Easements instituted under Articles L. 6351-1 1° and L. 6351-2 to L. 6351-5 of the Transport Code (formerly R. 241-1 to R. 242-3 of the Civil Aviation Code).
These are easements, known as aeronautical clearing services, created to ensure the safe operation of aircraft, excluding radio easements. They are defined as:
— by a plan of aeronautical alternate easements (PSA) drawn up for each aerodrome referred to in Article L.6350-1 (1) and (2) of the Transport Code (formerly R. 241-2 of the Civil Aviation Code),
— or by provisional safeguard measures which may be implemented in the event of an emergency, before being included in an approved SAAP.
These aeronautical clearance easements shall include:
— the prohibition of creating or the obligation to modify or even remove obstacles which may constitute a danger to air traffic or which are harmful to the operation of safety devices (blow, radio or meteorological) established in the interest of air navigation,
— the prohibition on carrying out works on vessels and other works affected by aeronautical easement
major repairs or improvements exempted from building permits without permission from the administrative authority.
The attitude consists of a three-dimensional surface whose altitude in relation to the ground varies according to the distance with the infrastructure and visual aids. The representation on a plane is done by projection of this form. Polylines with regular spacing indicate an altitude that obstacles can reach without causing danger or genes.
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