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engine and APU fire control panel unlocks. When you pull the
APU fire warning handle switch up, a signal goes to these
components:
* APU generator control unit - opens the APU generator
breaker
* APU control unit - shuts down the APU.
When you turn the fire warning handle switch right or left, 28v dc
goes to the APU extinguisher bottle. This causes the APU fire
extinguisher bottle squib to release the halon.
You get the same results when you use the APU remote control
panel P28. When you pull the fire handle switch on the P28
panel, a signal goes to these components:
* APU generator control unit - opens the APU generator
breaker
* APU electronic control unit - shuts down the APU.
The bottle discharge switch also arms.
The bottle discharge switch sends 28v dc to the APU
extinguisher bottle. This causes the APU extinguisher bottle
squib to release the halon.
When the APU fire extinguisher bottle pressure is less than 250
psi, the pressure switch makes the amber APU BOTTLE
DISCHARGED light on the engine and APU fire control panel
come on.
Extinguisher Bottle Squib Test
You do a test of the APU fire extinguisher bottle squib with the
EXT TEST switch on the engine and APU fire control panel. The
switch in position 1 or 2 sends low voltage to the APU squib. If
there is continuity through the squib, the green light comes on.
When you release the test switch, the light goes out.
NOTE: You do a test of the engine fire extinguisher bottle
squibs from positions 1 and 2.
Training Information Point
The fire extinguishing system is connected to the 28v dc hot
battery bus. Any time you operate the APU fire handle switches,
the APU fire extinguisher bottle discharges.
FIRE PROTECTION - APU FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FIRE PROTECTION - APU FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION
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Purpose
The cargo compartment fire extinguishing system extinguishes
fires in these cargo compartments.
* Forward
* Aft.
General Description
The lower cargo fire compartment extinguishing system has
these components:
* Two fire extinguishing bottles.
* Five discharge nozzles.
The fire extinguishing bottles contain halon 1301 fire
extinguishing agent pressurized with nitrogen. Tubing
connects the bottles to the discharge nozzles in the cargo
compartment ceilings.
FIRE PROTECTION - CARGO COMPT FIRE EXTINGUISHING - INTRODUCTION
EFFECTIVITY
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Operation
To operate the cargo compartment fire extinguishing system
you do these things:
* Push the related cargo fire warning switchlight
* Lift the guard to the DISCH switchlight
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