Let's put this to practice with a quick pattern you can fly in a few minutes.
I've just cross checked again with the GNS V2 and the GTN, both working the same:
Start with the Baron 58 at KVPS RWY19
Select the procedure KPVS | RNAV 01 with transition: YOUNK.
Preselect 2500 ft on the A/P
Takeoff, positive climb, gear up, arm autopilot NAV + ALT modes
Set simulator time acceleration to x4 (menu Options | Simulation Rate)
Note how well it tracks with time acceleration, another time try x128 too!
Before YOUNK, set time acceleration back to x1
GPS Selected Auto / Engage APPR Enabled:
right in the middle of the turn to ELISS, the APPR mode arm, the ALT stays, once G/S crosses it starts descending.
GPS Selected Auto / Engage APPR disabled:
right after the turn to ELISS when the G/S is live, press the APPR button on the autopilot. Once G/S crosses it starts descending.
GPS Selected Manual:
right after the turn MSG flashes, tells you to use PROC before APPR. Press the PROC button, enable the A/P APPR output, then press the APPR button on the autopilot.
NB: this works equally well in XP11/10/9.
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