I am attempting to update runway lighting, etc. to an existing AFCAD2 (Groom Lake). However, it seems the runway light changes made in AFCAD are not having any effect to FS?

Are you sure that you dont have a duplicate in yourAdd on Scenery folder/sThere is a program called ScanAFD.exe that might be some help.AFCAD generally has very few problems and it is a pity thatthere are not more programs for FS9 scenery of the same caliber.The only other thing I can think off is the default elevationmight be a bit low. But usually you see bits of the runways etcdissapearTassie Tiger

If you have any addon scenery for that runway or the surrounding part of the airport - FS2004 will by design not show the AFCAD elements - rather the addon scenery elements.

Got it; thanks for the information.