Is there anybody with this problem when in full autopilot mode, as you fly the altitude hold goes crazy until you press “B”. Then it goes back to normal for a little while and them does it again until you press “B” again.
Yes it looks like the autopilot captures et returns to the selected altitude but on the local QNH and not on standard setting (1013hPa or 29.92inHg) if you have passed transition altitude… “B” put the altimeter on the local QNH… So capture alt mode and hold alt mode don’t work.
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When you change barometer it changes the altitude and AP corrects for that
This is what I got back from Carenado; “Greetings,
The last MSFS2020 update have broken our aircraft, Asobo was already notified about this and they announced a fix in the next release, but it’s in their hands now.
Regards
Carenado.”
So it is a bug.
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It’s been a bug in MSFS since the beginning. I’ve explained this in other threads…
Essentially, there are three barometric pressure registers in FSX. The altimeter uses Baro:1, the AP Baro:2, and the Transponder Baro:3 they are not linked. So if you change the altimeter’s barometric pressure, you are not affecting the barometric pressure basis for the AP. If you hit B, it sets all three registers to the local indicated pressure. And now all three are working from the same altitude pressure basis (the Transponder incorrectly so, as it’s really supposed to ALWAYS display standard pressure altitude). So as @Hyperaspiste said, as you pass the transition altitude and set your Altimeter to standard pressure altitude, the AP Baro stays at local pressure altitude. The Asobo KAP140 has an option to set the barometric pressure in the AP. I don’t believe the Carenado one does (I might be wrong). So it is actually Carenado’s problem technically. They need to add the code to set the barometric pressure for the AP, or link it to the Alitimeter Baro.
For the OP @mobbe123 - What you describe is actually working as designed and as it’s supposed to based on your question. As you fly along and the local barometric pressure changes, often drastically in game. So when you cross that front in game, your autopilot will not remain at the correct altitude because it’s base barometric pressure is incorrect. Hitting the B key corrects it, as designed (but screws you up in the the flight levels).
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Thanks for this details.