Hi Smiffy. Can you give me an example. Missing parts is a common enough problem with some earlier 3rd party FS2002 aircraft in FS9 but I've never come across it in FS2002.

I suspect you might be referring to the Virtual Cockpit (VC) or interior views of external parts from the cockpit. Some aircraft have a VC while others do not. This is a matter of preference for the author. If you want views of the engines & other parts of aircraft without a VC from the cockpit the only answer is to use a panel with these extra views incorporated in it like the one in the default Lear45. This is not a proper DVC as used on most of the other defaults & later 3rd party aircraft.