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COCKPITDISPLAYCOOLING
SHUT-
OFF VALVE CONDITIONEDAIR FROMACUNO.1
CRT-
DISPLAY
LOW-
FLOW
FAN 1
DETECTOR (UPPER)
STANDBYFAN
DISPLAYSUPPLY
FANANDCHECK
VALVE
CRT COOLING
FAN 2
SYSTEM
(LOWER)
Avionics Cooling Fan Selector Panel Center Pedestal
Avionics Cooling ---CRT Display SupplyFigure 08---30---1
Flight Crew Operating Manual MASTER CSP A-
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ENVIRONMENTAL CONTROL SYSTEM Vol. 1 08-
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Avionics Cooling System REV 56, Jan 31/03
Avionics Cooling ---ARINC Supply
Figure 08---30---2
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ENVIRONMENTAL CONTROL SYSTEM Avionics Cooling System Vol. 1 08-
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AVIONICS COOLING DISPLAYFAN1 ACESSBUS
AVIONICS COOLING DISPLAYFAN2 ACBUS1
AVIONICS COOLING DISPLAYFAN STBY ACESSBUS
DISPLAY FAN SELECTOR
NORM -
Fans inEFIS/EICASdisplayduct operate in automatic modeproviding airflow throughflight compartment displays:
Fan 1duringflight, and
Fan 2duringgroundoperations.
FLTALTN -
Selects flightalternate (fan 2) as the reversionary fan.
GNDALTN -
Selects groundalternate (fan 1) as the reversionary fan.
STBY -
Select standby fan as the
reversionary fan. Reversionary mode selectedwhenDISPLAY COOLcaution(amber) indicated on EICAS.
AVIONICS COOLING ARINCFAN1 ACESSBUS
AVIONICS COOLING ARINCFAN2 ACBUS2
ARINC FAN SELECTOR
NORM -
Fans inARINC chassis
supply duct operate in automatic mode
providing airflow throughARINC chassis:
Fan 1duringflight,
Fan 2duringgroundoperations.
FLTALTN -
Selects flightalternate (fan 2) as the reversionary fan.
GNDALTN -
Selects groundalternate (fan 1)
as the reversionary fan. Reversionary mode selectedwhenARINC COOLcaution(amber) indicated on EICAS.
Avionics Cooling ---Controls
Figure 08---30---3
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AVIONIC AVIONICS OVERBOARD
EXHAUST EXHAUST EXHAUST
LOW-
FLOW FAN VALVE
TO WING ROOTAREA
TO REAR LOWER FUSELAGE
Avionics Cooling ---Exhaust System
Figure 08---30---4
Flight Crew Operating Manual MASTER
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