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Air Law

ensure that the aircraft uses all available means to send the signals described

in ICAO Doc 9731-AN/958.

Signal to ships

If it becomes necessary to instruct a ship to assist, the following maneuvers can

be performed in the order mentioned:

1. Fly around the ship at least once.

2. Fly at low altitude in front of the ship, across its

course, simultaneously:

a) Open and close the throttle,

or

b) Change the propeller setting.

3. Fly in the direction the ship should be directed.

If you want to inform that assistance is no longer required, you should:

4. Fly at low altitude close behind the ship, across its

wake, while:

a) Opening and closing the throttle,

or

b) Changing the propeller setting.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 100