Airport Engineering
The runway length after correcting for elevation and temperature is 2845 m. If the effective gradient on runway is 0.5 percent then the revised runway length will be

2910 m
3130 m
2845 m
3030 m

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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 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

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