Runway Incursion Or Obstructed Aircraft Air Traffic Control

In the event AERODROME CONTROL TOWER, after a take-off clearance or a landing clearance has been issued, becomes aware of a runway incursion or the imminent occurrence thereof, or the existence of any obstruction on or in close proximity to the runway likely to impair the safety of an aircraft taking off or landing, appropriate action shall be taken as follows:

a) cancel the take-off clearance for a departing aircraft if the aircraft  has not yet commenced take-off roll using phraseology : [C/S] HOLD POSITION, CANCEL TAKE-OFF I SAY AGAIN CANCEL TAKE-OFF [reason];

b) cancel the take-off clearance for a departing aircraft if the aircraft has commenced take-off roll using phraseology : [C/S] STOP IMMEDIATELY [(repeat aircraft call sign) STOP IMMEDIATELY];

c) instruct a landing aircraft to execute a go-around or missed approach using phraseology : [C/S] GO AROUND (reason) ;

d) in all cases inform the aircraft of the runway incursion or obstruction and its location in relation to the runway.

Note.— Animals and flocks of birds may constitute an obstruction with regard to runway operations. In addition, an aborted take-off or a go- around executed after touchdown may expose the aero plane to the risk of overrunning the runway. Moreover, a low altitude missed approach may expose the aero plane to the risk of a tail strike.

Following any occurrence involving an obstruction on the runway or a runway incursion, pilots and controllers shall complete an air traffic incident report in accordance with the ICAO model Runway Incursion Initial Report Form (see attachment 31 on page 331).