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same decrease in resistance within a preset time, the control unit sends a fire signal to the EICAS. Each individual control
circuit and its related sensing loop is monitored. If one loop malfunctions, the second loop can still detect a fire.
FIRE EXTINGUISHER BOTTLES
Two fire extinguisher bottles are installed in the aft equipment bay. Each are equipped with a pressure switch, pressure
gauge, two discharge heads on the number 1 bottle, and three discharge heads on the number 2 bottle. Each squib has two
firing bridgewires fed by separate electrical circuits and are installed on each fire bottle. The bottles are filled with Halon
1301.
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.
FIRE PROTECTION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 09-01-05
ENGINE FIRE DETECTION (Cont)
FIREX CONTROL UNIT SCHEMATIC
CFO0901002_011
LEGEND
ENGINE DISCHARGE
ENGINE
1 2
IGNITION
MACH HOLD
L STARTER R STARTER
OFF OFF
FIRE EXT
CRANK START CRANK START
OFF N2
N1
SYNC
EVENT
FIRE
R ENG FIRE
ARMED ARMED
AUTO
FIRE FIRE
L ENG FIRE
APU FIRE
AUTO APR
APU
OFF
1
2
3
4
5
6
1
2
3
6
L
ENGINE
R
ENGINE
FIREX CONTROL
UNIT
CONTAINER
#1
CONTAINER
#2
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
FIRE PROTECTION
Volume 2 Flight Crew Operating Manual Sep 13/2004
09-01-06 CSP 100-6 REV 1
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 pressurized
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.
ENGINE
L ENG FIRE
FIRE FIRE
2
ARMED
1
ARMED
APU FIRE
OFF ON
FIRE EXT
IGNITION
SYNC MACH HOLD
N1
OFF N2
EVENT
ON
AUTO APR
OFF
R STARTER
CRANK START
OFF
CRANK START
L STARTER
R ENG FIRE
FIRE
AUTO
FIRE PROTECTION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 09-01-07
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.
Minimum/Maximum FIREX Bottle Pressure (4.3 lb nominal weight)
Gage reading (psig)
Temp °C Minimum Maximum
-55 251 343
-50 277 354
-45 288 367
-40 302 380
-35 315 394
-30 330 410
-25 347 427
-20 365 445
-15 384 465
-10 404 486
-5 427 508
0 450 533
5 476 559
10 503 587
15 532 616
20 578 648
25 596 681
30 631 717
35 668 755
40 708 795
45 750 838
50 796 886
55 849 941
60 895 982
65 964 1096
70 1032 1165
75 1100 1235
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