Code of Federal Regulations Title 46. Shipping § 46.177.820 Seating

(1) An aisle of not more than 4.572 meters (15 feet) in overall length must be not less than 610 millimeters (24 inches) in width.

(2) An aisle of more than 4.572 meters (15 feet) in overall length must be not less than 760 millimeters (30 inches) in width.

(3) Where seats are in rows, the distance from seat front to seat front must be not less than 760 millimeters (30 inches) and the seats must be secured to a deck or bulkhead.

(4) Seats used to determine the number of passengers permitted, in accordance with § 176.113(b)(3) of this chapter, must be secured to the deck, bulkhead, or bulwark.