DOC AIRBUS | AMM A320FENGINE FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
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:
** ON A/C NOT FOR ALL 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
Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL
Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL
Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL Fire Extinguisher Bottle - Component Location ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 5WE1 | CARTRIDGE-ENG1 FIRE EXTING BOTTLE 1 | 415BR | 415 | 26-21-41 | |
| 5WE2 | CARTRIDGE-ENG2 FIRE EXTING BOTTLE 1 | 425BR | 425 | 26-21-41 | |
| 7WE1 | CARTRIDGE-ENG1 FIRE EXTING BOTTLE 2 | 415BL | 415 | 26-21-41 | |
| 7WE2 | CARTRIDGE-ENG2 FIRE EXTING BOTTLE 2 | 425BL | 425 | 26-21-41 | |
| ** ON A/C NOT FOR ALL | |||||
| 6WE2 | BOTTLE 1-FIRE EXTING, ENG 2 | 425BR | 425 | 26-21-41 | |
| ** ON A/C ALL | |||||
| 6WE1 | BOTTLE 1-FIRE EXTING, ENG 1 | 415 | 26-21-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 6WE2 | BOTTLE 1-FIRE EXTING, ENG 2 | 425 | 26-21-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 8WE1 | BOTTLE 2-FIRE EXTING, ENG 1 | 415BL | 415 | 26-21-41 | |
| 8WE2 | BOTTLE 2-FIRE EXTING, ENG 2 | 425BL | 425 | 26-21-41 | |
| ** ON A/C NOT FOR ALL | |||||
| 8WE1 | BOTTLE 2-FIRE EXTING, ENG 1 | 415 | 26-21-41 | ||
| 8WE2 | BOTTLE 2-FIRE EXTING, ENG 2 | 425 | 26-21-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 1WM1 | DISCHARGE HEAD-FIRE EXTING BOTTLE 1, ENG 1 | 415BR | 415 | 26-21-41 | |
| 1WM2 | DISCHARGE HEAD-FIRE EXTING BOTTLE 1, ENG 2 | 425BR | 425 | 26-21-41 | |
| ** ON A/C NOT FOR ALL | |||||
| 1WM1 | DISCHARGE HEAD-FIRE EXTING BOTTLE 1, ENG 1 | 415 | 26-21-41 | ||
| 1WM2 | DISCHARGE HEAD-FIRE EXTING BOTTLE 1, ENG 2 | 425 | 26-21-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 2WM1 | DISCHARGE HEAD-FIRE EXTING BOTTLE 2, ENG 1 | 415BR | 415 | 26-21-41 | |
| 2WM2 | DISCHARGE HEAD-FIRE EXTING BOTTLE 2, ENG 2 | 425BR | 425 | 26-21-41 | |
| ** ON A/C NOT FOR ALL | |||||
| 2WM1 | DISCHARGE HEAD-FIRE EXTING BOTTLE 2, ENG 1 | 415 | 26-21-41 | ||
| 2WM2 | DISCHARGE HEAD-FIRE EXTING BOTTLE 2, ENG 2 | 425 | 26-21-41 | ||
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.
Thirty seconds later (after the first bottle discharged), if the fire is still present, the pilot fires the second bottle.
The fire extinguishing procedure is given by the ECAM display unit.
For each engine, two fire extinguisher bottles contain fire extinguishing agent.
The fire extinguisher bottles, installed in the aft section of the engine pylon, are connected to the extinguishing system. This system is routed in the pylon and go 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 (on the ENG/APU FIRE panel (1WD)) is already pushed.
During the extinguishing procedure, the extinguishing agent flows in the piping and is immediately sprayed in the engine core compartment.
Thirty seconds after the first bottle discharge, if the fire is not extinguished, the pilot discharges the second bottle.
The ECAM display unit gives the fire extinguishing procedure.
** ON A/C NOT FOR ALL 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.
Thirty seconds later (after the first bottle discharged), if the fire is still present, the pilot fires the second bottle.
The fire extinguishing procedure is given by the ECAM display unit.
For each engine, two fire extinguisher bottles contain fire extinguishing agent.
