ORIGINAL: jetmech05
I am not familiar with your airplane, but, it seems to me if the center section is up good and is mechanically connected to the other 2 sections of flap.....then you need to adjust the outboard section of flap mechanically.....The servo buzzed because you were up against the flap stop and were over driving the servo.....a servo giving more torque mifgt damage the center section of your flaps
Agree with jetmech05. The buzzing is most likely because the servo is being commanded to a position just beyond the mechanical stop on your flap and the servo is trying to move a little more toward the up position. However, your flap linkage doesn't allow it to travel that far.