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the 1 or 2 position. The green test lights have a push-totest
function.
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Functional Description
When you hold the EXT TEST switch in position 1, power goes to
two logic circuits in the engine and APU fire control panel. The
dual No. 1 squibs on the left and right fire extinguishing bottles
are also connected to the logic circuits. When there is electrical
continuity through the dual squib, a green light comes on. If the
green light does not come on during test, the squib has to be
replaced.
When you hold the EXT TEST switch in position 2, the dual No. 2
squibs test is done for electrical continuity on the left and right
engine fire extinguisher bottles.
NOTE: You do a test of the APU fire extinguisher bottle squib
from position 1 and 2 of the EXT TEST switch.
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Purpose
The APU fire extinguishing system extinguishes fires in the APU
compartment.
General Description
The APU fire extinguishing system floods the APU compartment
with halon to extinguish the fire. One fire extinguisher bottle
supplies the halon to the APU compartment.
Physical Description
These are the components of the APU fire extinguishing system:
* Engine and APU fire control panel
* APU fire extinguishing bottle
* APU remote control panel.
Location
The APU fire extinguishing bottle is in the horizontal stabilizer
accessory compartment.
The engine and APU fire control panel is in the flight
compartment on the P8 panel.
The APU remote control panel P28 is in the right main wheel
well, on the aft bulkhead.
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Operation
When there is a fire condition, the APU fire warning switch
unlocks. You can also use the warning switch override under
the handle to unlock the switch. When you pull the APU fire
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