The fire extinguisher bottles, installed in the aft section of the engine pylon, are connected to the extinguishing system. This system is routed in the pylon and go 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 (on the ENG/APU FIRE panel (1WD)) is already pushed.
During the extinguishing procedure, the extinguishing agent flows in the piping and is immediately sprayed in the engine core compartment.
Thirty seconds after the first bottle discharge, if the fire is not extinguished, the pilot discharges the second bottle.
The ECAM display unit gives the fire extinguishing procedure.
4. Power Supply
The engine fire extinguishing system gets the electrical power from the DC system of the aircraft.
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:
The system is supplied through these 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 |
| ------------------------------------------------------------------------------- |
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/BTL2/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/BTL1/SQUIB/B 202PP 26-21-00 |
| ------------------------------------------------------------------------------- |
5. Interface
The engine fire extinguishing system has an interface with the following systems:
** ON A/C NOT FOR ALL The engine fire extinguishing system has an interface with the following systems:
- Air Conditioning (PACKS) (Ref. AMM D/O 21-51-00-00),
- Electrical Power: AC Main Generation (Ref. AMM D/O 24-22-00-00),
- Electrical Power: DC Ancillary Equipment (Ref. 24-68-00),
- Engine LP Fuel shut off (Ref. AMM D/O 28-24-00-00),
- Green Main Hydraulic Power (Ref. AMM D/O 29-11-00-00),
- Yellow Main Hydraulic Power (Ref. AMM D/O 29-13-00-00),
- Flight Warning Computer (FWC) (Ref. AMM D/O 31-52-00-00),
- Annunciator Light Test and Dimming (Ref. AMM D/O 33-14-00-00),
- Engine Bleed Air Supply System (Ref. AMM D/O 36-11-00-00),
- Functional Interfaces (Ref. AMM D/O 73-25-00-00).
6. Component Description
The fire extinguishing system comprises for each engine:
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.
(1) ENG 1(2) FIRE Pushbutton Switch
See Para. 5. Interface
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.
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.
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.
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.
See Para. 8. BITE/Test.
B. Fire Extinguisher Bottle FIN: 6-WE-1 FIN: 6-WE-2 FIN: 8-WE-1 FIN: 8-WE-2
The fire extinguisher bottle is of the high-rate discharge type and is made up of:
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.
(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 0.40 lb maximum
(0.18 kg).
(b) Spherical container
On the spherical container there is:
. a pressure switch
. a filling fitting with a stainless steel disc
. an outlet port and frangible disc.
The outlet port is located in the lower section of the container. The pressure switch and filling fitting are screwed and welded.
- 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 with a stainless steel disc
. an outlet port and frangible disc.
The outlet port is located in the lower section of the container. The pressure switch and filling fitting are screwed and welded.
1 Pressure switch
The pressure switch senses a signal when the bottle is discharged or has a leakage.
It is calibrated to 275/450 psi (19/31 bars) increasing pressure (filling) and to 225/275 psi (15.6/19 bars) decreasing pressure (discharge or leakage).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch fitted on the fire extinguisher bottle.
The pressure switch senses a signal when the bottle is discharged or has a leakage.
It is calibrated to 275/450 psi (19/31 bars) increasing pressure (filling) and to 225/275 psi (15.6/19 bars) decreasing pressure (discharge or leakage).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch fitted on the fire extinguisher bottle.
2 Filling fitting
You can fill the fire extinguisher bottle through the filling fitting assembly.
The filling fitting incorporates a stainless steel disc. It acts as a primary safety relief device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1600 and 1800 psi. This corresponds to a temperature of 205 deg.F approximately (110 to 124 bars for 95 deg.C approximately).
You can fill the fire extinguisher bottle through the filling fitting assembly.
The filling fitting incorporates a stainless steel disc. It acts as a primary safety relief device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1600 and 1800 psi. This corresponds to a temperature of 205 deg.F approximately (110 to 124 bars for 95 deg.C approximately).
3 Frangible disc
Firing of the cartridge causes rupture of the frangible disc (calibrated metallic diaphragm) installed on the outlet port.
