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bottle contain Halon and is pressurized to 600 psi. The bottle has a single firing
cartridge (squib) to permit discharge of the fire extinguishing agent into APU enclosure.
The pressure switch is connected to the FIDEEX, and if the bottle pressure decreases
to a preset point, an APU BTL LO caution message will be displayed on the EICAS
primary page.
Fire Detection and Extinguishing (FIDEEX) --- APU Pushbuttons
Figure 10---20---6
Right Glareshield
BOTTLE ARMED PUSH TO DISCH
Used to discharge APU bottle.
BOTTLE ARMED PUSH TO DISCH
(green) light indicates the squib
is armed and the bottle is charged.
APU FIRE PUSH
Used to arm APU bottle squib.
Closes APU bleed air load control
valve and turns off the APU fuel pump.
APU FIRE PUSH (red) light
indicates that a fire is detected
in the APU compartment.
BOTTLE
ARMED
PUSH TO
DISCH
Vol. 1 10--20--10
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU Fire Extinguishing --- Schematic
Figure 10---20---7
APU POWER
APU FUEL SOV
FIDEEX CONTROL UNIT
DCUs
RIGHT GLARESHIELD PANEL
EICAS DISPLAY
APU SQUIB
(CAUTION)
APU BOTTLE LO
(CAUTION)
CBP--1
CB1--R2
CB1--R3
FIREX A
FIREX B
DC EMERGENCY BUS
MONITOR B (MONITORS
FOR OPEN CIRCUIT)
WOW CIRCUIT A/C ON
GROUND DETERMINES
AUTO EXTINGUISHING
WHEN A/C IS ON THE GND
APU SHUTDOWN SIGNAL
AUTO SHUTDOWN
APU BOTTLE
LOW
PRESSURE
SWITCH
PSEU
WOW
MONITOR A (MONITORS
FOR OPEN CIRCUIT)
MONITORS FOR BOTTLE
LOW PRESSURE
APU ECU
CHANNEL A
CHANNEL B
B
A
CARTRIDGE
APU FIRE
BOTTLE
AUTOMATIC APU
BOTTLE ARM &
DISCHARGE B
AUTOMATIC APU
BOTTLE ARM &
DISCHARGE A
FROM
APU FIRE
DETECTION
SYSTEM
Vol. 1 10--20--11
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Fire Detection and Extinguishing (FIDEEX) --- APU EICAS Indications <1001>
Figure 10---20---8
APU FIRE warning (red)
Indicates that a fire exists in the
APU compartment.
APU SQB caution (amber)
Indicates that the APU bottle
squib has failed or has fired.
APU BTL LO caution (amber)
Indicates that APU bottle has
discharged.
APU FIRE FAIL caution (amber)
Indicates a failure of the APU
detection system.
Primary Page
APU FIRE FIREBELL
APU SQB
APU FIRE FAIL
APU BTL LO
Vol. 1 10--20--12
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU FIRE EXTINGUISHING
GLARESHIELD INDICATIONS
EVENT RESULT APU FIRE
PUSH
BOTTLE
ARMED
PUSH TO
DISCH
MASTER
WARNING
1 Fire condition occurs in
APU fire zone.
-- Firebell sounds.
-- MASTER WARNING and APU
FIRE PUSH lights come on.
-- Emergency shut down is
automatically initiated.
If airplane is on the ground:
-- APU bottle automatically
discharges after 5 seconds.
ON OUT ON
2 MASTER WARNING is
pressed in.
-- Firebell is silenced.
-- MASTER WARNING light goes
out and system is reset.
ON OUT OUT
3 APU FIRE PUSH is
pressed in.
-- BOTTLE ARMED PUSH TO
DISCH light comes on.
-- APU squibs are armed.
-- APU fuel SOV closes.
-- APU bleed air LCV closes.
ON ON OUT
4 BOTTLE ARMED PUSH
TO DISCH is pressed in.
-- APU squib fires.
-- FIREX agent discharges into
APU compartment.
ON ON OUT
5 APU bottle fully
discharges.
-- Pressure switch on bottle
opens as pressure drops below
set level.
-- APU BTL LO is displayed on
EICAS.
OUT OUT OUT
C. Cargo Compartment
The cargo smoke detection system provides smoke detection in the forward and aft
cargo compartments using optical type smoke detectors. Three detectors are located
in the ceiling of the forward cargo compartment and two in the ceiling of the aft cargo
compartment. All the smoke detector are protected from damage by a steel cage.
Each detector is capable of producing an alarm within an established time frame and
smoke concentration level. The detectors are positioned to avoid false alarms with
overlapping coverage to guard against the failure of one detector.
The FIDEEX control unit monitors the cargo bay smoke detectors. Normally, two
　
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