4. Power Supply
____________
The engine fire extinguishing system gets the electrical power from the DC
system of the aircraft.
A. Circuit Breakers
The system is supplied through these circuit breakers:
-------------------------------------------------------------------------------FIN PANEL/LOCATION DESIGNATION BUS ATA REF. -------------------------------------------------------------------------------1WE1 121VU Q43 ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A 701PP 26-21-00 2WE1 121VU Q44 ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B 702PP 26-21-00 1WE2 121VU Q41 ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A 202PP 26-21-00 2WE2 121VU Q42 ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B 202PP 26-21-00 -------------------------------------------------------------------------------
5. Interface_________ (Ref. Fig. 002)
The engine fire extinguishing system has an interface with the following
systems:
-Air Conditioning (PACKS) (Ref. 21-51-00),
-
Electrical Power: AC Main Generation (Ref. 24-22-00),
-
Electrical Power: DC Ancillary Equipment (Ref. 24-68-00),
-Engine LP Fuel shut off (Ref. 28-24-00),
-Green Main Hydraulic Power (Ref. 29-11-00),
-Yellow Main Hydraulic Power (Ref. 29-13-00),
-Flight Warning Computer (FWC) (Ref. 31-52-00),
-Annunciator Light Test and Dimming (Ref. 33-14-00),
-Engine Bleed Air Supply System (Ref. 36-11-00),
-Functional Interfaces (Ref. 73-25-00).
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ENG 1(2) FIRE Pushbutton Switch - Interface
Figure 002
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6. Component Description
_____________________
The fire extinguishing system comprises for each engine:
- on the ENG/APU FIRE panel (20VU):
. one ENG 1(2) FIRE pushbutton switch
. two SQUIB/DISCH (AGENT 1 and AGENT 2) pushbutton switches
. one TEST Pushbutton switch
-two fire extinguisher bottles located in the engine pylon
-
extinguishing lines routed in the pylon and leading to the nacelle.
A.
ENG/APU FIRE panel 1WD
(Ref. Fig. 003)
(1)
ENG 1(2) FIRE Pushbutton Switch
See Para. 5. Interface
(2)
SQUIB/DISCH Pushbutton Switch
Each SQUIB/DISCH (AGENT 1 and AGENT 2) pushbutton switch corresponds respectively to fire extinguisher bottle 1 and fire extinguisher bottle 2.
(a)
SQUIB legend The ENG 1(2) FIRE pushbutton switch arms the cartridge firing system. The SQUIB legend (white) comes on after this action.
(b)
DISCH legend The DISCH legend (amber) comes on when the pressure switch installed on the fire extinguisher bottle transmits a low pressure signal, which indicates the discharge or a leakage of the fire extinguisher bottle.
(3) TEST Pushbutton switch
See Para. 8. BITE/Test.
ENG/APU FIRE Panel (20VU)
Figure 003
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B. Fire Extinguisher Bottle
(Ref. Fig. 004)
The fire extinguisher bottle is of the high-rate discharge type and is made up of:
-
a spherical container/extinguishing agent
-
a discharge head
-
a cartridge.
R **ON A/C 001-049, 101-105, 201-210,
(1) Spherical container/extinguishing agent
(a)
Fire extinguishing agent
-type: Halon 1301 (bromotrifluoromethane, CF3 Br)
-quantity: 11 lb (5 kg)
-pressurized by nitrogen (N2), quantity 0.42 lb maximum
(0.19 kg).
(b)
Spherical container
-material: NITRONIC 40 CRES
-number of outlet ports: 1
-volume: 378 cubic inches (6194 cubic centimeters)
-filling pressure: 600 psi (+0/+25 psi) at 70 deg.F
(41.4 bars (+0/+1.8 bars) at 21 deg.C)
-Operating temperature: -54 deg.C to +96 deg.C (-65 deg.F to +205 deg.F).
On the spherical container there is:
. a pressure switch
. a filling fitting
. an outlet port and frangible disc.
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