The fire extinguishing agent is then discharged via the discharge head in the fire-extinguishing distribution system.
The frangible disc also functions as an overpressure device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1600 and 1800 psi. This corresponds to a temperature of 205 deg.F approximately
(110 to 124 bars for 95 deg.C approximately).
Firing of the cartridge causes rupture of the frangible disc (calibrated metallic diaphragm) installed on the outlet port.
The fire extinguishing agent is then discharged via the discharge head in the fire-extinguishing distribution system.
The frangible disc also functions as an overpressure device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1600 and 1800 psi. This corresponds to a temperature of 205 deg.F approximately
(110 to 124 bars for 95 deg.C approximately).
(2) 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
On the spherical container there is:
. a pressure switch
. a filling fitting
. an outlet port and frangible disc.
The outlet port is located in the lower section of the container. The pressure switch and filling fitting are screwed and welded.
- 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.
The outlet port is located in the lower section of the container. The pressure switch and filling fitting are screwed and welded.
1 Pressure switch
The pressure switch senses a signal when the bottle is discharged or has a leakage.
It is calibrated to 275/450 psi (19/31 bars) increasing pressure (filling) and to 225/275 psi (15.6/19 bars) decreasing pressure (discharge or leakage).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch fitted on the fire extinguisher bottle.
The pressure switch senses a signal when the bottle is discharged or has a leakage.
It is calibrated to 275/450 psi (19/31 bars) increasing pressure (filling) and to 225/275 psi (15.6/19 bars) decreasing pressure (discharge or leakage).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch fitted on the fire extinguisher bottle.
2 Filling fitting
You can fill the fire extinguisher bottle through the filling fitting assembly.
You can fill the fire extinguisher bottle through the filling fitting assembly.
3 Frangible disc
Firing of the cartridge causes rupture of the frangible disc (calibrated metallic diaphragm) installed on the outlet port.
The fire extinguishing agent is then discharged via the discharge head in the fire-extinguishing distribution system.
The frangible disc also functions as an overpressure device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1710 and 1910 psi. This corresponds to a temperature of 205 deg.F approximately (118 to 131 bars for 96 deg.C approximately).
Firing of the cartridge causes rupture of the frangible disc (calibrated metallic diaphragm) installed on the outlet port.
The fire extinguishing agent is then discharged via the discharge head in the fire-extinguishing distribution system.
The frangible disc also functions as an overpressure device in case of excessive pressure in the fire extinguisher bottle, i.e. between 1710 and 1910 psi. This corresponds to a temperature of 205 deg.F approximately (118 to 131 bars for 96 deg.C approximately).
(3) Spherical container/extinguishing agent
(a) Fire extinguishing agent
- Type: halon 1301 (bromotrifluoromethane, CF3 Br)
- Pressurized with nitrogen (N2), maximum quantity 0.25 lb
(0.11 kg).
(b) Spherical container
On the spherical container, there is:
. A pressure switch
. A filling fitting
. An outlet port and rupture disc.
The outlet port is in the lower section of the container. The pressure switch and filling fitting are attached with screws and welded.
- Material: stainless steel
- Number of outlet ports: 1
- Volume: 224 cubic inches (3671 cubic centimeters)
- Filling pressure: 600 psi (-0/+25 psi) at 70 deg.F
(41.4 bars (-0/+1.72 bars) at 21 deg.C) - Operating temperature: from -55 deg.C to +95 deg.C (from -67 deg.F to +203 deg.F).
On the spherical container, there is:
. A pressure switch
. A filling fitting
. An outlet port and rupture disc.
The outlet port is in the lower section of the container. The pressure switch and filling fitting are attached with screws and welded.
1 Pressure switch
The pressure switch senses a signal when the bottle is discharged or has a leak.
It is calibrated to 300/500 psi (20.7/34.5 bars) decreasing pressure (discharge or leak).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch installed on the fire extinguisher bottle.
The pressure switch senses a signal when the bottle is discharged or has a leak.
