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

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

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Airport Engineering
Castor angle is defined as the angle

Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the horizontal and the fuselage axis
Between the true speed of the aircraft and the crosswind component
Between the direction of wind and the longitudinal axis of the runway

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