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NEW YORK AIRWAYS, INC.
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However, the operational characteristics of the available flight equipment are also a controlling factor. Only vertical landing and take-off performance capability permits the multi-turbine engine helicopter to serve more centrally located and consequently more useful heliport facilities including rooftop pinnacle sites. (Reference Chart 6.)
Heliports must, of course meet certain basic safety criteria including adequacy of take-off and landing areas, approach and departure paths, public protection measures, aircraft traffic control patterns, and similar features, based on the nature of the operation and type of flight equipment available. Factors concerning traffic volume, operational safety and overall economics must also be evaluated in determining the location and development of a heliport. 
These factors, as related to performance and operating characteristics of the flight equipment expected to use the facility will influence the size, configuration and the operational suitability of any particular heliport. For heliports serving single-engine helicopters must be available for landing in the event of power plant failure. The availability of the paths and any other required open areas must be considered.