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APU FIRE PUSH (red) light
indicates that a fire is detected
in the APU enclosure.
BOTTLE
ARMED
PUSH TO
DISCH
REV 56, Jan 31/03
Vol. 1 10--20--14
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual MASTER
CSP A--013
APU Fire Extinguishing System
Figure 10--20--8
APU ENCLOSURE
NOZZLE
ASSEMBLY
CARTRIDGE
APU FIRE
EXTINGUISHER
CONTAINER
FILL AND
THERMAL DISCHARGE LINE
FIREX MONITOR
APU BOTTLE
TEST
DCU
FIRE
DETECTION
CONTROL
UNIT
5 SEC
DELAY
RELAY
WEIGHT ON
WHEELS
RELAY
SAFETY FITTING
PANEL
TUBE AND
APU
FIRE
HORN
APU
FIRE
LOOPS
Vol. 1 10--20--15
REV 56, Jan 31/03
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual
CSP A--013
MASTER
APU EICAS Indications <MST>
Figure 10---20---9
Status Page
<0039>
<0039>
Primary Page
<0039>
<0006>
APU FIRE FAIL
APU FIRE
APU BTL LO
APU SQUIB 1
APU SQUIB 2
--Firebell
--Exterior Horn
(Sounds on ground
and system will
automatically
discharge after 5
seconds).
APU SQUIB 1, 2 Advisory message
(green)
Comes on to indicate that the respective
element on the squib is operative.
APU FIRE FAIL Caution (amber)
Comes on to indicate that a failure
exists in the APU fire sensing loops
(A&B).
APU BTL LO Caution (amber)
Comes on to indicate that the APU
firex bottle discharged.
APU FIREWarning (red)
Comes on to indicate
that a fire exists in the
APU.
REV 56, Jan 31/03
Vol. 1 10--20--16
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual MASTER
CSP A--013
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.
-- APU shuts down automatically.
If the aircraft is on the ground:
-- The 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
switchlight is pressed in.
-- BOTTLE ARMED PUSH TO
DISCH light comes on.
-- If airborne, the APU fire shutoff
relay is energized to shut down
the APU.
-- 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
the APU enclosure.
ON ON OUT
5 APU bottle fully
discharges.
-- Pressure switch on bottle
opens as pressure drops below
225 to 275 psi.
-- APU BTL LO is displayed on
EICAS.
OUT OUT OUT
E. Cargo Compartment
The cargo smoke detection system consists of two optical type smoke detectors
(NORMAL and STANDBY) located in the ceiling of the cargo compartment. Both
smoke detectors are protected from damage by a steel cage. Each detector is capable
of producing an alarm signal 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. When smoke is detected by one or both
detectors, air flow into and out of the cargo compartment is shut off to isolate the
compartment. A SMOKE CARGO warning message is displayed on the EICAS primary
page, a SMOKE aural warning is generated and both CARGO SMOKE PUSH
(cover--guarded) switchlights illuminate on the CARGO FIREX panel.
Vol. 1 10--20--17
REV 56, Jan 31/03
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual
CSP A--013
MASTER
NOTE
Operation of mobile transceivers in close proximity to
the smoke detectors or exhaust fumes from ground
handling equipment may cause a false alarm.
Fire extinguishing for the cargo compartment is provided by two FIREX bottles, a high
rate discharge bottle and a low rate discharge bottle. Both bottles are located in the aft
equipment compartment, and are pressurized with extinguishing agent (Halon). Each
bottle has a firing cartridge with two squibs, used to discharge the Halon into the cargo
　
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