Airport Engineering
The slope of the obstruction clearance line from the boundary of the heliport should be

0.043055555555556
0.069444444444444
0.045138888888889
0.047222222222222

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Airport Engineering
Effective length of a runway is the distance between

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

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