(a) The applicant must design airplane flight control systems to:

1. (1) Operate easily, smoothly, and positively enough to allow proper performance of their functions.
2. (2) Protect against likely hazards.

(b) The applicant must design trim systems, if installed, to:

1. (1) Protect against inadvertent, incorrect, or abrupt trim operation.

2. (2) Provide a means to indicate—

   1. (i) The direction of trim control movement relative to airplane motion;
   2. (ii) The trim position with respect to the trim range;
   3. (iii) The neutral position for lateral and directional trim; and
   4. (iv) The range for takeoff for all applicant requested center of gravity ranges and configurations.