Airport Engineering
The size of landing area for multi engine helicopters operating under 1 FR conditions is

22.5 m × 30 m
30 m × 30 m
22.5 m × 22.5 m
60 m × 120 m

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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 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

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