Which procedure serves as a backup to ATC communications in the event of malfunction or loss of contact?

Which procedure serves as a backup to ATC communications in the event of malfunction or loss of contact?

• A. Visual hand signals
• B. Radio beacon
• C. Flare signaling
• D. Light gun

Answer: (D)

When radio communications fail, the official way to relay instructions to an aircraft is through a light gun. A ground controller uses a handheld signaling device equipped with a light to transmit standard signals to the aircraft, and the pilot replies with the corresponding light signals or actions. This provides a reliable, visible method for ATC to guide the aircraft when voice contact is unavailable, keeping traffic orderly until radio contact is restored. Visual hand signals are mainly for guiding aircraft on the ground during taxi or parked operations, not for communicating with airborne aircraft. Flare signaling is used for emergency or distress situations and is not the routine backup to ATC communications. A radio beacon is a navigation aid, not a signaling method for ATC instructions.

When radio communications fail, the official way to relay instructions to an aircraft is through a light gun. A ground controller uses a handheld signaling device equipped with a light to transmit standard signals to the aircraft, and the pilot replies with the corresponding light signals or actions. This provides a reliable, visible method for ATC to guide the aircraft when voice contact is unavailable, keeping traffic orderly until radio contact is restored.

Visual hand signals are mainly for guiding aircraft on the ground during taxi or parked operations, not for communicating with airborne aircraft. Flare signaling is used for emergency or distress situations and is not the routine backup to ATC communications. A radio beacon is a navigation aid, not a signaling method for ATC instructions.