A32nx: [BUG] [MCDU] Transition ALT is defaulted to 10000ft

[St54Kevin]

Mod Version


master of 23rd of Nov 20

Describe the bug

Transition ALT on the takeoff or Approach page is defaulted to 10000ft. It should be taken from the nav database and inserted automatically depending on the DEP/ARR airport.

References

IRL experience

Additional context

Was this working before/when did the issue start occurring?

Is this a problem in the vanilla unmodded game?

Discord username (if different from GitHub):

[Benjozork]

We need to see if we can find this using the info provided by FacilityLoader.

Otherwise, correct me if I'm wrong, but couldn't we use our online ATIS for this if we can't find it using FacilityLoader ?

[St54Kevin]

We need to see if we can find this using the info provided by FacilityLoader.

Otherwise, correct me if I'm wrong, but couldn't we use our online ATIS for this if we can't find it using FacilityLoader ?

Do you have actual ATIS for every airport out there? Also when airports are closed, there is no ATIS. Also only ARR ATIS has a TL. But the plane need the TA. So I dont think thats a proper solution

[St54Kevin]

Of course. But is it reliable?

[CBGonzalez]

As far as I can see, the current nav data in MSFS does not contain the transition altitude for airports (there´s no documented field for it at least).

[beheh]

The ToLiss has a setting for this in it's ISCS. For now we could make it user-configurable in the MCDU until we have a better source (as I believe it's usually the same per-country or at least per-region). This applies on takeoff only.

[St54Kevin]

As far as I can see, the current nav data in MSFS does not contain the transition altitude for airports (there´s no documented field for it at least).

What about navigraph?

[Kimbyeoungjang]

i setup the default trans alt to 10,000ft because that was MCDU default value.
currently, there is no automatically trans alt input. you manually insert that value.

[danieldjewell]

As @St54Kevin mentioned, I don't think ATIS is a reliable source for TA/TL. (Which also raises another point to be mindful of -- Transition Altitude and Transition Level are two different numbers. Often they are the same, but not always. This article on Code 7700 offers a nice explanation of the differences - with references to the ICAO source documents.)

That said, I believe that TL/TA is on a per-country basis - that is, it doesn't change airport-to-airport within a single country? (Similar to how a country standardizes on giving QNH (or QFE for that matter) in hPa or inHg.)

Would a temporary work-around be a simple array to lookup the default? (e.g. in the US, 18,000/FL180, etc.?)

[CBGonzalez]

As far as I can see, the current nav data in MSFS does not contain the transition altitude for airports (there´s no documented field for it at least).

What about navigraph?

Wouldn´t know, dont´have it anymore...

[CBGonzalez]

Maybe, for the time being, the field could display as [ ], as specified in the Honeywell manual (Preflight 4-82) when the transition altitude is not in the database?