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EICAS FIRE
WARNING LOGIC
TO
EICAS
VISUAL
NO. 2
ENGINE
FIREX
BOTTLE
NO. 1
ENGINE
FIREX
BOTTLE
<PRE 0057>
Vol. 1 10--20--7
REV 56, Jan 31/03
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual
CSP A--013
MASTER
B. Control Unit Failure Detection
When the control unit detects a failure in one loop, due to a short or power loss, there is
no indication of the failure until the WARN test is performed. The control unit will
automatically switch to single loop detection. Single loop operation can also be
selected by placing the defective loop switch on the FIRE DETECTION panel from
BOTH to the good loop (A or B). During normal operations with one loop selected, the
following table lists the indications that are displayed if a fire, failure, or power loss is
detected:
LOOP CONDITION (Dual Loops) INDICATIONS
LOOP A LOOP B FAIL MESSAGE
(Caution)
FIRE WARNINGS
Normal Normal
Detecting Fire Detecting Fire ON
Short or Power
Failure
Short or Power
Failure
ON
Normal Detecting False Fire ON
Normal Short or Power
Failure
Detecting Fire Short or Power
Failure
ON
Detecting False Fire Normal ON
Open Normal
Short or Power
Failure
Open
Open Open
Open detecting fire Detecting Fire ON
NOTE: 1. Normal, means a serviceable loop with no fire or short
detected.
2. False Fire, means one loop detects a fire and the other loop is
normal.
3. When a jet pipe overheat is detected, the ENG FIRE switchlight
does not illuminate with the EICAS and aural warnings.
REV 56, Jan 31/03
Vol. 1 10--20--8
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual MASTER
CSP A--013
LOOP CONDITION
(single loop)
INDICATIONS
LOOP A or LOOP B FAIL MESSAGE FIRE WARNINGS
Normal
Detecting Fire ON
Short or Power Failure ON
Open
Open with fire ON
C. Testing
The control unit provides a means of testing the detection system by selectively
simulating fire/overheat and fail conditions on the selected loops (A or B). The following
table lists the possible loop conditions when the WARN test is performed:
LOOP CONDITION
(Both Loops selected)
INDICATIONS
LOOP A LOOP B FAIL MESSAGE
(Caution)
FIRE WARNINGS
Normal Normal ON
Open loop Open loop
Short or Power
Failure
Short or Power
Failure
ON
Normal Open loop
Normal Short or Power
Failure
ON ON
Short or Power
Failure
Open loop ON
Open loop Normal
Short or Power
Failure
Normal ON ON
Open loop Short or Power
Failure
ON
Vol. 1 10--20--9
REV 56, Jan 31/03
FIRE PROTECTION
Fire Detection and Extinguishing (FIDEEX)
Flight Crew Operating Manual
CSP A--013
MASTER
LOOP CONDITION
(Single loop selected)
INDICATIONS
LOOP A or LOOP B FAIL MESSAGE FIRE WARNINGS
Normal ON
Detecting Fire ON
Open loop
Short or Power Failure ON
The following table lists the possible loop conditions when the fail test is performed:
LOOP A LOOP B FAIL MESSAGE (Caution)
Normal Normal ON
LOOP A or LOOP B (Single Loop) FAIL MESSAGE (Caution)
Loop A Selected ON
Loop B Selected ON
The engine fire extinguishing system provides a means to extinguish fires in the left and
right engines. The system consists of two FIREX bottles, located in the aft equipment
compartment, a low pressure switch, a bottle pressure gauge and discharge lines. The
bottles contain Halon and are pressurized to 600 psi. Each bottle has two firing
cartridges (squibs) to permit discharge of the fire extinguishing agent into either engine
nacelle. The pressure switches are connected to the FIDEEX, and if the bottle
pressure decrease to a preset point, an ENG BTL 1 (2) LO caution message will be
displayed on the EICAS primary page.
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
　
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