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A very good question indeed. The extension to the London City CTR was originally designed to add a extra 1 nautical mile to the North and South of the existing CTR, and 1.5nm to the East. This was to protect a greater variety of IFR traffic with different performance characteristics, since the original CTR was soley designed for the Dash 7, the only aircraft originally certified to operate into London City Airpiort. On hot days, departing aircraft were going outside CAS on the SIDs, and when vectoring for runway 10 (now 09 by the way),arriving aircraft had to be kept three miles away from traffic on the 10 ILS, which with a 4nm CTR either side of the centreline meant that they were right on the edge of CAS. When the plans for the new expanded CTR were put out to consultation as part of the Airspace Change Proposal, there were various objections from airspace users and other agencies. Therefore the ACP was "watered down" and the CTA was established around the existing CTR. To all intents and purposes the airspace beneath the CTA is more or less sterile, although we do notice some 7000 squawks sneaking under the Eastern edge at 1400ft!
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