It is calibrated to 300/500 psi (20.7/34.5 bars) decreasing pressure (discharge or leak).
The pressure switch is electrically connected to the ENG/APU FIRE panel which generates a discharge signal to the DISCH light (panel 255VU).
You can manually test the pressure switch installed on the fire extinguisher bottle.
2 Filling fitting
You can fill the fire extinguisher bottle through the filling fitting assembly.
The filling fitting has a stainless steel disc that is the secondary safety relief-device.
You can fill the fire extinguisher bottle through the filling fitting assembly.
The filling fitting has a stainless steel disc that is the secondary safety relief-device.
3 Rupture disc
The rupture disc (calibrated metal diaphragm) opens because of the detonation wave when the cartridge, installed on the outlet port, is fired.
The fire extinguishing agent is then discharged through the discharge head in the fire-extinguishing distribution system.
The rupture disc is the primary safety relief port. The rupture disc bursts when the pressure is more than a value between 1700 and 2000 psi. This is related to a temperature of 203 deg.F approximately (118 to 138 bars for 95 deg.C approximately).
The rupture disc (calibrated metal diaphragm) opens because of the detonation wave when the cartridge, installed on the outlet port, is fired.
The fire extinguishing agent is then discharged through the discharge head in the fire-extinguishing distribution system.
The rupture disc is the primary safety relief port. The rupture disc bursts when the pressure is more than a value between 1700 and 2000 psi. This is related to a temperature of 203 deg.F approximately (118 to 138 bars for 95 deg.C approximately).
(4) Discharge head
The discharge head can be oriented around its axis (rotatable through 360 deg.). Its position depends on whether it is installed on bottle 1 or 2.
The cartridge is installed on the discharge head. The percussion breaks up the frangible disc and all the fire extinguishing agent is thus freed.
A strainer retains the fragments from the diaphragm.
The discharge head can be oriented around its axis (rotatable through 360 deg.). Its position depends on whether it is installed on bottle 1 or 2.
The cartridge is installed on the discharge head. The percussion breaks up the frangible disc and all the fire extinguishing agent is thus freed.
A strainer retains the fragments from the diaphragm.
(5) Discharge head
The discharge head can be turned around its axis (360 deg.). Its position is different on bottles 1 and 2.
The cartridge is installed on the discharge head. The percussion breaks the rupture disc and all the fire extinguishing agent is thus released.
A strainer retains the fragments from the diaphragm.
The discharge head can be turned around its axis (360 deg.). Its position is different on bottles 1 and 2.
The cartridge is installed on the discharge head. The percussion breaks the rupture disc and all the fire extinguishing agent is thus released.
A strainer retains the fragments from the diaphragm.
(6) Cartridge
The electro-pyrotechnic cartridge contains 400 mg of explosive powder. The powder is fired by two filaments supplied with 28VDC.
Each filament is connected to a ground wire and can supply the electrical power necessary to the firing if the other filament fails.
This design ensures redundancy of the fire extinguisher bottle percussion system.
The firing current is approximately 5A.
The electro-pyrotechnic cartridge contains 400 mg of explosive powder. The powder is fired by two filaments supplied with 28VDC.
Each filament is connected to a ground wire and can supply the electrical power necessary to the firing if the other filament fails.
This design ensures redundancy of the fire extinguisher bottle percussion system.
The firing current is approximately 5A.
(7) Cartridge
The electro-pyrotechnic cartridge contains 400 mg of explosive powder. Two filaments supplied with 28 VDC fire the powder.
Each filament is connected to a ground wire and can supply the electrical power necessary to the firing if the other filament fails.
This supplies the redundancy of the fire-extinguisher bottle percussion-system.
The firing current is approximately 3.5A.
The electro-pyrotechnic cartridge contains 400 mg of explosive powder. Two filaments supplied with 28 VDC fire the powder.
Each filament is connected to a ground wire and can supply the electrical power necessary to the firing if the other filament fails.
This supplies the redundancy of the fire-extinguisher bottle percussion-system.
The firing current is approximately 3.5A.
