Text in force at 23-63: from 23-46, effective 16 Jun 1994.
[(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 SeatsLess than 25 inches from floor25 inches and more from floor 10 through 199 inches15 inches (b) When certification to the emergency exit 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 SeatsLess than 25 inches from floor25 inches and more from floor 10 or fewer1 1215 11 through 191220 1 A narrower width not less than 9 inches may be approved when substantiated by tests found necessary by the Administrator.]
59 FR 25774 · Source