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Air--Conditioning System
Flight Crew Operating Manual MASTER
CSP A--013
E. Low Pressure Ground Air Connection <0007>
An external ground air connector, located on the right aft fuselage, is provided for
ground air-conditioning. Low pressure compressed air from a ground air conditioning
cart can be supplied directly into flight and passenger compartment distribution
systems.
F. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Left Pack L AIR COND
UNIT J1
Air
C diti i C k it
CKPT
TEMP/CONT DC BUS 1
1
J2
Conditioning
-- Flight
Compartment
Cockpit
Temperature
Control
CKPT
TEMP/CONT
MAN
J3
CKPT FAN AC BUS 1 C8
Ram Air RAM AIR SOV DC BAT P5
Right Pack R AIR COND
UNIT J1
Air
CABIN
TEMP/CONT DC BUS 2
2
J2
Conditioning
-- Cabin
Cabin
Temperature
CABIN
TEMP/CONT
MAN
J3
Control
GALLEY FAN
AC BUS 2
C5
CABIN FAN
C8
Vol. 1 08--30--1
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual
CSP A--013
MASTER
1. AVIONICS COOLING SYSTEM
The electronic flight instruments in the flight compartment instrument panel, control panels
and display units in the center pedestal, and electronic units in the left and right portions of
the underfloor avionics bay are cooled during on-ground and flight operations.
The cockpit displays are cooled with air from two display fans located under the flight
compartment floor. Fan control is provided by a DSPLY FAN selector knob on the avionics
cooling panel. Normally, only one fan operates at a time (controlled by WOW). In flight, only
fan 1 is powered and on the ground, only fan 2 is powered. When powered, the respective
fan draws in recirculated air from the flight compartment and mixes it with conditioned air
then supplies the air to the backs of each display. In the event of a fan failure, the alternate
fan can be powered by selecting the FLT ALTN or GND ALTN position. If both fans fail,
selecting STDBY permits conditioned air to ventilate the displays. A low flow sensor
monitors the air flow to ensure adequate cooling. Check valves prevent loss of cooling air or
reverse flow.
Two ARINC cooling fans are installed under the flight compartment floor. The fans are used
to provide recirculated cabin air to the left and right avionics equipment racks. Fan control is
provided by an ARINC FAN selector knob on the avionics cooling panel. In the NORM
position, only one fan operates at a time (controlled by WOW). In flight, only fan 1 is
powered and on the ground, only fan 2 is powered. In the event of a fan failure, the
alternate fan can be powered by selecting the FLT ALTN or GND ALTN position.
The avionics exhaust system consists of an exhaust fan, an inboard exhaust valve and an
outboard exhaust valve. The exhaust fan is installed in the avionics compartment and
operates whenever AC BUS 1 is powered. The fan is used to remove warm air from the
CRT displays, pedestal panels and the left and right avionics equipment racks, then direct it
to the exhaust valves. When either the passenger door or service door is open, the inboard
valve is closed and the outboard valve is open to exhaust the air to the wing root area.
When the passenger and service doors are closed, the outboard valve is closed and the
inboard valve is open to exhaust the air to the rear lower fuselage where it is dumped
overboard through the outflow valves.
REV 56, Jan 31/03
Vol. 1 08--30--2
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual MASTER
CSP A--013
Avionics Cooling --- CRT Display Supply
Figure 08---30---1
Avionics Cooling Fan Selector Panel
Center Pedestal
STANDBY FAN
RECIRCULATED
AIR FROM FLIGHT
COMPARTMENT
COCKPIT DISPLAY COOLING
SHUT--OFF VALVE
CONDITIONED AIR
FROM ACU NO.1
FAN 2
(LOWER)
DISPLAY SUPPLY
FAN AND CHECK
VALVE
FAN 1
(UPPER)
EXHAUST
FROM CRT
TO AVIONICS
EXHAUST FAN
CRT--DISPLAY
LOW--FLOW
DETECTOR
CRT COOLING
SYSTEM
6 WAY DUCT (REF)
CRT
DISPLAYS
COCKPIT
GASPERS INLET FROM FLIGHT
COMPARTMENT
FROM
ACU
NO.1
Vol. 1 08--30--3
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Avionics Cooling System
Flight Crew Operating Manual
CSP A--013
MASTER
Avionics Cooling --- ARINC Supply
　
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