C. Fire-Extinguishing Distribution System
Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL
Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL
Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL
The distribution system for each engine comprises:
From rib 1 the line is divided into two segments directed to the engine core and fan compartments.
The distribution system for each engine includes:
At rib 1, the line divides into two segments that go to the engine core.
Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL Fire Extinguishing System - Distribution ** ON A/C NOT FOR ALL The distribution system for each engine comprises:
- two fire extinguisher bottles
- rigid lines
- nozzles.
From rib 1 the line is divided into two segments directed to the engine core and fan compartments.
The distribution system for each engine includes:
- Two fire extinguisher bottles
- Rigid and flexible lines
- Nozzles.
At rib 1, the line divides into two segments that go to the engine core.
(1) Core compartment
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line are:
The end of the fire extinguishing line which is above the combustion chamber, has a two-oulet nozzle.
This two-outlet nozzle sprays the core compartment.
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line are:
- dia.: 0.625 in. (15.8 mm),
- thickness: 0.032 in. (0.813 mm).
The end of the fire extinguishing line which is above the combustion chamber, has a two-oulet nozzle.
This two-outlet nozzle sprays the core compartment.
(2) Core compartment
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line are:
The end of the fire extinguishing line which is above the combustion chamber, has a three-oulet nozzle: two symmetrical jets and the end itself is blanked with a metal disc pierced in its center with a hole (see view C).
This three-outlet nozzle sprays the core compartment.
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line are:
- dia.: 0.625 in. (15.8 mm),
- thickness: 0.032 in. (0.813 mm).
The end of the fire extinguishing line which is above the combustion chamber, has a three-oulet nozzle: two symmetrical jets and the end itself is blanked with a metal disc pierced in its center with a hole (see view C).
This three-outlet nozzle sprays the core compartment.
(3) Core compartment
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line is:
The end of the fire extinguishing line which is above the combustion chamber, has a two-oulet nozzle.
This two-outlet nozzle sprays the core compartment.
From rib 1, the core segment is routed between the two lower arms of the pyramid that hold the engine forward mount.
The dimensions of the line is:
- dia.: 0.625 in. (15.8 mm),
- thickness: 0.032 in. (0.813 mm).
The end of the fire extinguishing line which is above the combustion chamber, has a two-oulet nozzle.
This two-outlet nozzle sprays the core compartment.
(4) Core compartment
The dimensions of the line are:
The main pipe is connected to the two bottles. For a satisfactory supply of the agent, the three nozzles of the main pipe spray the core compartment in different directions.
The dimensions of the line are:
- The diameter: 1 in. (25.4 mm)
- The thickness: 0.052 in. (1.32 mm).
The main pipe is connected to the two bottles. For a satisfactory supply of the agent, the three nozzles of the main pipe spray the core compartment in different directions.
(5) Fan compartment
From rib 1, the fan segment is routed down to the gearbox (fan lower section).
The dimensions of the line is:
The end of the fire extinguishing line in the fan lower section, has a three-outlet nozzle.
This three-outlet nozzle sprays the fan compartment.
From rib 1, the fan segment is routed down to the gearbox (fan lower section).
The dimensions of the line is:
- dia.: 0.75 in. (19 mm),
- thickness: 0.04 in. (1.016 mm).
The end of the fire extinguishing line in the fan lower section, has a three-outlet nozzle.
This three-outlet nozzle sprays the fan compartment.
(6) Fan compartment
From rib 1, the fan segment is routed below the upper spar of the engine pylon up to the upper section of the fan frame.
The dimensions of the line are:
The fire extinguishing line has two symmetrical nozzles at rib 03.
From rib 02, the line is divided into two symmetrical segments, each ending with a nozzle at rib 01.
All 4 nozzles spray the fan compartment.
From rib 1, the fan segment is routed below the upper spar of the engine pylon up to the upper section of the fan frame.
The dimensions of the line are:
- dia.: 0.75 in. (19 mm),
- thickness: 0.04 in. (1.016 mm).
The fire extinguishing line has two symmetrical nozzles at rib 03.
From rib 02, the line is divided into two symmetrical segments, each ending with a nozzle at rib 01.
