Airport surface texture type is stored in the bgl file as a byte value. When bglcomp is used to create an airport bgl, an enumerated list of surface types is used. the values and their corresponding types are:(values in dec)00 Concrete (same value is compiled when Cement is specified)01 Grass02 Water04 Asphalt07 Clay08 Snow09 Ice12 Dirt13 Coral14 Gravel15 Oil treated16 Steel mats17 Bituminous18 Brick19 Macadam20 Planks21 Sand22 Shale23 Tarmac254 UnknownAFCAD2 does not use bglcomp, and has implemented the following additional values:05 Grass206 Grass307 Turf (note same as Clay in bglcomp)10 Unknown211 Unknown3As noted not all values for the surface result in different textures being called.scott s..

I assume that I must just have 'goofed' in some simple thing when I tried to replace the texture - it is a bit of a 'no brainer' that replacing a texture with one of the same name (and same format) should work: but since I was doing this to sort out a problem that I then managed to solve in a much more 'elegant' fashion (won't waste AVSIM's bandwidth with irrelevant details!), I didn't try again and just restored the original 'coral' file. I'll copy the info in this thread though (byte values & the useful bitmap chart) and have a look again the next time I want to install a custom texture.Thanks again for the informationMartin