![]() Big terminal buildings (or any other building for that matter) can also be an obstacle to visibility, especially on apron areas. This can sometimes prove difficult for runway thresholds if their elevation and distance to the tower location make this angle too low. Under optimal conditions, ATC would need to be able to see all airfield paved areas with a minimum Line of Sight angle which varies from regulator to regulator. It's fairly common where there's more than one runway, and it has a lot to do with visibility from the ATC Tower cab. How common is it an airport decides to built a second tower, and are there a certain rules or limitations before the decision can be made? In short, it is very specific to the local conditions, and they do what they have to in order to properly control the traffic. Once you contact the second controller, they will clear you to continue taxiing. With multiple ground frequencies, if you need to taxi from one controlled area to another, the controller that you are talking to will tell you to hold short of a particular point and contact ground on the other frequency. In this case, there could be only one ground controller, or there may be two or even more, depending on the complexity of the ground operations. For instance, there may be one controller for the North runway and one for the South runway. ![]() At very busy airports they split up the tower/ground controllers/frequencies because one person can only control so many airplanes at a time. For very large airports, they may need towers in different areas of the airport to properly see airplanes at each runway.Īs far as practical consequences it doesn't matter much whether they have one or more towers. Sometimes they have different towers for ground control frequencies and tower control frequencies, and the position of the tower is optimized for the appropriate task. At larger airports it is fairly common to have more than one tower, but it all comes down to how well the tower controllers can see airplanes. ![]()
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