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6 Bottle 1 fully discharges . -
The pressure switch on bottle 1 opens as pressure drops below 225 to 275 psi. -
ENG BTL 1 LO is displayed on the EICAS. ON OUT ON OUT
7 If fire condition in left engine persists. --LH ENG FIRE PUSH switchlight remains on. ON OUT ON OUT
FIRE PROTECTION Vol. 1 10-
20-
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Fire Detection and Extinguishing (FIDEEX) REV 56, Jan 31/03
ENGINE FIRE EXTINGUISHING
8 BOTTLE 2 ARMED PUSHTO DISCH switchlight is pressed in. -
Left squib on bottle 2 fires. -
FIREX agent from bottle 2 discharges into left engine engine fire zone A. ON OUT ON OUT
9 Bottle 2 fully discharges . -
Thepressureswitchon bottle 2 opens as pressure drops below 225 to 275 psi. -
ENG BTL 2 LO is displayed onEICAS. OUT OUT OUT OUT
D. APU
The APUfire detection system is usedtodetect afire oroverheatcondition in theAPU enclosure. Thedetection systemconsistsofdualheatsensitive detection loops arrangedin parallel aroundtheinside oftheAPU enclosure. Eachloopis connectedto thecontrolunitandis monitored continuouslyforfire oroverheat conditions. In normal operation,bothdetection loops mustdetect afire oroverheat condition before a fire warning alarm is issued.If ashort or opencircuitfaultis detectedin oneloop,the control unitwill automaticallyswitch to single loopdetection andthe EICASwilldisplay anAPUFIREFAIL caution message ontheprimarypage.
APUfire protection hastwo modesofoperation:
W GroundMode -
When afire is detected,the controlunit closes thefuelandbleed air shutoff valves andtheAPU shutsdown. Five secondslaterthefire bottle automaticallydischargesandthe externalhorn sounds.
W FlightMode -
When afire is detected,the controlunit closes thefuelandbleedair shutoff valves andtheAPU shutsdown,butthefire bottle mustbe discharged manually usingtheAPUBOTTLEARMEDPUSHTODISCH switchlight onthe copilotsglareshield.
Flight Crew Operating Manual MASTER
CSP A-
013
Vol. 1
10-
20-
12
FIRE PROTECTION
REV56,Jan 31/03
Fire Detection and Extinguishing (FIDEEX)
APUTOGGLE
FIRE DETECTION/
/FIREXMONITORPANEL SWITCH WARN/FAIL
TESTSWITCH
MASTER
MASTER
CAUTION
APUFIRE
CAUTION
MASTER
MASTER PUSH
WARNING
WARNING
PILOT’S CO-
PILOT’S
GLARESHIELD GLARESHIELD
XXXXXXXXXXXX
CONTROLUNIT
PRIMARYPAGE
APU ENCLOSURE
SENSOR ELEMENTS
APU Fire Detection System ---Schematic
Figure 10---20---6
Flight Crew Operating Manual
MASTER
CSP A-
013
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