Airport Engineering
According to I.C.A.O. the recommended length of air ports is decided on

Standard sea level temperature (15°C)
Sea level elevation
Effective gradient percentage
All listed here

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Airport Engineering
In instrument landing system

L.O.M. and Localizer are installed on one side and L.M.M. on the other side
L.O.M. and L.M.M. are installed on one side and Localizer antenna on the other side
Localizer and L.M.M. are installed on one side and L.O.M. on the other side
None of these

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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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