CS 25.851 Fire extinguishers

• ED Decision 2016/010/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

CS 25.851 Fire extinguishers ED Decision 2016/010/R (See AMC 25.851) (a) *Hand fire extinguishers*. (See [AMC 25.851(a)](#_DxCrossRefBm1709821317).) (1) The following minimum number of hand fire extinguishers must be conveniently located and evenly distributed in passenger compartments. (See [AMC 25.851(a)(1)](#_DxCrossRefBm1709821317).): <table border="1" cellpadding="0" cellspacing="0" width="529"><thead><tr><td valign="top" width="266"><p><b>Passenger capacity </b></p></td><td valign="top" width="264"><p><b>Number of extinguishers </b></p></td></tr></thead><tr><td valign="top" width="266"><p> 7 to 30 </p></td><td valign="top" width="264"><p>1 </p></td></tr><tr><td valign="top" width="266"><p> 31 to 60 </p></td><td valign="top" width="264"><p>2 </p></td></tr><tr><td valign="top" width="266"><p> 61 to 200 </p></td><td valign="top" width="264"><p>3 </p></td></tr><tr><td valign="top" width="266"><p> 201 to 300 </p></td><td valign="top" width="264"><p>4 </p></td></tr><tr><td valign="top" width="266"><p> 301 to 400 </p></td><td valign="top" width="264"><p>5 </p></td></tr><tr><td valign="top" width="266"><p> 401 to 500 </p></td><td valign="top" width="264"><p>6 </p></td></tr><tr><td valign="top" width="266"><p> 501 to 600 </p></td><td valign="top" width="264"><p>7 </p></td></tr><tr><td valign="top" width="266"><p> 601 to 700 </p></td><td valign="top" width="264"><p>8 </p></td></tr></table> (2) At least one hand fire extinguisher must be conveniently located in the pilot compartment (see [AMC 25.851(a)(2)](#_DxCrossRefBm1709821319)). (3) At least one readily accessible hand fire extinguisher must be available for use in each Class A or Class B cargo or baggage compartment and in each Class E or Class F cargo or baggage compartment that is accessible to crewmembers in flight. (4) At least one hand fire extinguisher must be located in, or readily accessible for use in, each galley located above or below the passenger compartment. (5) Each hand fire extinguisher must be approved. (6) The required fire extinguishers located in the passenger compartment must contain an accepted extinguishing agent that is appropriate for the kinds and classes of fires likely to occur where used. (7) The quantity of extinguishing agent used in each extinguisher required by this paragraph must be appropriate for the kinds of fires likely to occur where used. (8) Each extinguisher intended for use in a personnel compartment must be designed to minimise the hazard of toxic gas concentration. (b) *Built-in fire extinguishers*. If a built-in fire extinguisher is provided – (1) Each built-in fire extinguishing system must be installed so that – (i) No extinguishing agent likely to enter personnel compartments will be hazardous to the occupants; and (ii) No discharge of the extinguisher can cause structural damage. (2) The capacity of each required built-in fire extinguishing system must be adequate for any fire likely to occur anywhere in the compartment where used, considering the volume of the compartment and the ventilation rate. (see [AMC 25.851(b)](#_DxCrossRefBm1709821318)). (c) Fire-extinguishing agents (See [AMC 25.851(c)](#_DxCrossRefBm1709821317)) (1) Fire classes against which fire-extinguishing agents may be employed are: — Class A: Fires involving ordinary combustible materials, such as wood, cloth, paper, rubber and plastics; — Class B: Fires involving flammable liquids, petroleum oils, greases, tars, oil base paints, lacquers, solvents, alcohols and flammable gases; — Class C: Fires involving energised electrical equipment where the use of an extinguishing agent that is electrically non-conductive is important. [Amdt 25/4] [Amdt 25/8] [Amdt 25/12] [Amdt 25/18]