TITLE 14 - AERONAUTICS AND SPACE

CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

SUBCHAPTER C - AIRCRAFT

PART 25 - AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES

subpart c - STRUCTURE

25.393 - Loads parallel to hinge line.

  (a) Control surfaces and supporting hinge brackets must be designed for inertia loads acting parallel to the hinge line.

  (b) In the absence of more rational data, the inertia loads may be assumed to be equal to KW, where (1) K=24 for vertical surfaces; (2) K=12 for horizontal surfaces; and (3) W=weight of the movable surfaces.