CPH-R From Denmark, joined May 2001, 5864 posts, RR: 3 Reply 2, posted (6 months 2 weeks 4 days 10 hours ago) and read 4202 times:
The easiest way to make sure the fltsim section isn't missing something vital, is copying a previously existing one and then changing the required details. Most of the sections are fairly obvious and there are only 3 sections that can "break" it:
sim= has to match the .air file in the aircraft folder you're installing to (no .air file needed at the end)
model= has to match a valid model folder (leave it blank if there's only a single model folder)
texture= has to match a valid texture folder.
Everything else can be customized to your own wish.