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According to aviation regulation it is mandatory to have an area with a radius of 30 m centered
on the take-off location, clear of any obstacles that are not under the control of the pilot.
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22.2.4
Obstacle clearances for cruise flight
Obstacle clearance for cruise flight requires that no obstacles appear in a zone between the
flight height and 50 m below it.
This zone extends over an area that covers all flight lines, that is the scan area plus ~400 m
extra at each end of the scan lines.
2.0
Safety
Obstacle clearances
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12 October 2012
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