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pressure vessel area. The following subsystems, units and components together
compose this system:
• Engine Fire Extinguishing System
• APU Fire Extinguishing System
• Portable Fire Extinguishing System
The engine and APU fire extinguishing systems use Halon™1301 (CF3Br)
pressurized with gaseous nitrogen. A relatively nontoxic and noncorrosive agent,
Halon™ 1301 works by chemically interfering with the combustion process. Both
the engine and APU fire extinguishing systems remain fully operative down to and
including battery-only power configuration.
Two portable fire extinguishers are installed in production standard aircraft. The
cockpit fire extinguisher contains either Halon™ 1211 or Carbon Dioxide (CO2).
The cabin fire extinguisher is filled with water.
2. Description of Subsystems, Units and Components:
A. Engine Fire Extinguishing System:
The engine fire extinguishing system, shown simplified in Figure 7, is
classified as a “two shot” system. It consists of a left and right fire bottle
and associated agent discharge handle (rotary switch) for the aircraft
engines. Power for the system is supplied from the 28V Essential DC bus.
(1) Fire Extinguishing Bottles:
Two identical, single-shot fire extinguishing bottles are mounted on
the left and right sides in the tail compartment. Each single-shot
bottle is loaded with 5.6 pounds by weight of Halon™ 1301 and is
charged with nitrogen to 600 +25 / -0 psi at 70° F. Each bottle has
two firing heads, each containing an electrically-fired dual-squib
cartridge. Either head being fired discharges the extinguishing agent
into the distribution system. The bottles are fired by switches
activated by rotation of the FIRE handle to the left or right.
Each bottle contains a thermal discharge device. If excessive
temperature builds up within a fire bottle, a frangible disc ruptures
and the entire contents of the bottle is discharged into the tail
compartment. If excessive pressure builds within up the bottle, a
blowout disc in the thermal discharge port ruptures at 1600 ±200
psi, releasing the contents into the tail compartment.
Each bottle has an incorporated pressure gauge which can be
viewed from outside the aircraft through a small window built into the
skin adjacent to the bottles. The windows, located on each side of
the fuselage under the pylon, are used to check bottle pressure
during preflight inspections.
(2) Extinguishing Agent Plumbing:
The extinguishing agent plumbing routes extinguishing agent from
the fire bottle to the engine cowling interior areas. Crossover lines
and double-check tees provide the capability to discharge either
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-26-00
Page 17
January 31/02
Revision 6
bottle to either engine or both bottles to one engine.
On each side, the line from the common side of the double-check
tee is routed through the pylon into the engine fire zone. The agent
is then distributed by means of a distribution line which runs fore and
aft with dual nozzles at each end.
(3) Fire Handles:
Located on the forward portion of the cockpit center pedestal and
shown in Figure 8, the FIRE handles are labeled L (for left) and R
(for right). They are normally locked in the IN position. When a valid
fire signal is provided by the engine fire detection system, an
internal lock-release solenoid is automatically energized, allowing
the associated FIRE handle to be pulled to the OUT position. A
manual override button is also provided underneath each handle to
override the lock-release solenoid, allowing the FIRE handle to be
pulled to the OUT position at all times.
Pulling the FIRE handle OUT approximately ½ to ¾ inches causes
the following to occur:
• Engine fuel shutoff valves will close
• Hydraulic shutoff valves will close
• Alternator will be shut off
• Thrust reverser will be disabled
Once in the OUT position, each FIRE handle is capable of rotation
to two positions, labeled DISCH 1 and DISCH 2. Rotation of the
handle to the appropriate position supplies 28 VDC power to the
associated cartridge on the bottle. Application of power detonates
the squib, freeing the extinguishing agent to flow to the affected
engine. Discharge logic is shown in the following table:
FIRE HANDLE
PULLED
ROTATED TO DISCHARGES INTO
L
DISCH 1 LEFT Fire Bottle Left Engine
DISCH 2 RIGHT Fire Bottle Nacelle
R
DISCH 1 RIGHT Fire Bottle Right Engine
DISCH 2 LEFT Fire Bottle Nacelle
NOTE:
Once a fire bottle has been discharged, it must be
　
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