Usage
Although important for the runway the major use of this number is for the apron. On landing the aircraft is light on fuel and usually less than 5% of the weight of the aircraft touches the runway in one go. On takeoff the aircraft is heavy but as the aircraft accelerates the weight gradually moves from the wheels to the wings. It is while the aircraft is being loaded and taxiing prior to departure, that the apron experiences significant loads from aircraft weight.
Typically this is only used for asphalt or concrete runways and would not be used for grass or gravel.
Read more about this topic: Pavement Classification Number
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