The main passenger aisle width between seats must equal or exceed the values in the following table: ------------------------------------------------------------------------
Minimum main passenger
aisle width
-------------------------
Passenger seating capacity Less than 25 Inches
25 inches and more
from floor from floor
(inches) (inches)------------------------------------------------------------------------10 or less.................................... 12 1511 through 19................................. 12 2020 or more.................................... 15 20------------------------------------------------------------------------\1\ A narrower width not less than 9 inches may be approved when
substantiated by tests found necessary by the Administrator. [Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-12, 41 FR 55472, Dec. 20, 1976]