Airport Engineering
The engine failure case for determining the basic runway length may require

Either a clearway or a stop-way
Only clearway
Either a clearway or a stop-way or both
Only stop way

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Airport Engineering
Effective length of a runway is the distance between

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
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

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