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Display Overtemperature Indications
Figure 08---30---6
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).
REV 56, Jan 31/03
Vol. 1 08--30--8
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
DISPLAY
FAN 1 AC ESS 3 C9
Display Fans
DISPLAY
FAN 2 AC BUS 1 1 D2
DISPLAY
FAN STBY AC ESS 3 C6
Avionics
EXHAUST
FAN AC BUS 1 1 C5
Cooling
S t
g ARINC
ARINC FAN 1 AC ESS 3 C12
System
Chassis Fans ARINC FAN 2 AC BUS 2 D2
CONT2
2
L2
CKPT SOV DC BUS 2
L3
Controller and
Sh ff V l
I/B SOV L4
Shutoff Valves O/B SOV DC BUS 1 1 L4
AVIONICS
CONT 1 DC ESS 4 C4
Vol. 1 08--40--1
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Aft Cargo Bay Ventilation System
Flight Crew Operating Manual
CSP A--013
MASTER
1. CARGO COMPARTMENT AIR SYSTEM
The cargo compartment air system allows the flight crew to control the ventilation air within
the cargo compartment. The system consists of a recirculation air shut--off valve,
recirculation fan and an exhaust air shut--off valve. <0043><0059>
The cargo compartment conditioned air system allows the flight crew to control the
ventilation air and temperature within the cargo compartment. The system consists of a
recirculation air shut--off valve, recirculation fan, heater and an exhaust air shut--off valve.
<0013><0034>
The system is controlled by a 2--position CARGO, OFF/FAN switch on the air-conditioning
panel. In the OFF position, both shut--off valves are closed and the system is disabled. In
the FAN position, both shut--off valves open and the fan is powered to blow recirculated
cabin air into the cargo compartment to maintain the compartment temperature above
freezing. <0043><0059>
The system is controlled by a CARGO, 3--position, OFF/FAN/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 FAN position, both shut--off valves open and the recirculation fan is
powered to blow recirculated cabin air into the cargo compartment to maintain the
compartment temperature above freezing. In the COND AIR position, both shut--off valves
are open, the heater is enabled and the recirculation fan is powered to blow heated air into
the cargo compartment. The heater is controlled by a temperature control switch in the
exhaust duct which will cycle the heater ON and OFF as necessary to maintain the cargo
compartment temperature between 21_C and 27_C (70_F and 80_F). <0013><0034>
An overheat switch in the exhaust duct provides overtemperature protection by removing
power to the heater when the exhaust duct temperature exceeds 49_C (120_F). A signal is
also sent to the EICAS to display a CARGO OVHT caution message. The switch will reset
when the temperature decreases below 29_C (85_F). <0013><0034>
A duct overheat switch is installed in the heater outlet. If the heater discharge temperature
exceeds 49_C (120_F) power is removed from the heater. The switch will reset when the
temperature decreases below 38_C (104_F). <0013><0034>
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 cargo compartment. <0043><0059>
The system interacts with the cargo bay smoke detectors and fire extinguishing system (See
Chapter 10, Fire Protection). When smoke is detected, the heater power is removed and the
shut-off valves automatically close to isolate the cargo compartment. <0013><0034>
NOTE
For ground operations with the cargo compartment
door open, the CARGO switch may be set to COND
AIR. For ambient temperatures above 30_C (86_F),
this may result in a cargo overheat caution message.
The cargo switch must be reset to the FAN position
after the cargo door has been closed. <0013><0034>
REV 56, Jan 31/03
Vol. 1 08--40--2
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