valve as well. A small, red shutoff valve light,
commonly called a “pinhead light,” will illu-
minate to indicate the FIRE warning light has
been depressed. Power is also applied to arm the
respective amber ARMED lights (Figure 8-4).
Depressing an illuminated ARMED light mo-
mentarily applies DC power to an explosive
cartridge, which discharges the contents of a
bottle to the selected engine. Depressing the
adjacent ARMED light fires the remaining
bottle to the same engine. Depressing the FIRE
warning light a second time disarms the sys-
tem (ARMED lights go out), opens the hy-
draulic and fuel shutoff valves, and
extinguishes the pinhead light.
Airplanes Without Glareshield
Warning Lights
Opening the red guard and actuating a FIRE-
WALL SHUTOFF switch (LH or RH) selects
the engine to which fire-extinguishing agent
is to be applied. It also applies 28 VDC to
close the hydraulic and fuel shutoff valves
(Figure 8-5) and arms the No. 1 and No. 2 dis-
charge switches.
Depressing the No. 1 discharge switch fires
a bottle to the selected engine. If a second
charge of extinguishing agent is desired, de-
pressing the No. 2 discharge switch fires the
remaining bottle to the same engine.
Returning the guarded FIREWALL SHUT-
OFF switch to the off position opens the hy-
draulic and fuel shutoff valves and disarms
the fire-extinguishing system.
8-4
FOR TRAINING PURPOSES ONLY
To Next Page
Loading...
