4D-4 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Fire Extinguishing
Two dual-head single-shot fire extinguisher bottles contain
Halon 1301 (bromotrifluoromethane) pressurized to 600 ±75
PSI at 70×F (21×C) with nitrogen. Each bottle has a thermal
relief valve and a pressure gage.
Pressing an illuminated ARMED switchlight supplies 28V DC
from the Left or Right Essential (Essential B) bus to the associ-
ated bottle’s squib. The squib detonates to break the bottle seal
and release fire extinguishing agent to the affected engine
nacelle. Bottle discharge blows out the yellow discharge indica-
tor disc on the left rear fuselage. After bottle discharge, the
selected ARMED switchlight extinguishes.
If fire warnings persist, pressing the other illuminated ARMED
switchlight discharges the second fire extinguisher bottle into
the same engine.
Thermal Relief
If bottle temperature reaches 217×F (102.8×C), a thermal dis-
charge valve opens to vent bottle contents to atmosphere,
thereby blowing out the red colored discharge indicator disc.
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