Alternate heliport

urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:Alternate_heliport

A heliport to which a helicopter may proceed when it becomes either impossible or inadvisable to proceed to or to land at the heliport of intended landing. Alternate heliports include the following: Take-off alternate. An alternate heliport at which a helicopter can land should this become necessary shortly after take-off and it is not possible to use the heliport of departure. En-route alternate. A heliport at which a helicopter would be able to land after experiencing an abnormal or emergency condition while en-route. Destination alternate. An alternate heliport to which a helicopter may proceed should it become either impossible or inadvisable to land at the heliport of intended landing.

Source: ICAO