Because the shape and design of a Terminal Airspace depends upon the Terminal routes and holds to be contained within it, and that Terminal routes/holds are based on certain assumptions, it follows that the shape of each Terminal Airspace will be unique
St2 
 St2 

 St2 

Figure 6- 5: No ‘fixed’ shape for Terminal Airspace
Being three dimensional, Terminal Airspace structures have width, length and height/depth with defined lateral and vertical limits. That these limits need not be uniform is a natural result of this Guideline. Indeed, the structure’s lower limits are frequently stepped as may be the case with the upper limit.
Note 1: If tactical vectoring is to be used by ATC, the Terminal Airspace dimensions should ensure that sufficient space if provided for sequencing and separation of traffic.
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.  ST2.1: TO THE EXTENT POSSIBLE, BOTH VERTICAL AND LATERAL DIMENSIONS OF A TERMINAL AIRPACE STRUCTURE SHOULD BE COMPATIBLE WITH AIRCRAFT FLIGHT PROFILES, HAVING TAKEN OBSTACLE CLEARANCE CRITERIA INTO ACCOUNT .

Figure 6- 6: ‘Compatibility’ between Routes & Structure (Simplified)
Whilst the above diagrams suggest that the Terminal Airspace structure is a function only of the aircraft performance, obstacle clearance must be accounted for as well. As such, they illustrate (simplistically) how to arrive at compatibility between the Structure and the routes and holds protected by the structure. The diagrams show how the vertical limits and horizontal limits of the Terminal Airspace may be arrived at with sample climb and descent profiles based on Graph 5-1 from Chapter 5. Significantly, tactical vectoring routes should also be accounted for when deciding the structure’s dimensions. The conclusion that may be drawn from these diagrams is that there is a relationship between the width/height of a Terminal Airspace and aircraft profiles.
In effect, designers creating the Terminal structure would have available several graphs showing an extensive spread of performances. Importantly. the lower limit of the airspace
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must not be lower than a minimum height described by ICAO – excluding the part of the structure that is to serve as a CTR (which by definition, starts at the surface).
For complex airspace structures, see Chapter 7.
Compatibility needs also to be assured as regards non-designated Terminal routes e.g. Radar Vectoring. The Terminal Airspace should allow for sufficient space for Radar Vectoring to occur.
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本文鏈接地址：EUROCONTROL MANUAL FOR AIRSPACE PLANNING 2(54)