The applicant must design airplane flight control systems to:
Operate easily, smoothly, and positively enough to allow proper performance of their functions.
Protect against likely hazards.
The applicant must design trim systems, if installed, to:
Protect against inadvertent, incorrect, or abrupt trim operation.
Provide a means to indicate—
The direction of trim control movement relative to airplane motion;
The trim position with respect to the trim range;
The neutral position for lateral and directional trim; and
The range for takeoff for all applicant requested center of gravity ranges and configurations.