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If required, both bottles can be discharged into one engine. The selection of the L or R ENG FIRE switch determines which squib is fired. Only bottle No. 2 can be discharged into the APU compartment.
Both fire extinguishers are installed outside the aircraft’s pressure bulkhead in the aft equipment bay. For the left and right engines, a check tee is placed at the intersection between the plumbing from the two bottles and the common plumbing going to the fire zone. The check tee prevents extinguishing agent from the second discharged bottle from back filling into the bottle that was discharged first.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
09-01-04 ENGINE FIRE DETECTION (Cont) FIREX CONTROL UNIT SCHEMATIC
ENGINE
L ENG FIRE
R ENG FIRE APU F RE
FIRE FIREFIRE
1 FIRE EXT 2
EVENT
AUTO APR ARMED ARMED
AUTO SYNC MACH HOLD
N1
OFF
OFF N2
L STARTER R STARTER
OFF OFF
IGNITION
CRANK START CRANK START
FIREX CONTROL
UNIT
CONTAINER #1 6 CONTAINER #2
L ENGINE 1 2 3 6 1 2 3 R ENGINE
APU 4 5
1-BLEED AIR VALVE 2-FUEL SHUTOFF VALVE 3- HYDRAULIC SHUTOFF VALVE 4- APU BLEED SHUTOFF VALVE 5- APU FUEL SHUTOFF VALVE 6- TWO WAY CHECK VALVE LEGEND ENGINE DISCHARGE
CFO0901002_011
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
09-01-05 ENGINE FIRE PROTECTION
L (R) ENG FIRE SWITCHES
When the ENG FIRE switch is pressed:
-Applicable (left or right) squib on both bottles are armed and both EXT 1 and EXT 2 switches illuminate ARMED -Fuel shutoff valve closes -Bleed-air shutoff valves closes -Hydraulic shutoff valve closes -Generator is selected offline -FADEC commands engine shutdown
FIRE EXT 1 (2) SWITCHES
When the FIRE EXT 1 or FIRE EXT 2 switch is pressed, electrical current fires the squib in the associated bottle and pres-surized Halon is directed into the engine fire zones. The selection of the L or R ENG FIRE switch determines which engine the bottles are discharged into the engine nacelle. During an engine fire, FIRE EXT 1 should always be depressed first, regardless of which engine has the fire. The APU compartment can only be extinguished by bottle No. 2. Therefore, if the fire is extinguished with the bottle No. 1, then bottle No. 2 remains for use on the other engine or the APU if needed.
After an extinguisher bottle is discharged, the ARMED light on the FIRE EXT switch extinguishes and the FIREX BTL 1
(2) LOW (A) CAS illuminates.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
09-01-06 ENGINE FIRE PROTECTION (Cont) FIREX BOTTLE PRESSURES
During checks on the FIREX bottles, the following pressure/temperature chart can be used to determine if bottle pressure is within acceptable limits for bottle temperature. The table provided applies to bottles with 4.3 lb agent.
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