The runway use rule for the pattern runway should include both arrivals and departures. (The VFR pattern runway on the flow doesn’t tell us what kinds of planes use the runway, etc.) You must still include a runway use – just having the traffic pattern runway will not make that runway used. Whether it is used for arrivals, departures, or bothįlows also have a “pattern” runway for VFR traffic patterns, but X-Plane ignores the Pattern Runway and Pattern Direction fields on flows because we don’t support VFR traffic patterns yet.Departure frequency for aircraft departing from this runway using this rule.Restrictions that control whether the flow can be used at any given time in the sim (time & wind rules).Įach flow has one or more “runway use” that describes a particular runway with use restrictions.Runway use rules tell which runways will be used.Flow basics & rulesĮach airport in WED can have one or more flows – if no flow is provided, X-Plane just makes one up. So it may make sense to have your last flow have no rules, so it is a “catch-all”. 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.Whether the runway is used for takeoffs, landings, or both.Which runways are used, and in which directions.The “flow” system in WED/X-Plane aim to model real world procedures that were designed for real world efficiency.Īn airport ATC “flow” defines how the runways in an airport are used. Real world ATC is all about efficiency – runway space at major airports is limited, so ATC aims to use the existing runways, taxiways, and airspace in the most efficient manner to arrive and depart as many planes per hour as possible.
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