| WAC Help - Creating an Junkers Ju 52 - Wheels Disappear when flying |

Hello.
I’m creating a Ju 52 used by the German military in WWII and many more after the war and before.

https://vignette2.wikia.nocookie.net/ruse/images/1/16/Ju52Tom2006.jpg/revision/latest?cb=20110520154002

But I’m having a problem. When I would fly the plane for about 30 seconds the wheels would disappear out of nowhere. I have no clue what to do here.

Any help would be appreciated!