Sec. 23.815 - Width of aisle.

(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 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           15
11 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]