![]() It is important that for any conditions at least one flow be selected given bad enough weather conditions in real life the airport might be shut down, but in X-Plane the airport must remain open. In our KBOS example, you would want to arrange the flows in WED in the order they’re listed above (ordered by high to low efficiency). It will be picked the majority of the time and will only be bypassed if it absolutely cannot be used. This means flows should be arranged in WED so that the ideal, most-used flow is first. ![]() The first flow in which all of its rules “pass” is selected.X-Plane will evaluate each of your flows in the order they appear in WED – the top flow in the hierarchy is evaluated first.Only one flow may be running at a time.The main rules for flow selection in X-Plane are: Flows in WED & X-Plane Selection Rules and Priority By comparison the northeast flow provides the highest operations rate, with jets landing parallel to props (with each stream of aircraft packed tightly) and room for completely independent departures on runway 9. It is also hard for ATC to land a prop behind a jet because of wake turbulence rules and the difference in speeds. The southeast flow is a huge bottleneck because KBOS can’t land on runways 9 or 14 all planes have to land on one runway. These flows are ordered from most efficient to least efficient for the airport. The airport also has a noise restrictions: no aircraft ever land on runway 14 or depart on runway 32.īased on this, KBOS has four possible main flows: A detailed example: KBOSīoston Logan has five runways that it uses for major operations: two parallel runways (4L/4R), two near-parallel runways (33L and 32) and one additional runway (9). While X-Plane doesn’t move as many airplanes as KORD, we support the same kinds of rules for realistic routings and flow. Only one “flow” is used at an airport at a single time – each flow is designed so that all of the runways used in the flow can be used at the same time safely to have maximum efficiency at the airport. They are also sometimes based on noise abatement – the route the aircraft flies may be restricted to not fly over residential areas at low altitude and high power. In the same manner, WED’s flows are named for reference and log output only and are never displayed to X-Plane users.įlows are picked based on wind and weather conditions so aircraft can land and take off into the wind. “east flow” and “west flow” but these names are never exposed to pilots. Real world flows are often named after the direction of traffic, e.g. What kinds of planes use which runways. ![]()
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