ED Decision 2003/13/RM
(a) Control surface hinges, except ball and roller bearing hinges, must have a factor of safety of not less than 6.67 with respect to the ultimate bearing strength of the softest material used as a bearing.
(b) For ball or roller bearing hinges, the approved rating of the bearing may not be exceeded.
(c) Hinges must have enough strength and rigidity for loads parallel to the hinge line.
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