunication and the risk of collisions. They supplement ATC instructions; they do not replace them, and ATC still retains control and can issue directions as needed. They’re a safety tool used in routine operations and in situations where radio communication is compromised.