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detectors must detect smoke to issue a cargo compartment smoke warning. If there is
only one serviceable detector within a compartment, the FIDEEX will automatically
switch to single smoke detector operation. In the event of a detector fault, a signal will
be sent by the FIDEEX control unit to the to the EICAS to display a FIRE SYS FAULT
caution message on the EICAS primary page.
Vol. 1 10--20--13
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
NOTE
Operation of mobile transceivers in close proximity to the
smoke detectors may cause a false alarm.
Fire suppression for the forward and aft cargo compartments is provided by a high rate
discharge FIREX bottle and a low rate discharge FIREX bottle. Both bottles are located
inside the right belly fairing, aft of the main landing gear, and are pressurized to 360 psi
with Halon. Each bottle has a forward and aft compartment firing cartridge (squib), used
to discharge the extinguishing agent into either compartment. Each bottle has a low
pressure switch and a pressure gauge. Both bottles discharge simultaneously. The
high rate discharge bottle is designed to quickly deliver extinguishing agent into the
cargo compartment for initial fire suppression. The low rate discharge bottle discharges
slowly, maintaining a flow of extinguishing agent into the cargo compartment (over a 60
minute period) to prevent reignition and allow for aircraft diversion. The pressure
switches are connected to the FIDEEX, and if either bottle pressure decrease to a
preset point, an CARGO BTL LO caution message will be displayed on the EICAS
primary page.
Vol. 1 10--20--14
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) --- Cargo Firex <1001>
Figure 10---20---9
SMOKE AFT or FWD CARGO warning (red)
Indicates that a smoke condition exists in the
forward or aft cargo compartment.
AFT or FWD CARGO SQB 1 or 2 caution (amber)
Indicates that the forward or aft cargo bottle squib 1
or 2 has failed or has fired.
AFT or FWD CARGO DET caution (amber)
Indicates a failure of the forward or aft cargo
detection system.
CARGO BTL LO caution (amber)
Indicates that one or both cargo bottle(s) have
discharged.
CARGO FIREX
FWD
AFT
CARGO
SMOKE
PUSH
BOTTLE
ARMED
PUSH TO
DISCH
CARGO
SMOKE
PUSH
Cargo Firex Panel
Center Pedestal
SMOKE
SMOKE AFT CARGO
SMOKE FWD CARGO
AFT CARGO SQB 1
AFT CARGO SQB 2
FWD CARGO SQB 1
FWD CARGO SQB 2
AFT CARGO DET
FWD CARGO DET
CARGO BTL LO
Primary Page
FWD and AFT CARGO SMOKE PUSH
Used to arm the forward or aft squibs of both
cargo bottles. AFT CARGO SMOKE PUSH
closes the air--conditioning shut--off valve and
turns the heater off.
CARGO SMOKE PUSH (red) light
indicates that a smoke condition is
detected in respective cargo compartment.
BOTTLE ARMED PUSH TO DISCH
Used to discharge both cargo bottles.
BOTTLE ARMED PUSH TO DISCH
(green) light indicates respective squibs
are armed and bottles are charged.
Vol. 1 10--20--15
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
CARGO COMPARTMENT FIRE EXTINGUISHING
EVENT
INDICATIONS
(Aft described;
forward similar)
RESULT CARGO
SMOKE
PUSH
BOTTLE
ARMED
PUSH TO
DISCH
MASTER
WARNING
1 Fire condition occurs in
aft cargo compartment.
-- “Smoke” aural is annunciated.
-- MASTER WARNING and AFT
CARGO SMOKE PUSH lights
come on.
ON OUT ON
2 MASTER WARNING is
pressed in.
-- MASTER WARNING light goes
out and system is reset. ON OUT OUT
3 AFT SMOKE CARGO
PUSH is pressed in.
-- BOTTLE ARMED PUSH TO
DISCH light comes on.
-- Aft squibs of both bottles are
armed.
For aft cargo compartment:
-- Cargo bay heater shuts off.
-- Cargo air-conditioning shut-off
valve closes.
ON ON OUT
4 BOTTLE ARMED PUSH
TO DISCH is pressed in.
-- Aft squibs of both bottles fire.
-- FIREX agent discharges into
aft cargo compartment.
ON ON OUT
5 One bottle fully
discharges.
-- Pressure switch on one bottle
opens as pressure drops below
set level.
-- CARGO BTL LO is displayed
on EICAS.
-- Remaining bottle continues to
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