Sec. 135.155 - Fire extinguishers: Passenger-carrying
No person may operate an aircraft carrying passengers unless it is equipped with hand fire extinguishers of an approved type for use in crew and passenger compartments as follows --
(a) The type and quantity of extinguishing agent must be suitable for the kinds of fires likely to occur;
(b) At least one hand fire extinguisher must be provided and conveniently located on the flight deck for use by the flight crew; and
(c) At least one hand fire extinguisher must be conveniently located in the passenger compartment of each aircraft having a passenger seating configuration, excluding any pilot seat, of at least 10 seats but less than 31 seats.