(a) Except as provided in paragraph (b) of this section, for commuter category airplanes, the width of the main passenger aisle at any point between seats must equal or exceed the values in the following table: ------------------------------------------------------------------------
Minimum main passenger aisle width
---------------------------------------
Number of passenger seats Less than 25 25 inches and more
inches from floor from floor------------------------------------------------------------------------10 through 19................... 9 inches.......... 15 inches.------------------------------------------------------------------------
(b) When certification to the emergency exist provisions of Sec. 23.807(d)(4) is requested, the main passenger aisle width at any point between the seats must equal or exceed the following values: ------------------------------------------------------------------------
Minimum main passenger
aisle width (inches)
-------------------------
Number of passenger seats Less than 25 inches
25 inches and more
from floor from floor------------------------------------------------------------------------10 or fewer................................... \1\ 12 1511 through 19................................. 12 20------------------------------------------------------------------------\1\ A narrower width not less than 9 inches may be approved when
substantiated by tests found necessary by the Administrator. [Amdt. 23-34, 52 FR 1831, Jan. 15, 1987, as amended by Amdt. 23-46, 59 FR 25774, May 17, 1994]