SPO.OP.150 Destination alternate aerodromes – aeroplanes

For IFR flights, the pilot-in-command shall specify at least one weather-permissible destination alternate aerodrome in the flight plan, unless:

(a)the available current meteorological information indicates that, for the period from 1 hour before until 1 hour after the estimated time of arrival, or from the actual time of departure to 1 hour after the estimated time of arrival, whichever is the shorter period, the approach and landing may be made under visual meteorological conditions (VMC); or

(b)the place of intended landing is designated as an isolated aerodrome and:

(1)an instrument approach procedure is prescribed for the aerodrome of intended landing; and

(2)available current meteorological information indicates that both following meteorological conditions will exist from 2 hours before to 2 hours after the estimated time of arrival, or from the actual time of departure to 2 hours after the estimated time of arrival whichever is the shorter period:

(i)a cloud base of at least 300 m (1 000 ft) above the minimum associated with the instrument approach procedure;

(ii)visibility of at least 5,5 km or of 4 km more than the minimum associated with the procedure.