GM1 SECTION I — (c) CONTROL ZONES

GENERAL

(a)If a control zone is located outside of the horizontal limits of a control area, an upper limit should be established.

(b)An upper limit higher than the lower limit of the overlying control area may be established when desired.

(c)If it is desired to establish the upper limit of a control zone at a level higher than the lower limit of the control area established above it, or if the control zone is located outside of the lateral limits of a control area, its upper limit should be established at a level which can easily be identified by pilots. When this limit is above 900 m (3 000 ft) MSL, it should coincide with a VFR cruising level as specified in the tables in Appendix 3 to Commission Implementing Regulation (EU) No 923/2012.

(d)The selected VFR cruising level of the upper limit of a control zone should be such that the expected local atmospheric pressure variations do not result in a lowering of this limit to a height of less than 200 m (700 ft) above ground or water.

(e)A control zone may include two or more aerodromes situated close together.

(f)When designing the lateral limits of control zones, aircraft holding in the vicinity of aerodromes are considered as arriving aircraft.