Airport Engineering
To cope up high temperature of 196°C, the taxi ways and aprons are constructed with

Plain concrete
Asphaltic concrete
All listed here
Rubberised tar concrete

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Airport Engineering
Castor angle is defined as the angle

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

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