A typical halon 1301 aircraft engine extinguishing system is composed of fire detection sensors linked to cockpit warning lights, halon bottle(s) pressurized by nitrogen at 600 psi, tubing from bottles to strategically placed nozzles, and a pilot-actuated linkage (mechanical, electrical, pneumatic) connecting the cockpit to the halon bottle(s). See Figure A.3.
It should be noted that no single-engine naval aircraft has fire extinguishers in the engine bay. This is based on the premise that, should a fire start because of battle damage or a severe fuel leak and be extinguished, it makes little sense to restart the engine after having once cut off the fuel that was feeding the fire.
Dry bays or void areas alongside or beneath fuel tanks, and through which fuel lines may pass, are susceptible to explosions and fires if combat damage is suffered. Protection measures employed include solid foams, inert gas generating systems, and halon 1301. In such an application, a halon 1301 system would activate automatically in milliseconds upon detection of an explosion kernel by optical flame detectors.