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Figure 08---30---2
RECIRCULATED
CABIN AIR
CHECK
VALVE
ARINC
SUPPLY
FAN 2
(FLT ALTN)
ARINC
SUPPLY
AIR
FILTER
ARINC SUPPLY
FAN 1 (GND ALTN)
ARINC LOW
FLOW DETECTOR
ARINC CHASSIS (RACK)
ARINC CHASSIS (RACK)
REV 56, Jan 31/03
Vol. 1 08--30--4
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual MASTER
CSP A--013
Avionics Cooling --- Controls
Figure 08---30---3
DISPLAY FAN SELECTOR
NORM -- Fans in EFIS/EICAS display duct
operate in automatic mode providing airflow
through flight compartment displays:
Fan 1 during flight, and
Fan 2 during ground operations.
FLT ALTN -- Selects flight alternate (fan 2) as
the reversionary fan.
GND ALTN -- Selects ground alternate (fan 1)
as the reversionary fan.
STBY -- Select standby fan as the
reversionary fan.
Reversionary mode selected when DISPLAY
COOL caution (amber) indicated on EICAS.
AVIONICS
COOLING
DISPLAY FAN 1
AC ESS BUS
AVIONICS
COOLING
ARINC FAN 1
AC ESS BUS
AVIONICS
COOLING
ARINC FAN 2
AC BUS 2
AVIONICS
COOLING
DISPLAY FAN 2
AC BUS 1
AVIONICS
COOLING
DISPLAY FAN
STBY
AC ESS BUS
Avionics Cooling Fan
Selector Panel
Center Pedestal
ARINC FAN SELECTOR
NORM -- Fans in ARINC chassis
supply duct operate in automatic mode
providing airflow through ARINC chassis:
Fan 1 during flight,
Fan 2 during ground operations.
FLT ALTN -- Selects flight alternate (fan 2) as
the reversionary fan.
GND ALTN -- Selects ground alternate (fan 1)
as the reversionary fan.
Reversionary mode selected when ARINC
COOL caution (amber) indicated on EICAS.
Vol. 1 08--30--5
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual
CSP A--013
MASTER
Avionics Cooling --- Exhaust System
Figure 08---30---4
TO WING
ROOT AREA
CRT
DISPLAY
EXHAUST
AVIONICS
EQUIPMENT
RACKS
AVIONIC
EXHAUST
LOW--FLOW
DETECTOR
AVIONICS
EXHAUST
FAN
OVERBOARD
EXHAUST
VALVE
ARINC
TO REAR
LOWER
INBOARD FUSELAGE
EXHAUST
VALVE
ARINC
REV 56, Jan 31/03
Vol. 1 08--30--6
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual MASTER
CSP A--013
Avionics Cooling --- EICAS Indications <MST>
Figure 08---30---5
Primary Page
<0039>
Status Page
<0039>
<0039>
OVBD COOL FAIL status (white)
Comes on during ground operations, if
the overboard avionics cooling SOV
has failed closed with passenger door
unlatched (10 secs. time delay).
INBD COOL FAIL status (white)
Inboard avionics cooling SOV not open
with the passenger door closed (10 secs.
time delay).
NOTE
The inboard cooling shut--off valve (INBD
COOL SOV) is used during flight to flush
cool the avionics system equipment. The
valve is normally closed on the ground
and open during flight.
CKPT COOL FAIL status (white)
Avionics cooling SOV not in correct
position (closed on ground or open
during flight).
COOL EXHAUST FAIL status (white)
Exhaust fan failed or low flow from cooling
exhaust (10 secs. time delay).
OVBD COOL caution (amber)
Overboard avionics cooling SOV not closed with
the passenger door and service door closed
(10 secs. time delay).
NOTE
The avionics cooling overboard shut--off valve
(OVBD COOL SOV) is used during ground
operations to flush cool the avionics system and
dump hot air overboard. The valve is normally
open on the ground and closed during flight. The
airplane will not pressurize to normal levels if the
overboard cooling shut--off valve is failed open.
<0006>
DISPLAY COOL caution (amber)
Low airflow is detected in cockpit display cooling
duct (due to duct disconnection, duct blockage)
or display fan 1 or 2, or standby fan has failed
(10 secs. time delay).
ARINC COOL caution (amber)
Low airflow is detected in ARINC unit cooling
duct (due to duct disconnection, duct blockage)
or avionics cooling fan 1 or 2 has failed (10 secs.
time delay).
Vol. 1 08--30--7
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual
CSP A--013
MASTER
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