Airport Engineering
According to the International Civil Aviation Organization (I.C.A.O.) the strength of runway pavements, have been coded by

Last Seven English alphabets
First seven numbers
Seven English alphabets
First Seven English alphabets

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Airport Engineering
Wing loading of an aircraft is

Gross total weight of the aircraft/ wing area
Gross total weight of the aircraft/total available H.P of engines
Gross total weight of the aircraft/ load of the wings
Load of the wings

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