Their directions are quite sparse. An 'Afcad' refers to a file created by the Afcad program to modify or create airports. In this case it is used to add the taxi routes and parking spots required for the ai traffic.
I mentioned in your other post:
'If you decide to install (any) UKMIL packages you should also get their Afcad downloads, a link is at the bottom of the download page. These will put the necessary parking at the airports....... Install the 'Latest_Afcad_Changes' package last.'
Here's the link-
Afcad downloadsDownload the 'Default Scenery'
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.