Airport Engineering
For the taxiways, the following statement is true

The maximum longitudinal grade is 3%
All listed here
The permissible rate of change of grade is 1%
The permissible transverse grade is 1.5%

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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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