Understanding "Arrivals"
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I'm new to using FSTraffic and trying to understand how arrivals work as they don't seem to be set up on an Airports schedule in the Traffic Control Center like departures are.
For example:
If I go to the TCC and put in the following A380 flight, this flight departs at 0750 from YSSY, it arrives at NZCH each day at 1255, but if I go to the sim around that time to NZCH and setup a departure flight ..say NZCH-NZWN to generate traffic I don't see this flight arrive??
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It had me wondering too since I never saw any aircraft arriving at a departure airport. Then I set up a flight plan between two airports that an AI flight was flying between at the same time. After seeing the flight depart, I slew to the arrival airport and saw it arrive. I suspect that flights to airports not near your flight path just disappear.
Since then, I set up a departure without a flight plan at KMIA and saw one arrival while waiting there. If time before departure for spawning aircraft is set at 90 at the departure airport, it would affect incoming flights since the aircraft are already parked there. I have mine set to 30.
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I have exactly the same question. I've been playing around with settings at iniBuilds EGLL London Heathrow on the new 1.0.5 update. At first, I wasn't getting anywhere near enough traffic. Then I increased the Time Before Departure Value to 180 minutes, and now there is a much more realistic amount of traffic at the gates. It takes about 15 minutes before there's a queue of planes trying to take off, but there's very few planes landing. If you look at the real world arrivals, there should be a plane landing roughly every 90 seconds to 2 minutes at that time of day. When you stand at the threshold you can always see 3-4 planes lined up on approach, but when I look on my VFR map, I see no more 3 planes anywhere in the area that are arriving (looking at the whole of London), and I would say there's maybe one plane landing every 5-10 minutes? Nothing like reality.
Just Flight, can you tell us how arrivals are worked out?
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This is a very good question that does need explaining, do any of the Staff or Testers, eve look at this forum?
What I have seen in the schedules does not make sense either, eg, if no flight plan exists and you create a schedule , with the return flight, it gives the same take off time as the departure flight -
@hunterdouglas said in Understanding "Arrivals":
do any of the Staff or Testers, eve look at this forum?
Occasionally, but not as a rule.
https://community.justflight.com/topic/2/product-supportYour best bet is always to ask a question via the Support system and that will guarantee an answer.
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Hi all,
Just to give a brief overview of how the arrival traffic works in FS Traffic.
One of the more common support tickets we receive is regarding Ai aircraft frequently going around on approach, either due to traffic on the runway, or more commonly, due to traffic not having the correct separation on approach.
The limitation we face is that the MSFS Ai Traffic / ATC system does not apply any form of separation to the arriving traffic. ATC just directs them to start the approach immediately and does not take into account other traffic in the area.
This then leads directly to another issue we face with the default MSFS traffic system which is when an Ai aircraft performs a go-around, there is a sizeable chance that the aircraft will not receive further instructions from ATC to rejoin the approach. If the Ai aircraft does not receive instructions from ATC it will not know where to fly to, so the aircraft will fly back to the last waypoint on its flight plan (which in our case is the destination airport) and will fly over the airport at a very low altitude.
As MSFS doesn't handle this separation, we have to add separation via code and the only way we have found to do this is by controlling the timing and position of the arrival traffic generation.
So the way the arrival traffic currently works is we take all the arrivals in the 1 hour period the player is currently in, and then space those arrivals out equally over that 1 hour period. For example, if you load into an airport at 1020, we process all of the scheduled arrivals between 1000 and 1059 and then generate them in equal time periods for the duration of that hour (so if there are 6 arrivals scheduled in that hour, an arrival aircraft will generate every 10 minutes). With v1.0.5 we also added a hard limit to this arrival traffic of a maximum frequency of 1 arrival every 3 minutes. From our extensive testing, this provides the best balance of arrival separation and quantity.
As we have to apply a fairly significant amount of code to make sure the arrival traffic is generating correctly and with the best seperation, it is not currently possible to add custom flights to the arrival schedules.
We hope that helps clarify the logic behind the arrival system.
To clarify for future reference, the above is all correct using MSFS SU12 and FS Traffic v1.0.5, but this can and likely will change with future sim updates and updates to FS Traffic.
Mark - Just Flight
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