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Old 23rd Jul 2021, 11:34
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triadic
 
Join Date: Jan 1999
Location: Abeam Alice Springs
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Why 6000ft upper limit. The E base there is A085. Not sure if the following relates only to "control area" or to both CTA and "Control Zones"? If applicable the upper limit should be either A055 or A065.

Makes one ask why the base of Class A is FL180 and not FL185


ICAO Annex 11 (Chapter 2.11.3 Control areas) states:

2.11.3.3 An upper limit of a control area shall be established when either:
  1. air traffic control service will not be provided above such upper limit; or
  2. the control area is situated below an upper control area, in which case the upper limit shall coincide with the lower limit of the upper control area.
When established, such upper limit shall coincide with a VFR cruising level of the tables in Appendix 3 to Annex 2.
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