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CL_604-FIRE_PROTECTION

 

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Table of Contents
For Training Purposes Only
May 03
9-i
P I LOT T R A I N I N G GU I D E FIRE PROTECTION
Introduction .........................................................................................................................9-1
Engine Fire/Overheat Protection.........................................................................................9-2
Description ....................................................................................................................9-2
Components and Operation..........................................................................................9-2
Heat-Sensing Elements ..........................................................................................9-2
Fire Detection Control Units ....................................................................................9-4
Engine Fire Extinguisher Bottles .............................................................................9-4
LH (RH) ENG FIRE PUSH Switch/Lights................................................................9-6
BOTTLE 1 (2) ARMED PUSH TO DISCH Switch/Lights ........................................9-6
Miscellaneous Test Panel .......................................................................................9-6
Auxiliary Power Unit Fire Protection ...................................................................................9-8
Description ....................................................................................................................9-8
Components and Operation..........................................................................................9-8
Heat-Sensing Element ............................................................................................9-8
Fire Detection Control Unit......................................................................................9-9
APU Fire Extinguishing Bottle .................................................................................9-9
APU FIRE PUSH Switch/Light .............................................................................. 9-10
APU BOTTLE ARMED PUSH TO DISCH Switch/Light ........................................ 9-10
Miscellaneous Test Panel ..................................................................................... 9-10
Baggage Compartment Fire Protection ............................................................................ 9-11
Description .................................................................................................................. 9-11
Components and Operation........................................................................................ 9-11
Smoke Detector .................................................................................................... 9-11
Smoke Detector Test ............................................................................................ 9-11
Lavatory Fire Protection.................................................................................................... 9-12
Description .................................................................................................................. 9-12
Components and Operation........................................................................................ 9-12
Smoke Detector .................................................................................................... 9-12
Automatic Fire Extinguisher .................................................................................. 9-12
Galley Overheat Protection (Optional) .............................................................................. 9-13
Description .................................................................................................................. 9-13
Components and Operation........................................................................................ 9-13
Galley Overheat Detector...................................................................................... 9-13
Portable Fire Extinguishers............................................................................................... 9-14
Description .................................................................................................................. 9-14
Components and Operation........................................................................................ 9-14
Flight Compartment Fire Extinguisher................................................................... 9-14
Cabin Fire Extinguisher......................................................................................... 9-14
FIRE PROTECTION
9-ii For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Main Landing Gear Bay Overheat Detection System ....................................................... 9-15
Description .................................................................................................................. 9-15
Components and Operation........................................................................................ 9-15
Heat-Sensing Element .......................................................................................... 9-15
Overheat Detection Control Unit ........................................................................... 9-16
MLG BAY Overheat Test ...................................................................................... 9-16
Controls and Indicators ..................................................................................................... 9-17
General ....................................................................................................................... 9-17
Engine and APU Fire/Overheat Protection ................................................................. 9-17
Fire Detection and FIREX Monitor Test ...................................................................... 9-18
MLG Bay Overheat Test ............................................................................................. 9-18
Baggage Smoke Detector Test................................................................................... 9-19
EICAS Messages........................................................................................................ 9-20
List of Figures
Graphic Title Figure
For Training Purposes Only
May 03
9-iii
P I LOT T R A I N I N G GU I D E FIRE PROTECTION
Engine Fire Detection .........................................................................................................9-1
Jet Pipe / Pylon Overheat Sensing Element .......................................................................9-2
Engine and APU Fire Extinguishing System.......................................................................9-3
Glareshield Panels..............................................................................................................9-4
Miscellaneous Test Panel ...................................................................................................9-5
APU Fire Detection .............................................................................................................9-6
Copilot’s Glareshield Panel.................................................................................................9-7
Smoke Detector Test Button...............................................................................................9-8
Main Landing Gear Bay Overheat Heat-Sensing Element .................................................9-9
LDG GEAR CONTROL Panel........................................................................................... 9-10
Glareshield Panels............................................................................................................9-11
Miscellaneous Test Panel ................................................................................................. 9-12
Landing Gear Control Panel ............................................................................................. 9-13
Annunciator Panel.............................................................................................................9-14
9-iv For Training Purposes Only
May 03
FIRE PROTECTION P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
FIRE PROTECTION
For Training Purposes Only
May 03
9-1
P I LOT T R A I N I N G GU I D E
CHAPTER 9: FIRE PROTECTION Introduction
The fire protection system is divided into two separate subsystems:
• Fire and overheat detection system
• Fire extinguishing system
The fire and overheat detection system includes components which detect fire,
overheat, or smoke conditions. Fire and overheat detection is provided in the
following areas:
• engines
• jet pipe and pylons
• APU
• main landing gear
Smoke detection is provided in the baggage compartment and the lavatory. Provisions
are also made for an optional galley overheat detection system.
