Why is trimming so difficult?
Taking a handful of rudder trim until the cow horns are level is not the right way to trim. You've also got to disengage the AP and correct for the lateral trim forces using aileron trim, after you have achieved zero heading change using the rudder trim.
This basic technique is so difficult to find in very many pilots, some of which have a hell of a lot of time. Are trainers out there actually overlooking this simple lesson when they are teaching because it is so simple, or what?
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Any chance of a flightdeck visit?