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How can a pilot in flight show that a light signal has been understood?

  • A

    Rock the wings (in the daytime).

  • B

    Apply some changes of RPM.

  • C

    Apply some fast pitch changes.

  • D

    Apply some changes of the rudder.

Refer to figures.
Visual ground signals used by Air Traffic Control (ATC) to communicate with aircraft are essential for guiding pilots during taxiing, takeoff, landing, and parking. These signals ensure safety and efficiency, especially when radio communication is impractical. These signals can be steady or flashing lights sent by a light gun, as well as pyrotechnic lights and flares.

ICAO Annex 2
4. SIGNALS FOR AERODROME TRAFFIC
4.1.2 Acknowledgement by an aircraft

a) When in flight:

1) during the hours of daylight:

— by rocking the aircraft’s wings;

Note.— This signal should not be expected on the base and final legs of the approach.

2) during the hours of darkness:

— by flashing on and off twice the aircraft’s landing lights or, if not so equipped, by switching on and off twice its navigation lights.

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