Airport Engineering
In Instrumental landing system, the middle markers are located

About 1 km. ahead of the runway threshold
Along the extended centre line of runway end
About 7 km. ahead of the runway threshold
At the runway threshold

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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 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

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