Airport Engineering
The main disadvantage of angle nose out parking configuration of aircraft is that the

Aircraft rear loading door is far away from terminal building
Hot blast is directed towards the terminal building
Overall apron area required is more
All listed here

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Airport Engineering
Castor angle is defined as the angle

Between the horizontal and the fuselage axis
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
Between the true speed of the aircraft and the crosswind component

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