This standard covers the following types of fire detection instruments intended for use in protecting aircraft cargo compartments, galleys, electronic equipment bays and other similar installations.

Type I: Carbon monoxide, an instrument which will actuate an alarm signal when the concentration of carbon monoxide in air exceeds a specified value.

Type II: Smoke detector, electronic, an instrument operating on the principle of smoke particles modifying the relationship between a light beam and electronic light sensor which will actuate an alarm signal when the concentration of smoke in air exceeds a specified value.

Type III: Smoke detector, visual, an instrument which, by visual means, will show in a positive manner the presence of smoke when the concentration of smoke in air exceeds a specified value.

Type IV: Smoke detector, electronic, an instrument operating on the principle of smoke particles modifying the current in an ionization chamber which will actuate an alarm signal when the concentrations of smoke in air exceeds a specified value.

Type V: Same as Type IV except maximum operating altitude is 18,000 ft. (5,486 M) when installed in a non-pressurized area.

The following documents shall form a part of this specification to the extent specified herein:

Federal Aviation Regulation 25.1359(d) and Appendix F thereto.

"Rules For SAE Use of SI (Metric) Units - SAE Document J916B", Dated July 1975 - Copies may be obtained from Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA., 15096.

Radio Technical Commission of Aeronautics (RTCA) Document DO-160B "Environmental Conditions and Test Procedures for Airborne Equipment", Dated July 20, 1984 (copies may be obtained from the RTCA Secretariat, 1425 K Street, N.W. Washington, D.C. 20005).