Airport Engineering
Effective length of a runway is the distance between

Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway
Ends of the runway
Ends of the clear way on either side
Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway

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Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways and navigational aids available
Lateral spacing between two runways, weather conditions and navigational aids available.
Lateral spacing between two runways and weather conditions
Weather conditions and navigational aids available

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Airport Engineering
In instrument landing system

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

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