-
the BUS 301PP through the circuit breaker 2WF (APU FIRE SQUIB B) to the cartridge SQUIB B,

 -
the HOT BUS 701PP through the circuit breaker 3WF (APU FIRE VLV CTL) to the fire emergency-stop relay 5WF,

 -
the BUS 301PP through the circuit breaker 4WF (APU FIRE VLV CTL) to the fire emergency-stop relay 6WF,

 -
the BAT BUS 301PP through the circuit breaker 31WF (AUTOEXTING) to the automatic fire-extinguishing control circuit,

 -
the HOT BUS 702PP through the circuit breaker 2WC (ELS/HORN/SUPPLY) to the ground crew horn 6WC.

 5. Interface
_________
 The APU fire-extinguishing system has an inface with:

 -23-42-00 Cockpit to ground crew call system,
 -26-13-00 APU fire and overheat detection system,
 -28-29-00 APU LP fuel shut off,
 -31-52-00 FWC,
 -32-62-00 Landing gear - position information,
 -49-62-00 APU emergency shutdown.
 6. Component Description
_____________________
 (Ref. Fig. 001)

R **ON A/C 001-049, 101-149, 151-199, 211-299, 301-399, 401-499,
 A. Fire Extinguisher Bottle 11WF
 The primary components of the fire extinguisher bottle are:

 -
the container,

 -
the discharge outlet with the metal diaphragm,

 -
the fill fitting assembly with the pressure relief device,

 -
the pressure switch with a guard,

 -
the identification plate.
 The container is spherical, made of stainless steel and is hermetically
 sealed. The discharge outlet, the fill fitting assembly and the pressure
 switch are attached to the container.

 Fire Extinguishing - Flight Condition - Schematic
 Figure 002
 1EFF :  ALL  1  26-22-00 Page 5 
1  1  Feb 01/98
 1  1
 1CES  1

R  Automatic Extinguishing on Ground - Schematic Figure 003 (SHEET 1)
 1EFF : 1 1 1CES  ALL  1 111 26-22-00 Page 6 Nov 01/00

R  Automatic Extinguishing on Ground - Schematic Figure 003 (SHEET 2)
 1EFF : 1 1 1CES  ALL  1 111 26-22-00 Page 7 Nov 01/00

 The container is charged with the extinguisher agent and pressurized with nitrogen through the fill fitting assembly. The fill fitting assembly seals the container and has a stainless steel disc which functions as a pressure relief device. If the pressure in the container increases to 1680 psi (115.8319 bar) +120 psi (+8.2737 bar) -0 psi (-0.0000 bar) (equivelent to a temperature of 265 deg.F (129.44 deg.C) +20 deg.F (-6.66 deg.C)) the disc ruptures and releases the extinguisher agent. The container has a volume of 224 in.3 (3670.71 cm3). It is charged with
 5.00 lb (2.2679 kg) +0.10 lb (+0.0453 kg) -0 lb (-0.0000 kg) of extinguisher agent and pressurized to 600 psi (41.3685 bar) +25 psi (+1.7236 bar) -0 psi (-0.0000 bar). It can operate between the ambient temperatures of -65 deg.F (-53.88 deg.C) and +250 deg.F (+121.11 deg.C).
 The pressure switch monitors the pressure in the container. It has a guard for protection. If the pressure in the container decreases to 200 psi (13.7895 bar) +20 psi (+1.3789 bar) -20 psi (-1.3789 bar) the pressure switch closes and sends a signal to the APU FIRE panel 1WD.

R **ON A/C 051-099, 201-210,
 A. Fire Extinguisher Bottle 11WF
 The primary components of the fire extinguisher bottle are:

 -
the container,

 -
the discharge outlet with the metal diaphragm,

 -
the fill fitting assembly with the pressure relief device,

 -
the pressure switch with a guard,

 -
the identification plate. The container is spherical, made of stainless steel and is hermetically sealed. The discharge outlet, the fill fitting assembly and the pressure switch are attached to the container. The container is charged with the extinguisher agent and pressurized with nitrogen through the fill fitting assembly. The fill fitting assembly seals the container and has a stainless steel disc which functions as a pressure relief device. If the pressure in the container increases to 1825 psi (125.8293 bar) +200 psi (+13.7895 bar) -0 psi (-0.0000 bar) (equivelent to a temperature of 250 deg.F (121.11 deg.C)) the disc ruptures and releases the extinguisher agent. The container has a volume of 224 in.3 (3670.71 cm3). It is charged with

 5.00 lb (2.2679 kg) +0.10 lb (+0.0453 kg) -0 lb (-0.0000 kg) of extinguisher agent and pressurized to 600 psi (41.3685 bar) +25 psi (+1.7236 bar) -0 psi (-0.0000 bar). It can operate between the ambient temperatures of -65 deg.F (-53.88 deg.C) and +250 deg.F (+121.11 deg.C).
　
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