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Avionics Cooling EICAS Indications <1001>
Figure 08---30---4
DISPLAY COOL caution (amber)
Indicates low airflow in cockpit display cooling duct
due to duct blockage or disconnection, or a fan
has failed.
OVBD COOL FAIL status (white)
Indicates overboard exhaust shutoff
valve has failed closed with the aircraft
on the ground and the passenger door
unlatched.
OVBD COOL caution (amber)
Indicates overboard exhaust shutoff valve
not closed with passenger door and service
door closed. The airplane will not
pressurize to normal levels if valve has
failed open.
AVIONICS FAN caution (amber)
Indicates that avionics fan has failed or
a low airflow exists in the exhaust duct.
Status Page
Primary Page
OVBD COOL FAIL
Vol. 1 08--30--6
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Display Overtemperature Indications
Figure 08---30---5
Display Overtemperature
warning (red)
Indicates an approaching thermal
shutdown of MFD.
Display Overtemperature
warning (red)
Indicates an approaching thermal
shutdown of PFD.
Sky and ground raster is
removed (to delay thermal
Multifunction Display
Pilot’s and Copilot’s Instrument Panels
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
shutdown).
Vol. 1 08--30--7
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
AVIONICS
DISPLAY
COOLING
FAN 1
AC
ESSENTIAL 1 U2
Avionics
Cooling Display Fans
AVIONICS
DISPLAY
COOLING
FAN 2
AC BUS 1 1 B2
AVIONICS
FAN 1
AC
ESSENTIAL 1 V2
Avionics
Cooling Display Fans AVIONICS
FAN 2 AC BUS 1 1 A2
Post
SB670BA
--21--004
Avionics
Cooling Display Fans DISPLAY FAN
CONT
DC
ESSENTIAL 2 T10
Vol. 1 08--30--8
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 08--40--1
ENVIRONMENTAL CONTROL SYSTEM
Aft Cargo Bay Ventilation System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. AFT CARGO COMPARTMENT VENTILATION SYSTEM
The aft cargo compartment ventilation system allows the flight crew to control the air
ventilation and temperature within the aft cargo compartment. <1201>
The system consists of an inlet shut--off valve, outlet shut--off valve, heater and an
overtemperature switch. The system is supplied with recirculated air from recirc fan1 and/or
air from the mixing manifold. <1201>
The system is controlled by an AFT CARGO, 3--position, OFF/AIR/AIR COND switch on the
air-conditioning panel. In the OFF position, both shut--off valves are closed and the system
is disabled. In the AIR position, both shut--off valves open to allow recirculated air into the
aft cargo compartment to maintain the compartment temperature above freezing. In the
COND AIR position, both shut--off valves are open and the heater is enabled. The heater
will cycle ON and OFF as necessary to maintain the cargo compartment temperature
between 16 and 27_C (60 and 80_F). <1201>
Cargo bay air is exhausted via a ceiling vent, through the outlet valve and ducted beneath
the cargo floor to the outflow valves.
The aft cargo compartment temperature is monitored by a temperature sensor. The sensor
supplies temperature information to air conditioning system controller 2 (ACSC 2) which
controls the operation of the heater. If the temperature in the compartment exceeds 40_C
(104_F), the ACSC removes power from the heater and transmits a signal to the DCUs to
display an AFT CARGO OVHT caution message on the EICAS primary page. The crew
should then select the AFT CARGO switch to the AIR position which will disable the heater
power circuit. <1201>
The system interacts with the cargo bay smoke detectors and fire extinguishing system (See
Chapter 10, Fire Protection). When smoke is detected, the shut-off valves automatically
close to isolate the aft cargo compartment. <1201>
Vol. 1 08--40--2
ENVIRONMENTAL CONTROL SYSTEM
Aft Cargo Bay Ventilation System REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
Cargo Compartment Air System Schematic <1201>
Figure 08---40---1
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