The operator shall only select an aerodrome as a take-off alternate aerodrome when the appropriate weather reports and/or forecasts indicate that, during a period commencing one hour before and ending one hour after the estimated time of arrival at the aerodrome, the weather conditions will be at or above the applicable landing minima specified in accordance with CAT.OP.MPA.110. The ceiling shall be taken into account when the only approach operations available are non-precision approaches (NPA) and/or circling operations. Any limitation related to OEI operations shall be taken into account.
The operator shall only select the destination aerodrome when:
the appropriate weather reports and/or forecasts indicate that, during a period commencing one hour before and ending one hour after the estimated time of arrival at the aerodrome, the weather conditions will be at or above the applicable planning minima as follows:
RVR/visibility (VIS) specified in accordance with CAT.OP.MPA.110; and
for an NPA or a circling operation, the ceiling at or above MDH;
or
two destination alternate aerodromes are selected.
The operator shall only select an aerodrome for one of these purposes when the appropriate weather reports and/or forecasts indicate that, during a period commencing one hour before and ending one hour after the estimated time of arrival at the aerodrome, the weather conditions will be at or above the planning minima in Table 1.
Planning minima
Destination alternate aerodrome, isolated destination aerodrome, fuel ERA and ERA aerodrome
| Type of approach | Planning minima |
|---|---|
| CAT II and III | CAT I RVR |
| CATI | NPA RVR/VIS Ceiling shall be at or above MDH |
| NPA | NPA RVR/VIS + 1 000 m Ceiling shall be at or above MDH + 200 ft |
| Circling | Circling |