Airport Engineering
The threshold markings are

1 m clear space between adjacent
4 m wide
All listed here
Placed symmetrically on either side of the runway centre line

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Airport Engineering
Castor angle is defined as the angle

Between the horizontal and the fuselage axis
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 direction of wind and the longitudinal axis of the runway

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