About This File
Firstly: This file does not contain an aircraft. Rather it's a tweak made to the existing Third Wire A-10A and A-10A_78, both of which are part of the default planeset that ships with Strike Fighters 2 Europe. I've uploaded it here, because there wasn't a subsection set up specifically for aircraft .ini tweaks 
Anyway......
SF2E A-10 Tweaks
by Fubar512
Installation: Simply drop the aircraft data files into their matching-named folders.
In Windows XP, the folder path would be:
My Documents/ThirdWire/StrikeFighters2x/Objects/Aircraft.
In Windows Vista or Windows 7, the path is:
Documents/<User Name>/Saved Games/ThirdWire/StrikeFighters2x/Objects/Aircraft.
Now that you have some idea as to SF2's file path, you can go onto the next step.....and that's to drop the included A10Engine.wav into the ThirdWire/StrikeFighters2x/Sounds folder. If you don't have one, don't panic, just create one, following the path statement above.
To uninstall: just delete the A-10A_Data.ini, and the A-10A_78_Data.ini, and the game will revert to using the TW default.