The fire extinguishing system delivers an extinguishing agent to protected areas of the
aircraft; zone A of the engines and the APU enclosure.
The detection and extinguishing systems can be tested and monitored from the
cockpit.
Portable fire extinguishers are provided in the cockpit and cabin.
FIRE PROTECTION
9-2 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Engine Fire/Overheat Protection
Description
The engine fire and overheat protection system detects fire and/or overheat conditions
in the nacelle, jet pipe, and pylon areas of the engine. The engine fire and overheat
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
Tube
Pressure
Switch
Connection
Discharge
Port
APU FIREX
Discharge
Tube
APU FIREX
Bottle
1
Bottle
APU
Enclosure
VIEW LOOKING FORWARD
P604_09_003
2
Bottle
Left
Engine
Right
Engine
Squib
(Dual Firing
Elements)
Gauge
FIRE PROTECTION
9-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
LH (RH) ENG FIRE PUSH Switch/Lights
The engine fire extinguishing system is controlled by the LH (RH) ENG FIRE PUSH
switch/lights.
When the LH (RH) ENG FIRE PUSH switch/light is pressed, the following occurs:
• the Firex bottle squibs are armed, both BOTTLE 1 (2) ARMED PUSH TO DISCH
switch/lights illuminate
• engine generator shuts down
• fuel shutoff valve (SOV) closes
• hydraulic shutoff valve (SOV) closes
• bleed air shutoff valve (SOV) closes
• associated engine igniters disabled
BOTTLE 1 (2) ARMED PUSH TO DISCH Switch/Lights
When an illuminated BOTTLE 1(2) ARMED PUSH TO DISCH switch/light is
pressed, electrical current fires the squibs in the associated bottle and pressurized
Halon is directed into the engine nacelle. The selection of the LH or RH ENG FIRE
PUSH switch/light will determine which engine nacelle will receive the extinguishing
agent.
Glareshield Panels
Figure 9-4
Miscellaneous Test Panel
The Engine Fire/Overheat Protection System may be tested from the Miscellaneous
Test Panel located on the forward pedestal. The FIRE DET WARN/FAIL switch
provides the means of testing the fire/overheat detection system by selectively
simulating fire/overheat conditions and fail conditions.
LH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
WARNING BOTTLE 1
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
ATS
N2 SYNC
ATS
N1 TO
FAIL
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
LH ENG FIRE PUSH
Switch/Light
BOTTLE 1 ARMED
PUSH TO DISCH
Switch/Light
RH ENG FIRE PUSH
Switch/Light
BOTTLE 2 ARMED
PUSH TO DISCH
Switch/Light
P604_09_009
FIRE PROTECTION
For Training Purposes Only
May 03
9-7
P I LOT T R A I N I N G GU I D E
Selecting the switch to the WARN position verifies the continuity of all the sensing
elements and bottle charge status. Selecting the switch to the FAIL position verifies
the ability of the detection control units to discriminate between an actual overheat/fire
and false fire (shorted) loops.
The FIREX MONITOR 1 (2) (APU) TEST switches provide a means for the flight
crew to test the respective squib circuitry continuity.
Miscellaneous Test Panel
Figure 9-5
TEST
TEST
TEST
TEST
TEST
WARN
TEST
FIRE DET
1 2 APU
BOTTLE
FAIL
SPS TEST
FIREX MONITOR AURAL
WARN TEST
LAMP
TEST
OVSP
TEST
1
2
ENG BOTTLE
FIREX MONITOR 1 (2) (APU)
TEST Switches
FIRE DET
WARN/FAIL
Switch
P604_09_008
FIRE PROTECTION
9-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Auxiliary Power Unit Fire Protection
Description
The APU fire detection system is used to detect an overheat/fire condition within the
APU enclosure. The fire detection system continuously monitors the APU. If a fire or
overheat condition is detected, the APU will automatically shut down and an EICAS
message as well as an aural and visual warning will occur. The APU fire extinguishing
system consists of one fire extinguisher bottle.
