Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
ENGINE FIRE EXTINGUISHING
EVENT
Left engine fire
GLARESHIELD INDICATIONS
(procedure is
described, the right
engine fire procedure
is similar)
RESULT LH
ENG
FIRE
PUSH
BOTTLE 1
ARMED
PUSH TO
DISCH
BOTTLE 2
ARMED
PUSH TO
DISCH
MASTER
WARNING
1 Fire condition occurs
in the left engine fire
zone.
-- Firebell sounds.
-- MASTER WARNING and LH
FIRE PUSH switchlights
come on.
ON OUT OUT ON
2 MASTER WARNING
switchlight is pressed
in.
-- Firebell is silenced.
-- MASTER WARNING
switchlight goes out and the
system is reset.
ON OUT OUT OUT
3 Left thrust lever is set
to the SHUTOFF
position.
-- LH ENG FIRE PUSH
switchlight remains on. ON OUT OUT OUT
4 LH ENG FIRE PUSH
switchlight is pressed
in.
-- BOTTLE 1 ARMED PUSH
TO DISCH switchlight comes
on.
-- BOTTLE 2 ARMED PUSH
TO DISCH switchlight comes
on.
-- Left squibs of bottles 1 and 2
are armed.
-- Left engine fuel SOV closes.
-- Left bleed air SOV closes.
-- Left hydraulic SOV closes.
ON ON ON OUT
5 BOTTLE 1 ARMED
PUSH TO DISCH
switchlight is pressed
in.
-- Left squib on bottle 1 fires.
-- FIREX agent from bottle 1
discharges into left power
plant nacelle.
ON ON ON OUT
6 Bottle 1 fully
discharges.
-- The pressure switch on
bottle 1 opens as pressure
drops below the set point.
-- ENG BTL 1 LO is displayed
on the EICAS.
ON OUT ON OUT
7 Fire condition in left
engine persists.
-- LH ENG FIRE PUSH
switchlight remains on. ON OUT ON OUT
Vol. 1 10--20--7
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
ENGINE FIRE EXTINGUISHING
8 BOTTLE 2 ARMED
PUSH TO DISCH
switchlight is pressed
in.
-- Left squib on bottle 2 fires.
-- FIREX agent from bottle 2
discharges into left engine
nacelle.
ON OUT ON OUT
9 Bottle 2 fully
discharges.
-- The pressure switch on
bottle 2 opens as pressure
drops below the set point.
-- ENG BTL 2 LO is displayed
on EICAS.
OUT OUT OUT OUT
B. APU
Detection
The APU fire detection system is used to detect a fire or overheat condition in the APU
enclosure. The detection system consists of dual heat sensitive detection loops
arranged in parallel around the APU and the forward APU firewall and above the two
APU compartment doors. Each loop is connected to the FIDEEX and is monitored
continuously for fire or overheat conditions. In normal operation, both detection loops
must detect a fire or overheat condition before a fire warning alarm is issued. If a short
or open circuit fault is detected in one loop, the FIDEEX control unit will automatically
switch to single loop detection and signal the EICAS to display a APU FIRE FAIL
caution message on the EICAS primary page.
Vol. 1 10--20--8
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU Fire Detection --- Block Schematic
Figure 10---20---5
PILOT--
INITIATED
TEST
COPILOT
COPILOT’S
GLARESHIELD
PANEL
FIREBELL
CHIME
CHIME
CHIME
DCU
APU
FIRE
PUSH
FIRE
FAIL
FIRE
WARN
TEST
FIRE DETECTION/
FIREX MONITOR PANEL
CHANNEL A
DETECTION
LOGIC
LOOP
A
LOOP
B
CHANNEL B
DETECTION
LOGIC
LOOP
A
LOOP
B
FIRE
DET B
FIRE
DET A
CB1--N2
CB1--N1
28 VDC BATT BUS
CBP--1
FIDEEX CONTROL UNIT
FIRE SYS FAULT
(STATUS)
APU FIRE
(WARNING MSG)
L (R) FIRE FAIL
(CAUTION)
FIRE SYS OK
(ADVISORY)
EICAS DISPLAY
APU ENCLOSURE
ELEMENT 1 ELEMENT 2 ELEMENT 3 ELEMENT 4
LOOPA
ELEMENT 1 ELEMENT 2 ELEMENT 3 ELEMENT 4
LOOP B
Vol. 1 10--20--9
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX) REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Extinguishing
The APU fire extinguishing system provides a means to extinguish fires in the APU
enclosure. The system consists of a single FIREX bottle, located in the aft equipment
compartment, a low pressure switch, a bottle pressure gauge and discharge lines. The
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