All 4 nozzles spray the fan compartment.
(7) Fan compartment
From rib 1, the fan segment is routed below the upper spar of the engine pylon up to the upper section of the fan frame.
The dimensions of the line is:
The end of the fire extinguishing line has a four-outlet nozzle.
This four-outlet nozzle sprays the fan compartment.
From rib 1, the fan segment is routed below the upper spar of the engine pylon up to the upper section of the fan frame.
The dimensions of the line is:
- dia.: 0.75 in. (19 mm),
- thickness: 0.04 in. (1.016 mm).
The end of the fire extinguishing line has a four-outlet nozzle.
This four-outlet nozzle sprays the fan compartment.
7. Operation/Control and Indicating
A. Operation of the Fire Extinguishing System
The FIRE warning signals generated by the fire detection unit (FDU) are transmitted to the cockpit, at the following locations:
The Continuous Repetitive Chime (CRC) sounds.
When you push the ENG 1(2) FIRE pushbutton switch, you arm the cartridge firing system. The SQUIB legend (white) comes on after this action. At the same time the engine is isolated and the CRC is stopped.
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.
The DISCH legend (amber) comes on when the fire extinguisher bottle is completely discharged.
Thirty seconds later (after the first bottle disharged), if the fire is still present, the pilot fires the second bottle.
The FIRE warning signals from the Fire Detection Unit (FDU) are transmitted to the cockpit, to:
The Continuous Repetitive Chime (CRC) sounds.
When you push the ENG 1(2) FIRE pushbutton switch, you arm the cartridge firing system. The SQUIB legend (white) comes on. At the same time the engine is isolated and the CRC stops.
During the extinguishing procedure, the extinguishing agent flows in the rigid pipes and is immediately sprayed in the engine core compartment.
The DISCH legend (amber) comes on when the fire extinguisher bottle is fully discharged.
After thirty seconds (when the first bottle is discharged), if the fire is not extinguished, the pilot fires the second bottle.
The FIRE warning signals generated by the fire detection unit (FDU) are transmitted to the cockpit, at the following locations:
- ENG/APU FIRE panel (1WD): ENG 1(2) FIRE pushbutton switch
- ENG MASTER control panel (115VU): ENG/FIRE/FAULT annunciator
- MASTER WARN light
- ECAM: ENG 1(2) FIRE and fire extinguishing procedure
- SD: engine page.
The Continuous Repetitive Chime (CRC) sounds.
When you push the ENG 1(2) FIRE pushbutton switch, you arm the cartridge firing system. The SQUIB legend (white) comes on after this action. At the same time the engine is isolated and the CRC is stopped.
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.
The DISCH legend (amber) comes on when the fire extinguisher bottle is completely discharged.
NOTE: The ENG 1(2) FIRE pushbutton switch is come on as long as the FIRE warning is generated by the fire detection unit (FDU).
Thirty seconds later (after the first bottle disharged), if the fire is still present, the pilot fires the second bottle.
The FIRE warning signals from the Fire Detection Unit (FDU) are transmitted to the cockpit, to:
- ENG/APU FIRE panel (1WD): ENG 1(2) FIRE pushbutton switch
- ENG MASTER control panel (115VU): ENG/FIRE/FAULT annunciator
- MASTER WARN light
- ECAM: ENG 1(2) FIRE and fire extinguishing procedure
- SD: engine page.
The Continuous Repetitive Chime (CRC) sounds.
When you push the ENG 1(2) FIRE pushbutton switch, you arm the cartridge firing system. The SQUIB legend (white) comes on. At the same time the engine is isolated and the CRC stops.
During the extinguishing procedure, the extinguishing agent flows in the rigid pipes and is immediately sprayed in the engine core compartment.
The DISCH legend (amber) comes on when the fire extinguisher bottle is fully discharged.
NOTE: The ENG 1(2) FIRE pushbutton switch stays on until the Fire Detection Unit (FDU) no longer sends the FIRE warning.
After thirty seconds (when the first bottle is discharged), if the fire is not extinguished, the pilot fires the second bottle.