Components and Operation
Heat-Sensing Element
The APU is protected by one continuous heat-sensing element installed within the
APU enclosure. This sensing element is connected to the APU Fire Detection Control
Unit. Operation of the sensing element is identical to the engine fire detection system.
APU Fire Detection
Figure 9-6
APU Enclosure
Sensing Element
(450°F)
APU COMPARTMENT
VIEW LOOKING FORWARD
P604_09_002
APU Enclosure
FIRE PROTECTION
For Training Purposes Only
May 03
9-9
P I LOT T R A I N I N G GU I D E
Fire Detection Control Unit
The APU has a dedicated fire detection control unit which continuously monitors the
resistance of its own loop. When the electrical resistance decreases to the warning trip
point, the unit produces a fire warning signal to the EICAS which causes the following
aural and visual warnings to occur:
• APU FIRE warning EICAS message is displayed
• MASTER WARNING switch/lights illuminate flashing
• fire bell sounds
• APU FIRE PUSH switch/light illuminates
The APU will also shut down automatically.
The aural warnings can be silenced by pressing either MASTER WARNING switch/
light. However, the EICAS warning message will remain displayed and APU FIRE
PUSH switch/light will remain illuminated until the fire/overheat condition is
corrected.
As with the engine fire-sensing elements, the APU fire detection control unit can
discriminate between an actual fire/overheat and a false fire (i.e., short in the sensing
element). In the event of APU fire detector loop failure, the APU FIRE FAIL caution
EICAS message will be displayed.
APU Fire Extinguishing Bottle
APU fire extinguishing is provided by one Firex bottle located adjacent to the APU
compartment in the aft equipment bay. The bottle is charged with Halon 1301 and
pressurized with dry nitrogen (600 to 625 psi).
The APU Firex bottle is equipped with a pressure gauge and a thermal discharge port
and is connected by a single tube to the APU compartment. The pressurized
extinguishing agent is discharged by a squib with dual firing cartridges, for
redundancy.
The thermal discharge port provides overpressure relief. Operation is identical to the
engine Firex bottles.
FIRE PROTECTION
9-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
APU FIRE PUSH Switch/Light
The APU fire extinguishing system is controlled by the APU FIRE PUSH switch/light.
When the APU FIRE PUSH switch/light is pressed, the following occurs:
• the bottle squibs are armed, APU BOTTLE ARMED PUSH TO DISCH switch/
light illuminates
• APU shuts down (if not already shut down)
• APU fuel shutoff valve (SOV) closes
• APU negative-G shutoff valve (SOV) closes
• APU LCV closes
• APU generator shuts down
APU BOTTLE ARMED PUSH TO DISCH Switch/Light
When an illuminated APU BOTTLE ARMED PUSH TO DISCH switch/light is
pressed, electrical current fires the squibs in the APU bottle and pressurized Halon is
directed into the APU enclosure.
Copilot’s Glareshield Panel
Figure 9-7
Miscellaneous Test Panel
The APU Fire Protection System is tested simultaneously with the Engine Fire
Protection System, via the Miscellaneous Test Panel. Refer to the Engine Fire and
Overheat Protection, Miscellaneous Test Panel section for additional information.
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
APU FIRE PUSH
Switch/Light
APU BOTTLE ARMED
PUSH TO DISCH
Switch/Light
P604_09_017
FIRE PROTECTION
For Training Purposes Only
May 03
9-11
P I LOT T R A I N I N G GU I D E
Baggage Compartment Fire Protection
Description
Fire protection for the baggage compartment consists of an electronic smoke detector
that interfaces with the EICAS to provide aural and visual warnings.
Components and Operation
Smoke Detector
The aircraft is equipped with a smoke detection system for the baggage compartment.
When the smoke density reaches a predetermined level, the smoke detector produces a
fire warning signal which causes the following aural and visual warnings to occur:
• SMOKE BAGGAGE BAY 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.
Smoke Detector Test
The baggage compartment smoke detector can be tested by the pushing in and holding
the SMK DET test button located on the ANNUNCIATOR Panel.
Smoke Detector Test Button
Figure 9-8
ANNUNCIATOR PANEL
P604_09_010
RESET
CALL SMK
LAV CAB
FIRE PROTECTION
9-12 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Lavatory Fire Protection
Description
Fire protection for the lavatory consists of an electronic smoke detector that interfaces
with the EICAS to provide aural and visual warnings and an independent fire
extinguisher that operates automatically in the waste container.
