Canadian Aviation Regulations

303.07 (1) The operator of a designated airport shall determine a critical category for fire fighting for the airport based on the number of movements at the airport during the three-month period determined in accordance with subsection 303.06(3) or (4) by commercial passenger-carrying aircraft in the highest and the next highest aircraft categories for fire fighting.

(2) Where, during the period referred to in subsection (1), the number of movements at the designated airport by aircraft in the highest aircraft category for fire fighting is 700 or more, the critical category for fire fighting is equivalent to that highest aircraft category for fire fighting.

(3) If, during the period referred to in subsection (1), the number of movements at the designated airport by aircraft in the highest aircraft category for fire fighting is less than 700, the critical category for fire fighting shall be determined by decreasing the highest aircraft category for fire fighting by one category.

(4) If the operator of a designated airport anticipates a period of one or more hours of movements of aircraft of a lower aircraft category for fire fighting only, the operator may reduce the critical category for fire fighting to the highest aircraft category for fire fighting anticipated for that period if the operator

• (a) documents the anticipated situation; and

• (b) notifies the appropriate air traffic control unit or flight service station of the reduced critical category for fire fighting for publication in a NOTAM.