B. Fire Extinguishing Procedure
The list of actions to be done during the fire extinguishing procedure comes into view automatically on the ECAM display unit at the same time as the FIRE warnings.
As soon as the required actions are done, the corresponding line is cancelled automatically on the ECAM display unit.
The following procedure must be applied:
The list of actions to be done during the fire extinguishing procedure comes into view automatically on the ECAM display unit at the same time as the FIRE warnings.
As soon as the required actions are done, the corresponding line is cancelled automatically on the ECAM display unit.
The following procedure must be applied:
| ------------------------------------------------------------------------------- |
| DISPLAY ACTIONS |
| ------------------------------------------------------------------------------- |
| - ENG 1 FIRE LAND ASAP |
| (2) |
| - THR LEVER 1.........IDLE . Throttle control lever in the Idle position |
| (2) |
| - ENG MASTER 1.........OFF . ENG/MASTER switch in the OFF position, which: |
| (2) - closes the HP and LP fuel shut off valves |
| and consequently shut down the engine. |
| - ENG 1 FIRE P/B......PUSH . Push the ENG/FIRE pushbutton switch, which: |
| (2) - closes the engine bleed air system |
| - confirms the closure of the LP fuel |
| shut off valve |
| - de-energizes the IDG |
| - closes the hydraulic shuts off valve |
| - lights on the SQUIB legends associated to |
| two fire extinguisher bottles |
| (AGENT 1 and 2) |
| - stops the Aural Warning: |
| the Continuous Repetitive Chime (CRC) |
| - AGENT 1 AFT 10 S...DISCH . Wait 10 seconds: this is the time required |
| for the engine to reach the windmilling |
| * Count down from 10 S to rate in flight. At this rating the |
| 0 S. The line disappears efficiency of the fire extinguishing |
| at 0 S. procedure is optimum. |
| - AGENT 1............DISCH . Squib the fire extinguisher bottle 1 by |
| pushing the AGENT 1 pushbutton switch. |
| * This line appears at The amber DISCH legend comes on when the |
| the end of the countdown. engine fire extinguisher bottle is |
| completely discharged. |
| - ATC...............NOTIFY . A distress signal is received by the |
| air controllers through the Air Traffic |
| Control (ATC) system. It provides |
| identification and altitude of the |
| aircraft. This enables quicker handling of |
| the air traffic and improves safety. |
| - IF FIRE AFTER 30 S: . If the FIRE legend is still on after |
| AGENT 2............DISH 30 seconds, the second fire extinguisher |
| bottle is fired (AGENT 2). |
| * Count down from 30 S to |
| 0 S. Line disappears |
| when count down to 0 S. |
8. BITE Test
A. Operational Test
The operational test enables the pilot to monitor and activate the fire protection system. This test is part of the daily check-list and is available each time it is needed, on the ground or in flight.
You can do the operational test of the fire extinguishing system by pushing the TEST pushbutton switch (one per engine) located on the ENG/APU FIRE panel.
The ENG/APU FIRE panel (1WD) provides the test logics and ensures the electrical continuity of:
When you press the TEST pushbutton switch, the FIRE warning indications are triggered and you check the condition of the fire extinguishing system:
If the failure is detected during the test sequence, a fault message comes into view in the ECAM (For example ENG 1 (2) LOOP A(B) FAULT).
Through the operational test, the pilot can monitor and operate the fire protection system. This test is part of the daily check-list and available when necessary, on the ground or in flight.
When you want to do the operational test of the fire extinguishing system, you must push the TEST pushbutton switch (one for each engine) installed on the ENG/APU FIRE panel.
The ENG/APU FIRE panel (1WD) supplies the test logics and the electrical continuity of:
When you press the TEST pushbutton switch, the FIRE warning indications are triggered and you can do a check of the condition of the fire extinguishing system:
If the failure is detected during the test sequence, a fault message comes into view on the ECAM DU (for example, ENG 1 (2) LOOP A(B) FAULT).
