Division (b) As soon as an air traffic services unit becomes aware of an unidentified aircraft in its area, it shall endeavour to establish the identity of the aircraft whenever this is necessary for the provision of air traffic services or required by the appropriate military authorities in accordance with locally agreed procedures. To this end, the air traffic services unit shall take such of the following steps as are appropriate in the circumstances:

attempt to establish two-way communication with the aircraft;

inquire of other air traffic services units within the flight information region about the flight and request their assistance in establishing two-way communication with the aircraft;

inquire of air traffic services units serving the adjacent flight information regions about the flight and request their assistance in establishing two-way communication with the aircraft;

attempt to obtain information from other aircraft in the area;

the air traffic services unit shall, as necessary, inform the appropriate military unit as soon as the identity of the aircraft has been established.