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protection system is divided in two zones, Zone A and Zone B:
• Zone A includes the combustion area of the engine. Overheat/fire detection and
extinguishing is provided
• Zone B consists of the jet pipe and pylon area. Only overheat/fire detection is
provided for this zone
Each zone produces a distinctive aural and visual warning when an overheat and/or
fire condition is detected.
The extinguishing system consists of two fire extinguisher bottles. Either or both
bottles can be discharged into the zone A area of the engines.
Components and Operation
Heat-Sensing Elements
Each zone of the engine is protected by a single continuous heat-sensing element
(loop) connected to its respective fire detection control unit. Each sensing element is a
coaxial cable which has an inner conductor surrounded by an insulator material. The
resistance of the insulating material decreases with an increase in temperature. The
outer metal sheathing is permanently grounded. The loop resistance information is fed
to the corresponding fire detection control unit.
The Zone A sensing element is used to detect an overheat/fire condition in the
combustion area of the engine.
The Zone B sensing element is used to detect an overheat/fire condition in the area
where electrical harnesses and plumbing go through the engine pylon. In addition, this
sensing element is used to detect an overheat condition in the exhaust nozzle area of
the engine.
FIRE PROTECTION
For Training Purposes Only
May 03
9-3
P I LOT T R A I N I N G GU I D E
Engine Fire Detection
Figure 9-1
Jet Pipe / Pylon Overheat Sensing Element
Figure 9-2
* NOTE: Only ZONE A can receive Fire Extinguishant
ZONE A
P604_09_001
Engine Fire Detection
Sensing Elements
(Zone A)
Aft Mount Ring
Fire Zone A
(Engine Fire Detection)
Fire Zone B
(Engine Jet Pipe/
Pylon Overheat)
P604_09_004
Pylon Sensing
Element
Engine Jet Pipe
(Exhaust Nozzle)
Sensing Element
FIRE PROTECTION
9-4 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Fire Detection Control Units
Each heat-sensing element has its own fire detection control unit which monitors the
resistance of its loop. When the electrical resistance decreases to the warning trip
point, the fire detection control unit prompts EICAS messages as well as aural and
visual warnings to alert the flight crew of a fire and/or overheat condition.
For Zone A, the fire warning signal causes the following aural and visual warnings to
occur:
• L (R) ENG FIRE warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• applicable red LH (RH) FIRE PUSH switch/light illuminates
• fire bell sounds
For Zone B, the fire warning signal causes the following aural and visual warnings to
occur:
• L (R) JETPIPE OVHT warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• “JETPIPE OVERHEAT” aural warning sounds
The aural warnings can be silenced by pressing either MASTER WARNING switch/
light. The EICAS warning message will remain displayed and ENG FIRE PUSH
switch/light will remain illuminated until the fire/overheat condition is corrected.
The fire detection control units can discriminate between a true fire/overheat and a
short in the heat sensing element. In the event of fire detector loop failure, the
applicable L(R) FIRE FAIL or L(R) JETPIPE OVHT FAIL caution EICAS message
will be displayed.
Engine Fire Extinguisher Bottles
Two engine Firex bottles are installed in the aft equipment bay under the APU
enclosure. The bottles are charged with Halon 1301 and pressurized with dry nitrogen
(600 to 625 psi).
Each bottle is equipped with a left and right squib (electrically actuated discharge
cartridges), thermal discharge port, pressure gauge and a left and right discharge line.
The discharge lines are interconnected to allow discharge of both bottles (if needed)
into one engine. The selection of the LH or RH ENG FIRE PUSH switch/light will
determine which squibs are fired.
The thermal discharge port provides overpressure relief for each Firex bottle. Should
the pressure in a Firex bottle exceed 1400 psi, the thermal discharge port will
discharge the extinguishing agent in the immediate vicinity of the bottle.
FIRE PROTECTION
For Training Purposes Only
Sept 04
9-5
P I LOT T R A I N I N G GU I D E
Engine and APU Fire Extinguishing System
Figure 9-3
APU Firex
Bottle
Thermal
Discharge
　
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