Rudder trim
I talk last night with a friend Pilot of a dc-9 real life, he told me that rudder trim is very nesesary when near to touch down(landing) to compess and be more estabilized,and help me not to make a drastic movement in my rudder pedals,
Flight Simulator and other chat
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https://forums.simviation.com/phpBB3/viewtopic.php?f=20&t=53886