The aircraft is equipped with a single shot bromo-chloromethane (CB) engine fire extinguishing system. The system incorporates two CB spherical containers, one located
on each engine nacelle. A fire detection circuit is also provided for each engine.
NOTE: The CB fire extinguishing system is connected directly to the batteries and will
operate regardless of battery switch position.
Engine Fire Extinguisher Switches:
Two guarded ON-OFF fire extinguisher switches, one for the left engine and one for the right engine are located under the hinged door on the flight compartment floor between the pilot’s and co-pilot’s seats. When either switch is set to the ON position, a 28-volt DC circuit is energized to discharge the CB agent to the respective spray ring around the engine.
Firewall Shutoff Valve Handles
The firewall shutoff valve handles for shutting off the flow of fuel, engine oil, and hydraulic fluid are located under the engine fire extinguisher access door. The shutoff valves are connected by cables to the handles. In case of fire in either engine, the corresponding handle is pulled, shutting off the flow of fuel, engine oil, and hydraulic fluid to that engine.
Engine Fire Detection Warning System
Two 28-volt DC fire detection press-to-test warning lights, on for each nacelle, are located on the main instrument panel. The system has a thermocouple circuit for detecting fire. When either engine fire detector circuit detects fire, the respective fire warning light for that circuit illuminates.
Fire Detector Test Switch
A 28-volt fire detector pushbutton test switch, located adjacent to the warning lights, provides a method of checking the fire detection warning circuits.