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
• MASTER WARNING switch/lights illuminate flashing
• “GEAR BAY OVERHEAT” aural warning sounds
The overheat detection control unit can discriminate between an actual overheat and a
false overheat (i.e., short in the sensing element). In the event of main landing gear
overheat detector failure, the MLG BAY OVHT FAIL caution EICAS message will be
displayed.
MLG BAY Overheat Test
The MLG BAY overheat detection system can be tested from the LDG GEAR
CONTROL panel located on the center forward pedestal. The OVHT test switch is
used to verify the continuity of the heat-sensing element by simulating an overheat/fire
condition. The FAIL test switch is used to verify the ability of the detection control
unit to discriminate between an actual overheat/fire and false overheat/fire (shorted)
loop.
LDG GEAR CONTROL Panel
Figure 9-10
MUTED
OFF
TEST
MLG BAY OVHT TEST
OVHT FAIL
UP DN
LDG GEAR
DN LCK
REL
ANTI-SKID
ARMED
NOSE STEER
ARMED
HORN
OFF
OVHT TEST Switch FAIL TEST Switch
P604_09_012
FIRE PROTECTION
For Training Purposes Only
May 03
9-17
P I LOT T R A I N I N G GU I D E
Controls and Indicators
General
The controls for the various fire protection systems are located on the glareshield; the
systems advisory, caution and warning messages are displayed on EICAS, and the test
switches are located on the MISCELLANEOUS TEST Panel and LDG GEAR control
panel.
Engine and APU Fire/Overheat Protection
Glareshield Panels
Figure 9-11
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
LH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
WARNING BOTTLE 1
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
ATS
N2 SYNC
ATS
N1 TO
FAIL
LH ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:
Illuminated












arms Firex bottle 1 and 2, BOTTLE 1 (2) ARMED PUSH TO
DISCH switch/lights illuminate green
closes left fuel shutoff valve (SOV)
closes left hydraulic shutoff valve (SOV)
shuts down generator 1
closes left 10th- and 14th-stage bleed air shutoff valves (SOVs)
disables left engine ignition
– Indicates a left engine overheat/fire condition.
BOTTLE 1 ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge Firex bottle 1
agent into applicable engine.
– Indicates Firex bottle 1 is armed
for discharge.
: Switch/light will extinguish after agent
is discharged.
NOTE
BOTTLE 2 ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge Firex bottle 2
agent into the applicable engine.
– Indicates Firex bottle 2 is armed
for discharge.
: Switch/light will extinguish after agent is
discharged.
NOTE
RH ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:












arms Firex bottle 1 and 2, BOTTLE 1 (2) ARMED PUSH TO
DISCH switch/lights illuminate green
closes right fuel shutoff valve (SOV)
closes right hydraulic shutoff valve (SOV)
shuts down generator 2
closes right 10th- and 14th-stage bleed air shutoff valves
(SOVs)
disables right engine ignition
P604_09_013
APU ENGINE FIRE PUSH Switch/Light
(guarded, alternate-action)
Push:
Illuminated










commands an APU shutdown.
arms APU Firex bottle, APU BOTTLE
ARMED PUSH TO DISCH switch/light
illuminates green.
closes APU Fuel Shutoff Valve and
Negative-G Shutoff Valve
closes APU LCV
shuts down APU generator
– Indicates an APU
overheat/fire condition.
APU BOTTLE ARMED PUSH TO DISCH
Switch/Light (momentary-action)
Push
Illuminated
– Fires squib to discharge APU Firex bottle
agent into the APU enclosure.
– Indicates APU Firex bottle is armed
for discharge.
: Switch/light will extinguish after agent is
discharged.
NOTE
LEFT GLARESHIELD
RIGHT GLARESHIELD
FIRE PROTECTION
9-18 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Fire Detection and FIREX Monitor Test
Miscellaneous Test Panel
Figure 9-12
MLG Bay Overheat Test
Landing Gear Control Panel
Figure 9-13
TEST
TEST
TEST
TEST
TEST
WARN
TEST
FIRE DET
1 2 APU
BOTTLE
FAIL
L R G SWITCH
SPS TEST
FIREX MONITOR AURAL
WARN TEST
LAMP
TEST
OVSP
TEST
1
2
1
2
1
2
ENG BOTTLE
P604_09_018
FIREX MONITOR TEST Switches
(spring-loaded to normal position)
TEST – Tests applicable Firex bottle
squib circuit continuity.
