Airport Engineering
Runway threshold is indicated by a series of parallel lines starting from a distance of

6 m from runway end
3 m from runway end
10 m from runway end
15 m from runway end

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Airport Engineering
Castor angle is defined as the angle

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

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