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118
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118
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AB
V
25
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5 DCU 6
LEFT GEAR FIREX CONTROL UNIT 4 RIGHT GEAR
AFFECTED AFFECTED
AREA AREA
AFFECTED 7 8 AFFECTED
AREA 9 10 AREA
11
APU COMPARTMENT
LH ENGINE RH ENGINE
CFO0901002_002
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
09-01-03 ENGINE FIRE DETECTION
DESCRIPTION
The engine fire detection system functions by detecting an overheat condition on the exterior of the engine.
If a fire is detected in the engine, the affected L or R ENG FIRE switch illuminates along with the master warning light, the master warning chimes, a L or R ENGINE FIRE (W) CAS message, a FIRE EI red in the N1 indicator, and the aural LEFT or RIGHT ENGINE FIRE.
The engine fire extinguishing system includes two bottles. If required, both bottles can be discharged into either engine.
COMPONENTS AND OPERATION DETECTION LOOPS
Each engine is installed with dual fire detection loops. The loops provide fire detection around the core engine area, engine accessory area, forward nacelle and pylon areas. The loops are connected to the fire detection and extinguishing control unit (FIREX-CU). The loops are constructed of an outer metal sheathing and two internal wires that are separated by an insulating material (thermistor). One of the wires carries electrical current; the other is grounded to the outer sheathing at the control unit. The resistance of the thermistor decreases with an increase in temperature.
When the electrical resistance decreases to a trip point, electrical current from the live internal wire conducts to the second internal wire and a fire indication is generated.
This loop system minimizes the possibility of false fire warnings. Both loops must sense the fire or overheat condition un-der similar parameters before flight deck fire indications are generated.
FIRE DETECTION AND EXTINGUISHING CONTROL UNIT
The fire detection and extinguishing control unit is the aircraft fire protection system electronic control unit that monitors the electrical resistance of the loops. The control unit is located in the aft equipment bay. When both loops experience the 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.
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