2. Choosing an airport site
Numerous factors play a part in the choice of a new site or the development of an existing one: runway orientation, length, near and far clearances, integration into air traffic, maximum capacity of the airport platform, etc.
2.1 Track orientation and regularity
Aircraft take-offs and landings become difficult, even dangerous, when the wind component on the ground perpendicular to the runway axis (crosswind) exceeds a critical value which is characteristic of the aircraft and depends mainly on its approach speed.
According to the aerodrome code (cf. § 3.3 article ), the permissible crosswind limit is :
code 1: 5 m/s (10 knots) ;
code 2: 7 m/s (14 knots) ;
code 3: 10 m/s (20 knots) ;
code 4: 13 m/s (26 knots).
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Choosing an airport site
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