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:
| Number of passenger seats | Minimum main passenger aisle width | |
|---|---|---|
| Less than 25 inches from floor | 25 inches and more 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:
| Number of passenger seats | Minimum main passenger aisle width (inches) | |
|---|---|---|
| Less than 25 inches from floor | 25 inches and more 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. | ||