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1. General_______
A. Definition
There are several different fire extinguishing methods. The methods depend on:
-the area in which the fire occurs,
-whether the aircraft is in flight or on the ground.
The fire extinguishing systems are either fixed extinguishing bottle(s)
or portable fire extinguisher(s).
The fixed extinguishing bottle(s) are operated either automatically and
manually and portable fire extinguishers are operated manually.
2. System Description__________________
A. Fixed Fire-Extinguishing Bottles
The function of the fixed fire-extinguishing bottle(s) installed on board is to extinguish fire occurring in the following areas:
(1) Engine There is a fire extinguishing system in each nacelle. The system is supplied by two bottles. The percussion of the bottles is controlled from the cockpit.
The engine nacelle fire extinguishing system is detailed in ATA
chapter 26-21-00.
(2) APU The APU fire extinguishing system is supplied by one bottle. The percussion of the bottle on the ground can be controlled manually or automatically. In flight, the percussion is manually activated from the cockpit.
The APU fire extinguishing system is detailed in ATA chapter 26-22-00.
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R **ON A/C 004-049, 051-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(3) Cargo Compartment The cargo compartment fire extinguishing system is supplied by one bottle. The extinguishing agent can be sprayed in the cargo compartment. The percussion of the bottle is controlled from the cockpit.
The cargo compartment fire extinguishing system is detailed in ATA
chapter 26-23-00.
**ON A/C ALL
(4) Lavatories A bottle located above the waste bin can extinguish a fire in the lavatory waste bin.
The lavatory fire extinguishing system is detailed in ATA chapter
26-25-00.
B. Portable Equipment
The portable extinguishers are operated manually and are used if there is a fire in the cockpit or the cabin.
The portable extinguishers are detailed in ATA chapter 26-24-00.
ENGINE FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
_____________________________________________________
1. General_______
The fire extinguishing system is activated when fire is detected by the fire and overheat detection system (Ref. ATA 26-12-00).
The system has two main functions:
-
to extinguish at its early stage any fire occurring in the nacelle
protected zones.
-
to prevent engine fire from spreading: the engine is isolated from the rest of the aircraft ; the various supplies such as hot air, fuel, hydraulics, electrical power are closed for the purpose.
2. Component Location__________________ (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------5WE1 CARTRIDGE-ENG1 FIRE EXTING BOTTLE 1 415 415BR 26-21-41 5WE2 CARTRIDGE-ENG2 FIRE EXTING BOTTLE 1 425 425BR 26-21-41 7WE1 CARTRIDGE-ENG1 FIRE EXTING BOTTLE 2 415 415BL 26-21-41 7WE2 CARTRIDGE-ENG2 FIRE EXTING BOTTLE 2 425 425BL 26-21-41 6WE1 BOTTLE 1-FIRE EXTING, ENG 1 415 415BR 26-21-41 6WE2 BOTTLE 1-FIRE EXTING, ENG 2 425 425BR 26-21-41 8WE1 BOTTLE 2-FIRE EXTING, ENG 1 415 415BL 26-21-41 8WE2 BOTTLE 2-FIRE EXTING, ENG 2 425 425BL 26-21-41 1WM1 DISCHARGE HEAD-FIRE EXTING BOTTLE 1, 415 415BR 26-21-41 ENG 1 1WM2 DISCHARGE HEAD-FIRE EXTING BOTTLE 1, 425 425BR 26-21-41 ENG 2 2WM1 DISCHARGE HEAD-FIRE EXTING BOTTLE 2, 415 415BR 26-21-41 ENG 1 2WM2 DISCHARGE HEAD-FIRE EXTING BOTTLE 2, 425 425BR 26-21-41 ENG 2
Fire Extinguisher Bottle - Component Location
Figure 001
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3. System Description
__________________
For each engine, two fire extinguisher bottles contain fire extinguishing agent.
The fire extinguisher bottles located in the aft section of the engine pylon are connected to the extinguishing system. This system is routed in the pylon and leading to the nacelle.
The fire extinguisher bottles are controlled from the cockpit. Their firing is possible only if the ENG 1(2) FIRE pushbutton switch (located on the ENG/APU FIRE panel (1WD) is already pushed in.
During the extinguishing procedure, the extinguishing agent flows in the rigid pipes and is immediately sprayed in the engine protected zones: fan and core compartments.
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