fix(a380x/fctl): Protection speeds improvements after flight model update

[flogross89]

Fixes #9689
Fixes #8725
Fixes #9846

Summary of Changes

• Adapted zero lift alpha to MSFS flight model values:
  
• Adapt alpha max and alpha prot values to match existing references
• Fix high speed protection green double bar in PFD
• Fix protection markers in PFD (and add simplified FCDC in the process)
• Fix VMAX / VfeNext for CONF 1+F and CONF 1

Screenshots (if necessary)

vs

vs

vs

PFD direct law indications:

References

https://www.youtube.com/watch?v=hDh_9MEz-hg
https://www.youtube.com/watch?v=AI8yFhuEa4Q
https://www.youtube.com/watch?v=pHui34_ODnc
https://www.youtube.com/watch?v=qcXQKQukxkI&t=284s
https://www.youtube.com/watch?v=DtIF26FEZug&t=338s

Additional context

Note for reviewer: Only alpha max and alpha protection look-up tables were modified in the MATLAB models, no MATLAB review needed.

Current alpha tables:
alpha_max:

alpha_prot:

new alpha_0 table:

Discord username (if different from GitHub): floridude

Testing instructions

1. Verify protection markers (pitch&roll, overspeed) show correctly in PFD in normal and in direct law (disable all PRIMs for that)
2. Fly around, try to match PFD protection speeds to known references and report where they deviate
3. Even without looking at references, the aircraft should perform reasonably, e.g. shouldn't activate protections at green dot speed in clean conf in standard turns.

How to download the PR for QA

Every new commit to this PR will cause new A32NX and A380X artifacts to be created, built, and uploaded.

1. Make sure you are signed in to GitHub
2. Click on the Checks tab on the PR
3. On the left side, find and click on the PR Build tab
4. Click on either flybywire-aircraft-a320-neo, flybywire-aircraft-a380-842 (4K) or flybywire-aircraft-a380-842 (8K) download link at the bottom of the page

[lukecologne]

Looks good 👍

[Jonny23787]

Quality Assurance Trainee Report

Discord Username : jonny_23
Object of testing : #9694
Aircraft : A380X
Tier of Testing : 1
Date : 19/03/2025

Testing Process:

1. Verified protection markers were shown correctly on PFD in both normal and direct law.
2. Performed a test flight with multiple turns, checked that protections did not activate.
3. Performed multiple landings at various weights and confirmed VLS, alpha prot and alpha max values were within margin of error compared to references with the similar weather conditions and weights.
4. Performed a full flight with aircraft loaded to a realistic A380 LAW and confirmed protections were at appropriate speeds.

Testing Results:
Passed