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TO FLIGHT
COMPARTMENT
SUPPLY DUCT
ACM
WATER
EXTRACTOR
PACK DISCHARGE
TEMPERATURE
SENSOR
PACK
TEMPERATURE
SENSOR
CONDENSER
REHEATER
PACK DISCHARGE
PRESSURE SENSOR
(ABOVE MIXING MANIFOLD)
T
T
P
AFT PRESSURE
BULKHEAD
Vol. 1 08--20--3
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Packs Control <1201>
Figure 08---20---2
HI TEMP (amber)
Indicates high
temperature sensed in
respective pack outlet.
Air--Conditioning Panel
Overhead Panel
AUTOFAIL (amber)
Indicates failure of
respective pack in
automatic mode.
ECS Page
Vol. 1 08--20--4
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Packs EICAS Indications<1001>
Figure 08---20---3
Primary Page
Status Page
L or R PACK FAULT status (white)
Indicates a fault in respective pack.
L or R PACK AUTOFAIL caution (amber)
Indicates failure of respective pack in
automatic mode and system is not in
manual mode.
L or R PACK caution (amber)
Indicates failure of respective pack in
automatic and manual modes.
L or R PACK OFF status (white)
Indicates that respective pack has been
selected off.
Vol. 1 08--20--5
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Temperature Control
The flight compartment and the passenger compartments have identical but
independently-operated temperature control systems. Each controller subsystem is
dedicated to an air-conditioning pack. Temperature control, in automatic mode, is
provided by CKPT and CABIN selector knobs on the air conditioning panel. Control in
manual mode is provided by left and right pack MAN switchlights and HOT/COLD
switches on the same panel. The individual packs can be manually turned OFF by
selecting the respective L or R PACK switchlight on the air conditioning panel.
Temperature Controls <1201>
Figure 08---20---4
Air--Conditioning Panel
Overhead Panel
Automatic Mode
Temperature Control
Used to provide automatic
control of temperature in
selected compartment.
Manual Mode
Temperature Control
Used to operate air
conditioning
temperature control
valves in manual mode.
Vol. 1 08--20--6
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Temperature Synoptic and EICAS Indications
Figure 08---20---5
Supply Duct Temperature (white)
Displays temperature sensed in respective
air conditioning supply duct. Invalid data
is displayed as amber dashes.
Selected Temperature (cyan)
Displays temperature selected by
respective temperature control when in
automatic mode only. Displays 24 (white)
if data is not available.
MANUAL (white)
Indicates that respective MAN
switch is selected.
Actual Temperature (white)
Displays temperature sensed at
associated temperature sensing fan.
Invalid data is displayed as amber dashes.
CKPT or CABIN TEMP MAN status (white)
Indicates that respective MAN switch is selected.
ECS Page
L or R RARV FAULT status (white)
Indicates that the L or R RARV has failed in the
open or toward the CLSD position.
L RARV FAULT
R RARV FAULT
Status Page
Vol. 1 08--20--7
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
C. Ram Air Ventilation
The cooling airflow for the left and right heat exchangers is supplied from a ram air
intake scoop, located on the forward lower leading edge of the vertical stabilizer.
During normal operations, the ram air passes over the heat exchangers and is then
vented overboard through an exhaust duct in the lower aft fuselage. The ram air supply
duct also provides cooling airflow to the hydraulic system heat exchanger for cooling
No. 1 and No. 2 hydraulic systems fluid (Refer to Chapter 14).
Ram air ventilation is used only when the air conditioning packs fail (unpressurized).
Operating the (guarded) RAM AIR switchlight, on the air--conditioning panel, opens the
normally closed ram air valve. Ram air then enters the flight compartment air supply
system. Ram air is also distributed to the passenger compartment from the mixing
manifold.
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