FIRE DET Switch (spring-loaded to OFF)
WARN
FAIL
– Tests engine (both engine and jet
pipe/pylon) and APU fire detection loops for
continuity by simulating an overheat/fire
condition, verifies engine and APU bottle
charge.
– Tests engine (both engine and jet
pipe/pylon) and APU fire detection units’
ability to discriminate between a shorted
loop and an actual overheat/fire.
MUTED
OFF
TEST
MLG BAY OVHT TEST
OVHT FAIL
UP DN
LDG GEAR
DN LCK
REL
ANTI-SKID
ARMED
NOSE STEER
ARMED
HORN
OFF
P604_09_014
MLG BAY OVHT TEST Switch
(spring-loaded to normal position)
OVHT – Tests MLG Bay overheat loop
continuity by simulating an overheat
condition in the main landing gear bay.
MLG BAY OVHT Warning FAIL TEST Switch
(spring-loaded to normal position)
FAIL – Tests MLG Bay overheat detection control units’
ability to discriminate between a shorted loop and an
actual overheat.
FIRE PROTECTION
For Training Purposes Only
May 03
9-19
P I LOT T R A I N I N G GU I D E
Baggage Smoke Detector Test
Annunciator Panel
Figure 9-14
RESET
CALL SMK
LAV CAB
P604_09_015
SMK DET Switch (momentary-action)
Push – Tests the baggage compartment
smoke detector unit.
FIRE PROTECTION
9-20 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
EICAS Messages
The fire and overheat protection system messages are shown on the EICAS Primary
and Status pages. The fire and overheat protection system messages and aural
warnings are listed below. A brief explanation of each message is provided.
MESSAGE MEANING AURAL WARNING
(IF ANY)
APU FIRE Fire detected in the APU enclosure. FIRE BELL
L ENGINE FIRE
Fire detected in the respective engine nacelle. FIRE BELL
R ENGINE FIRE
L JETPIPE OVHT
Overheat detected in the respective jetpipe and/or pylon area. “JETPIPE OVERR
JETPIPE OVHT HEAT”
GALLEY OVHT Galley overheat detected (if galley overheat detector is installed). TRIPLE ATTENSON
SMOKE BAGGAGE BAY Smoke detected in the baggage compartment. “SMOKE”
SMOKE TOILET Smoke detected in the lavatory area. “SMOKE”
APU BOTTLE LO APU firex bottle pressure is low.
APU FIRE FAIL APU fire detection loop is failed (shorted out).
APU NEG-G SOV
APU negative-G shutoff valve is open after actuation of the APU FIRE PUSH switch/light,
or the negative-G shutoff valve position does not match the APU PWR FUEL switch/light
position within 5 seconds.
APU SOV
APU fuel shutoff valve is open after actuation of the APU FIRE PUSH switch/light, or the
fuel shutoff valve position does not match the APU PWR FUEL switch/light position within 5
seconds.
ENG BOTTLE 1 LO
Respective engine firex bottle pressure is low.
ENG BOTTLE 2 LO
L ENG SOV Respective fuel shutoff valve is not closed after actuation of the ENG FIRE PUSH switch/
R ENG SOV light.
L FIRE FAIL
Respective fire detection loop is failed (shorted out).
R FIRE FAIL
HYD SOV 1 Hydraulic shutoff valve is not closed after actuation of the respective ENG FIRE PUSH
HYD SOV 2 switch/light.
L JETPIPE OVHT FAIL
The respective jetpipe/pylon overheat detection loop is failed (shorted out).
R JETPIPE OVHT FAIL
APU SOV CLSD APU fuel shutoff and negative-G shutoff valves have closed after actuation of the APU
FIRE PUSH switch/light.
APU SQUIB 1 OK
Respective squib has passed its self-test.
APU SQUIB 2 OK
L ENG SOV CLSD Respective engine fuel shutoff valve has closed after actuation of respective ENG FIRE
R ENG SOV CLSD PUSH switch/light.
L ENG SQUIB 1 OK
Respective squib has passed its self-test.
L ENG SQUIB 2 OK
R ENG SQUIB 1 OK
R ENG SQUIB 2 OK
HYD SOV 1 CLSD Respective hydraulic shutoff valve has closed after actuation of the respective ENG FIRE
HYD SOV 2 CLSD PUSH switch/light.
EICAS Messages
Table 9-1

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