Rudder trim is accomplished by which method?

Rudder trim in the C-17 is achieved by turning the knob on the alternate trim panel. This mechanism allows pilots to make adjustments to the rudder trim in a more controlled and intuitive manner. The alternate trim panel provides access to specific trim controls essential for enhancing aircraft stability and performance during various flight phases. Adjusting the rudder trim ensures that the aircraft maintains a straight flight path without the need for continuous rudder pedal input by the pilot.

The other methods mentioned involve different trim functions or controls that do not specifically address rudder trim adjustment. For instance, the stick grip trim switch typically operates other trim functions like aileron or elevator trim, while adjustments made through the lever behind the stick are unrelated to rudder trim specifically. The mission computer may handle various automated systems but does not directly allow for manual rudder trim adjustments. Thus, the choice of using the knob on the alternate trim panel is the most accurate and effective method for managing rudder trim in the C-17.