T8 (Radio Reception Centres) Areas and Disengagement Areas in Corrèze

N_AERONAUTIC_RADIOELEC_T8_019

T8 easements are radio easements for the protection of air navigation facilities (airport navigation and landing facilities, national meteorological receiving centres and radio beams).
They are covered by the same texts as easements PT1 and PT2. The attitude of an easement is the spatial field (i.e., the geographical area) within which the easement applies. This space field can be defined either in 2D or in 3D in particular in the specific cases of airport clearance easements, easements to protect radio transmission centres.
The base includes primary clearance zones, secondary clearance zones, special clearance zones and clearance areas. The maximum distance between the limit of a radio centre and the perimeter of the easement areas shall not exceed:
2 000 metres in the case of a secondary clearance zone;
400 metres in the case of a primary clearance zone surrounding an aeronautical safety facility or a radiogoniometric centre;
200 metres in the case of a primary clearance zone surrounding a centre other than those mentioned above;
5,000 metres in the case of a clearance area.
The maximum width of a special clearance zone protecting a radio link between two fixed points counted perpendicularly to the axis of the radio wave path shall not exceed 50 metres on either side of the radio beam ellipid. In practice, the beam is assimilated to a band and the plate will not exceed 50 m on either side of the axis. The maximum width of a clearance area that protects a radio tracking or navigation station shall not exceed the width of the angular area explored by the station, increased, where appropriate, by a safety margin of not more than one degree beyond the two limits of that area.