The operational test enables the pilot to monitor and activate the fire protection system. This test is part of the daily check-list and is available each time it is needed, on the ground or in flight.
You can do the operational test of the fire extinguishing system by pushing the TEST pushbutton switch (one per engine) located on the ENG/APU FIRE panel.
NOTE: The TEST pushbutton switch must be held during the whole test duration. The response time of the test is lower than 1 second.
The ENG/APU FIRE panel (1WD) provides the test logics and ensures the electrical continuity of:
- the firing circuitry of the fire extinguisher bottle
- the low pressure warning circuitry of the fire extinguisher bottle.
When you press the TEST pushbutton switch, the FIRE warning indications are triggered and you check the condition of the fire extinguishing system:
- on the AGENT 1 and AGENT 2 pushbutton switches:
. lighting of the SQUIB legend,
(only if the two filaments are normally power supplied)
. lighting of the amber DISCH legend, (checking of the lamps only). - electrical supply of the two filaments of each cartridge
NOTE: Although only one filament is sufficient to enable the firing of the cartridge, the test will be positive only if the two filaments are electrically supplied. The test current is limited to 80 mA by the test module whereas the firing current is 5A.
If the failure is detected during the test sequence, a fault message comes into view in the ECAM (For example ENG 1 (2) LOOP A(B) FAULT).
Through the operational test, the pilot can monitor and operate the fire protection system. This test is part of the daily check-list and available when necessary, on the ground or in flight.
When you want to do the operational test of the fire extinguishing system, you must push the TEST pushbutton switch (one for each engine) installed on the ENG/APU FIRE panel.
NOTE: It is necessary to hold the TEST pushbutton switch until the test is completed. The response time of the test is less than 1 second.
The ENG/APU FIRE panel (1WD) supplies the test logics and the electrical continuity of:
- The firing circuitry of the fire extinguisher bottle
- The low-pressure warning circuitry of the fire extinguisher bottle.
When you press the TEST pushbutton switch, the FIRE warning indications are triggered and you can do a check of the condition of the fire extinguishing system:
- On the AGENT 1 and AGENT 2 pushbutton switches:
. The SQUIB legend illuminates
(only if the two filaments are normally power-supplied)
. The amber DISCH legend illuminates (check of the lamps only). - The electrical supply of the two filaments of each cartridge.
NOTE: Although only one filament is sufficient to do the firing of the cartridge, the test will be correct only if the two filaments are electrically supplied. The test current is limited to 80 mA by the test module. The firing current is 3.5 A.
If the failure is detected during the test sequence, a fault message comes into view on the ECAM DU (for example, ENG 1 (2) LOOP A(B) FAULT).
B. Built-In Test Equipment (BITE)
This function is specified in the ATA chapter 26-12-00 (Para. 8. BITE/Test).
This function is specified in the ATA chapter 26-12-00 (Para. 8. BITE/Test).
C. Test of the Pressure Switch
Pressure Switch of the Fire Extinguisher Bottle ** ON A/C NOT FOR ALL
Pressure Switch of the Fire Extinguisher Bottle ** ON A/C NOT FOR ALL
The pressure switch on the fire extinguisher bottle has a manual test device. An hexagonal wrench is required to do the test.
The manual test checks the condition of the electrical contact. Rotation of the test screw opens the contact (continuity between pins 1 and 3): the DISCH legend on the AGENT 1(2) comes on.
In the rest position, the DISCH legend goes off.
Pressure Switch of the Fire Extinguisher Bottle ** ON A/C NOT FOR ALL Pressure Switch of the Fire Extinguisher Bottle ** ON A/C NOT FOR ALL The pressure switch on the fire extinguisher bottle has a manual test device. An hexagonal wrench is required to do the test.
The manual test checks the condition of the electrical contact. Rotation of the test screw opens the contact (continuity between pins 1 and 3): the DISCH legend on the AGENT 1(2) comes on.
In the rest position, the DISCH legend goes off.
NOTE: P > minimum pressure = continuity between pins 2 and 3
P < minimum pressure = continuity between pins 1 and 3.
P < minimum pressure = continuity between pins 1 and 3.