feat(eis): move trans alt/lvl to arinc bus

[BlueberryKing]

Fixes #[issue_no]

Summary of Changes

Utilize the FMGC DMC bus to transmit transition altitude and transition level. This should not have any visible effect. However, it gets rid of the undocumented L:AIRLINER_TRANS_ALT and L:AIRLINER_APPR_TRANS_ALT variables.

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

• Check that the QNH/STD indication on the PFD still blinks once the aircraft crosses the transition altitude/level in the climb/descent.
• Check that there is no blinking when the corresponding fields are empty in the MCDU.

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[Sioux812]

Just to further clarify this topic further, Thales logic for the APPR Perf page will auto populate whatever the typical Transition FL is for that country/region plus 500ft. This is to prevent the PFD altimeter settings flashing if pilots were instructed to level off at the Transition Level during descent (pilots should be on the provided altimeter anytime at and below the transition level). So, for example we would see on the APPR performance page "TRANS FL" and below FL45 (or FL65, FL185, etc.).

[BlueberryKing]

Just to further clarify this topic further, Thales logic for the APPR Perf page will auto populate whatever the typical Transition FL is for that country/region plus 500ft. This is to prevent the PFD altimeter settings flashing if pilots were instructed to level off at the Transition Level during descent (pilots should be on the provided altimeter anytime at and below the transition level). So, for example we would see on the APPR performance page "TRANS FL" and below FL45 (or FL65, FL185, etc.).

Thanks for the info! Yes, on Honeywell, the transition altitude and transition level should be imported from the navigation database as well. Unfortunately, we don't have access to this through MSFS. So in the A32NX, it's imported from the flight plan if one is uplinked from SimBrief.

[Sioux812]

Is it possible to make the FBW version auto add the 500ft to the transition level if it successfully uplinks one then?

[BlueberryKing]

Is it possible to make the FBW version auto add the 500ft to the transition level if it successfully uplinks one then?

To my knowledge, Honeywell inserts the transition altitude/level directly from the database without adding anything. So we will stick with this behavior for now.

Honeywell

vs Thales:

[Saschl]

QA Report

Tester: saschl
Date: 20.10.2023

Report:

1. Check that the QNH/STD indication on the PFD still blinks once the aircraft crosses the transition altitude/level in the climb/descent.
   PASS

2. Check that there is no blinking when the corresponding fields are empty in the MCDU.
   PASS

Summary:
Passed