An ATZ is established around each aerodrome notified for the purposes of Rule 45 of the UK Rules of the Air Regulations during the times notified (see 19). Rule 45 states that an aircraft shall not fly, take-off or land within the ATZ of an aerodrome unless the commander of that aircraft has obtained the permission of the air traffic control unit at the aerodrome or – where there is no air traffic control unit – has obtained from the aerodrome flight information unit at the aerodrome, information to enable the flight within the zone to be conducted with safety or – where there is no air traffic control unit nor aerodrome flight information service unit – has obtained information from the air/ground radio station at that aerodrome to enable the flight to be conducted with safety.
Pilots wishing to enter an ATZ must comply with the published requirements for that particular aerodrome and in the case of an aerodrome with an Air Traffic Control Unit, with any instructions issued by that unit. ATZs are not included in the Airspace Classification System. An ATZ conforms to the Class of Airspace in which it is situated thus, for example, in Class G Airspace Rule 45 will apply but in Class D Airspace the requirements of Class D will apply in addition (UK AIP section ENR 1.4 refers).
An ATZ is defined in relation to an aerodrome where:
(a) the length of the longest runway is notified as 1850 metres or less, the airspace extending from the surface to a height of 2000ft above the level of the aerodrome within the area bounded by a circle centred on the notified mid-point of the longest runway and having a radius of 2nm. Where such an ATZ would extend less than 1.5nm beyond the end of any usable runway at the aerodrome the radius of the circle may be extended to 2.5nm;
(b) the length of the runway is notified as greater than 1850 metres, the airspace extending from the surface to a height of 2000ft above the level of the aerodrome within the area bounded by a circle centred on the notified mid-point of the longest runway and having a radius of 2.5nm.
An ATZ at a civil aerodrome does not exist outside the notified hours of operation of the A/G, AFISO or ATC Unit. At a Government aerodrome, an ATZ will remain active during such times as are notified, regardless of the operational status of its ATS unit (UK AIP section ENR 2.2 and, where appropriate, certain section AD 2 items 2.17 refer). However, pilots are reminded that flying may take place outside of the published aerodrome operating hours and should therefore exercise caution when flying in the vicinity. Reference to specific ATZ’s can be found in the ENR section 2-2-2-1/5 of the AIP.
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本文链接地址：Guide to Visual Flight Rules (VFR) in the UK(8)
