Leerjet 35/36 Developed for Training Purposes 4D-3
February 1998
Fire Protection
Fire Protection
The fire protection system is composed of a detection system
and an extinguishing system. The detection system gives a
visual warning in the cockpit if it senses an overheat condition
or a fire in either nacelle. The engine fire extinguishing system
includes two independent fire bottles; these can be discharged
to either nacelle, or one bottle can be discharged to each
nacelle.
A portable fire extinguisher is stowed inside the aircraft.
Fire Detection
Three sensing elements connected to a detection unit monitor
temperature around the engine accessory gearbox, firewall,
and tailcone areas.
At normal operating temperatures, the resistance of the sens-
ing elements is high and current does not flow across the sens-
ing element’s core. If the temperature in the accessory gearbox
or firewall area reaches 410×F (210×C) or 890×F (477×C) in
the tailcone area, resistance of the affected sensing element
decreases until current flows across its core. Current flow then
triggers the detection unit to illuminate the associated FIRE
PULLor ENG FIRE PULL T-handle. Illumination of the T-handle
also triggers the Master Warning lights.
Pulling an illuminated FIRE PULL or ENG FIRE PULL T-handle
closes the engine’s main fuel, hydraulic, and bleed air shutoff
valves. It also illuminates the fire extinguisher bottle ARMED
lights above the T-handle.
To Next Page
Loading...
