(2)  
for a flight to any other land destination, the duration of the flight and the meteorological conditions prevailing are such that, at the estimated time of arrival at the site of intended landing, an approach and landing is possible under visual meteorological conditions (VMC); or

(3)  
the site of intended landing is isolated and no alternate is available; in this case, a point of no return (PNR) shall be determined.

(c)  
The operator shall select two destination alternate aerodromes when:

(1)  
the appropriate weather reports and/or forecasts for the destination aerodrome indicate that during a period commencing 1 hour before and ending 1 hour after the estimated time of arrival, the weather conditions will be below the applicable planning minima; or

(2)  
no meteorological information is available for the destination aerodrome.

(d)  
The operator may select off-shore destination alternate aerodromes when the following criteria are applied:

(1)  
an off-shore destination alternate aerodrome shall be used only after a PNR. Prior to the PNR, on-shore alternate aerodromes shall be used;

(2)  
OEI landing capability shall be attainable at the alternate aerodrome;

(3)  
to the extent possible, deck availability shall be guaranteed. The dimensions, configuration and obstacle clearance of individual helidecks or other sites shall be assessed in order to establish operational suitability for use as an alternate aerodrome by each helicopter type proposed to be used;

(4)  
weather minima shall be established taking accuracy and reliability of meteorological information into account;

(5)  
the MEL shall contain specific provisions for this type of operation; and

(6)  
an off-shore alternate aerodrome shall only be selected if the operator has established a procedure in the operations manual.

(e)
The operator shall specify any required alternate aerodrome(s) in the operational flight plan.

CAT.OP.MPA.185 Planning minima for IFR flights — aeroplanes
(a)  
Planning minima for a take-off alternate aerodrome

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 1 hour before and ending 1 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.

(b)  
Planning minima for a destination aerodrome other than an isolated destination aerodrome
　
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本文鏈接地址：Annexes to the draft Commission Regulation on ‘Air Operations - OPS’(85)