trimmers isn't part of OPB-1 ... ofcourse on Il4 SB2 Pe2 Pe8 you have trimmers and you can do that course adjustments.. TB3 haven't rudder trimmers in old version ... was just replaced old strange bomb sight to OPB-1 and all other part was stay the same ...
or you some how use trimmers on TB3 with old bombsight in 4.13.4?
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