NCO.OP.143 Destination alternate aerodromes planning minima — aeroplanes

An aerodrome shall not be specified as a destination alternate aerodrome unless the available current meteorological information indicates, 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:

(a)for an alternate aerodrome with an available instrument approach operation with DH less than 250 ft,

(1)a ceiling of at least 200 ft above the decision height (DH) or minimum descent height (MDH) associated with the instrument approach operation; and

(2)a visibility of at least 1 500m; or

(b)for an alternate aerodrome with an instrument approach operation with DH or MDH 250 ft or more,

(1)a ceiling of at least 400 ft above the DH or MDH associated with the instrument approach operation; and

(2)a visibility of at least 3 000m; or

(c)for an alternate aerodrome without an IAP,

(1)a ceiling of at least the higher of 2 000ft and the minimum safe IFR height; and

(2)a visibility of at least 5 000m.