Airport Engineering
For the taxiways, the following statement is true

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

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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 horizontal and the fuselage axis
Between the true speed of the aircraft and the crosswind component
Between the direction of wind and the longitudinal axis of the runway

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