I have been using Rikooo A330 and its wonderfull, but recently i tried some other products such as MD-11 and 777
Those products keeps on crashing once airborne. if I do some manuveors P3D will crash.
Hope I get some solution to this.
I was also using all of them on FSX,without any problem. You have to make sure that planes you are using are compatible with your P3D. When you open the page of ,let's say-MD-11,you will see this: For FSX & FSX-Steam & Prepar3D v1 (v2 & 3 to test) ,so you have to make sure that it's compatible.
Just like it says,v2 and v3 to test,errors are quite possible.
Hope this helps.