I posted this on discord too, so
Can you guys try the following:
Goto MSFS ASSISTANCE options and FAILUR/DAMAGE.
Disable AIRCRAFT STRESS and CRASH DAMAGE ... Reload the Sim and try again.
It was said that there is/was an issue with it for this plane (and is was noted and will be fixed iirc )
For a very good starter, why is it not mentioned nowhere, (esp from inibuilds) that there is very good video material available for the A300.
Its for the X-Plane version, but nevertheless ....!!
Start here :
Oliver