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Components and Operation
Smoke Detector
The aircraft is equipped with a smoke detection system in the lavatory. When the
smoke density reaches a predetermined level, the smoke detector produces a signal to
the EICAS to alert the crew and sounds an aural alarm in the lavatory. The lavatory
smoke warning signal causes the following aural and visual warnings to occur:
• SMOKE TOILET warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• “SMOKE” aural warning sounds
The aural warning can be silenced by pressing either MASTER WARNING switch/
light. However, the EICAS warning message will remain displayed until the unit resets
itself.
Automatic Fire Extinguisher
In the event of a fire in the lavatory waste container, automatic fire extinguishing is
provided. The bottle is mounted on a bracket beside the waste container. Once the
temperature reaches a predetermined level, two heat-sensitive capsules melt and
release Halon 1211 into the waste container. (Individual aircraft installations may vary,
consult Completion Center documentation for aircraft-specific information.)
FIRE PROTECTION
For Training Purposes Only
May 03
9-13
P I LOT T R A I N I N G GU I D E
Galley Overheat Protection (Optional)
Description
Overheat protection for the galley consists of an optional overheat detection system
that interfaces with the EICAS to provide aural and visual warnings.
Components and Operation
Galley Overheat Detector
When the temperature reaches a predetermined level, the overheat detector provides a
signal to the EICAS to alert the crew of a galley overheat. The galley overheat alert
signal causes the following aural and visual warnings to occur:
• GALLEY OVHT warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• a triple attenson sounds
The aural warning can be silenced by pressing either MASTER WARNING switch/
light. However, the EICAS warning message will remain displayed until the unit resets
itself.
FIRE PROTECTION
9-14 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Portable Fire Extinguishers
Description
Portable Halon 1211 fire extinguishers are provided in both the flight compartment
and the cabin to fight a fire occurring inside the aircraft. Halon 1211 is effective in
fighting Class A, B and C fires.
Components and Operation
Flight Compartment Fire Extinguisher
The flight compartment fire extinguisher is installed behind the copilot’s seat.
Discharging of the Halon is effected by squeezing a spring-loaded lever.
IF A FIRE EXTINGUISHER IS TO BE DISCHARGED IN THE
FLIGHT COMPARTMENT, ALL FLIGHT CREW MUST WEAR
OXYGEN MASKS WITH EMERGENCY SELECTED (100%
OXYGEN).
CREW EXPOSURE TO HIGH LEVELS OF HALON VAPORS
MAY RESULT IN DIZZINESS, IMPAIRED COORDINATION,
AND REDUCED MENTAL SHARPNESS.
Cabin Fire Extinguisher
The cabin fire extinguisher is installed during completion and its location may vary
depending on the interior configuration. Consult the aircraft Completion Center
manual for the specific location(s). Operation is identical to the Flight Compartment
fire extinguisher.
WARNING
FIRE PROTECTION
For Training Purposes Only
Sept 04
9-15
P I LOT T R A I N I N G GU I D E
Main Landing Gear Bay Overheat Detection System
Description
The Main Landing Gear (MLG) is protected by a continuous-loop overheat detection
system in each wheel bin. The loops are monitored for resistance by the overheat
detection control unit which, through EICAS, provides aural and visual warnings of an
overheat condition in the main wheel bins.
Components and Operation
Heat-Sensing Element
The main landing gear bay heat-sensing elements (loops) are installed around the top
inner surface of the main wheel bins. Operation is identical to the engine and APU
fire-sensing elements. The loops are connected to the MLG overheat detection control
unit.
Main Landing Gear Bay Overheat Heat-Sensing Element
Figure 9-9
P604_09_011
Wheel Bins
Detection Loop
FIRE PROTECTION
9-16 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Overheat Detection Control Unit
The overheat detection control unit continuously monitors the loop resistance of the
sensing element (loop). When the electrical resistance decreases to the warning trip
point, the unit produces an overheat warning signal to the EICAS, which causes the
following aural and visual warnings to occur:
• MLG BAY OVHT warning EICAS message is displayed
　
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