Airport Engineering
The lift off distance is the distance along the centre of the runway between the starting point and

Point where air craft becomes air borne
End of the runway
End of stop-way
Point where air craft attains a height of 10.7 m

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Airport Engineering
Effective length of a runway is the distance between

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