(b) To provide for unsymmetrical loading when outboard fins extend above and below the horizontal surface, the critical vertical surface loading (load per unit area) determined under §25.391 must also be applied as follows:
(1) 100 percent to the area of the vertical surfaces above (or below) the horizontal surface.
(2) 80 percent to the area below (or above) the horizontal surface.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–86, 61 FR 5222, Feb. 9, 1996]