Bug: Alternate airfield when airfield is closed
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Version
4.34.2 (x64)Detailed Description
Testing bad weather operations in Balkans (Aviano), I ran into a bug where the homebase steerpoint shifted to the alternate base (Rivolto).
Created another TE in KTO to confirm vanilla behaviour. Took off from Kunsan (75X), with Seosan (52X) as alternate. No mods installed, other than add-on theaters.2 situations:
- Request approach straight after departure (e.g. in case of simulated or actual emergency situation): ATC will tell you the base you just departed from is closed, but will then suggest the closed airbase as alternate.
- Coming from outside 30NM (normal situation after mission), when you request any kind of approach, ATC will inform you that the base is closed, and will correctly give you the data for the actual planned alternate airbase. In doing so, the steerpoint shifts to the alternate airbase’s location automatically. (theoretisizing this is done for AI reasons?)
Pictures
Video starts with situation 1. Not shown in the video is me reporting airborne before asking any kind of approach, which I’ve tested separately. This does not change the end result, however, so is assumedly no factor.
Second situation, at 0:30, steerpoint automatically shifts to the alternate base, as seen by the tadpole and steerpoint line, but diamond steerpoint will reset to homebase, creating system Delta. (not shown in video, but CZ is completely ineffective, making the Delta unresolvable)
I’m assuming it always does this, but in the first situation, it isn’t noticeable, because it stays the same base.Example files
IMC Test flight from Kunsan, KTO, created with 4.34.2. No use of any 3rd party tools.
Reproducibility Procedure
1. Create extremely bad weather to shut down airfield operations
2. Request any kind of approach to get sent to the alternate fieldExpected Behavior
1. ATC should always give you the actual alternate, not the same base you’re already trying to approach.
2. Homebase steerpoint should not relocate to the alternate in your DTC flight plan. -
In regard of 2) I recall that already in previous versions asking for alternate caused the steerpoint for alternate (the one after steerpoint for landing) to jump to the new given alternate.
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Eagle-Eye, Good bug report!
But what are weather conditions in your mission? … are you sure that minimums are compatible with published approaches on the considered runway?
Have you tried in better weather conditions?Please give the ATIS info and weather parameters.
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Eagle-Eye, Good bug report!
But what are weather conditions in your mission? … are you sure that minimums are compatible with published approaches on the considered runway?
Have you tried in better weather conditions?Please give the ATIS info and weather parameters.
Not in this KTO-test. As I really wanted to make sure that the base was closed, I set the weather as bad as it can get:
Inclement weather, overcast TCu clouds at 200ft, visibility 0.6km.Aviano weather was slightly better, with inclement weather, visibility 1.2km, overcast clouds at 600ft, which should’ve been above the ILS minima (800m visibility, DA 570ft). I still got diverted, though. No idea why. May be a bug with weather close to the minima, but more likely is the weather map shifted and put Aviano in below-minimum conditions, as the surrounding areas had patches of 0.2km visibility.
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Come on … 570ft DA for 600ft
Do you really think a real met station can measure a celling with a 30ft precision?
Do the test again with a bit higher celling … You are asking probably too much. Code is maybe not able to take the pure threshold reference for altitude inducing a bit of Delta between actual cloud layer and ground.
Try 700 ft at least.but more likely is the weather map shifted and put Aviano in below-minimum conditions, as the surrounding areas had patches of 0.2km visibility.
Highly possible also. Don’t use wmap for test but Deterministic.
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About the (2)
This is indeed something I get seen in the past but was only when I was wingman! And I thought it was fixed.
Will try to repro.
While the (1) is not really a bug to me, the (2) is more a nasty one. Not showstopper but really infamous. -
Come on … 570ft DA for 600ft
Do you really think a real met station can measure a celling with a 30ft precision?
Do the test again with a bit higher celling … You are asking probably too much. Code is maybe not able to take the pure threshold reference for altitude inducing a bit of Delta between actual cloud layer and ground.
Try 700 ft at least.Just to be clear, the reported issue is not with why the airbase is closed, why I get diverted to the alternate or if I could (not) land according to correct procedures, but 1) which alternate I’m sent to, and 2) the steerpoint moving.
I don’t see how or why the exact meteo settings are relevant in this?
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Just to be clear, the reported issue is not with why the airbase is closed, why I get diverted to the alternate or if I could (not) land according to correct procedures, but 1) which alternate I’m sent to, and 2) the steerpoint moving.
I don’t see how or why the exact meteo settings are relevant in this?
Okay.
- Request approach straight after departure (e.g. in case of simulated or actual emergency situation): ATC will tell you the base you just departed from is closed, but will then suggest the closed airbase as alternate.
Now I understand.
Well … could be something tied to the fact that the other airbases are non accessible too (?) I don’t know. IRL ATC “do not suggest” you anything. It is up to you to define where you intent to divert depending on your mission planning and bad weather strategy. But they can gives you other met report. Well … this is maybe a unplanned case (?)