Getting split second of seeing interior of aircraft mostly on ground, maybe fps problem,  any know cure for this, have i7 cpu, all other aircraft seem to be fine other than my 777, thanks for any help, newbie,,

It's a limitation of FSX texture loading. Nothing you can really do about it.

Faster GPU with more Graphics ram, Faster actual ram, SSD's, ... will reduce the amount of time you see the effect, but it's still gonna be there I reccon.