ok, first off ensure you've got the latest ac installer, currently it's version 3.8.
Then open your air.ini file. It's in MODS\STD\com\maddox\il2\objects.
add this line to it:
TyphoonMkIB air.TYPHOON1B 1 NOINFO gb01 SUMMER
just copy and paste it. Depending on where you paste it will depend on where the aircraft appears in the in-game lists (eg in QMB). Best to put it in its alphabetical place. Save the air.ini file.
Then open planes.ru (located in MODS\STD\i18n ) and paste this line:
TyphoonMkIB Typhoon MK.IB, 1942
Save the file.
Open the weapons.ru file, located in the same place as the air.ru file and paste this line on the bottom of the list:
#####################################################################
# Typhoon Mk.IB
#####################################################################
TyphoonMkIB.default Default
TyphoonMkIB.light Lightened
TyphoonMkIB.2xdt 2xDroptank
TyphoonMkIB.2x500 2x500 lb. Bombs
TyphoonMkIB.2x1000 2x1000 lb. Bombs
TyphoonMkIB.8x5 8x60 lb. Rockets
TyphoonMkIB.none Empty
Then create a folder in paintschemes\skins and name it:
TyphoonMkIB
Hopefully, the plane will now be available for qmb and everything else!
Annoying the annoying, so you don't have to.