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status page. Views of the aircraft ECS temperature, pressure, valve positions and system
status indications are displayed on the EICAS ECS synoptic page.
Vol. 1 08--10--2
ENVIRONMENTAL CONTROL SYSTEM
Introduction Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Air Conditioning System
Figure 08---10---1
MIXING
MANIFOLD
RIGHT
PACK
LEFT
PACK
AIR CONDITIONING
AND CABIN PRESSURE
CONTROL PANEL
GALLEY
HEATER
CONSOLE
VENTS
GALLEY AND FORWARD
LAVATORY FAN
RECIRCULATION
FAN (2)
SAFETY VALVE
(2)
AUXILIARY
POWER UNIT
HIGH PRESSURE
GROUND
CONNECTION
RAM AIR
INTAKE
OUTFLOW
VALVE
AFT PRESSURE
BULKHEAD
AFT CARGO INLET
SHUTOFF VALVE
GASPER
OVERHEAD BIN
DUCTING
GROUND
VALVE
AVIONICS FAN
(2)
AIR CONDITIONING
SYSTEM CONTROLLERS
(2)
CABIN PRESSURE
CONTROLLERS
(2)
DISPLAY
FILTER
DISPLAY FAN
(2)
LOW FLOW
SENSOR
Galley
Cockpit
Passenger
Cabin
Cargo
Compartment
Ground
Valve
Outflow
Valve
LEGEND
Pressurized by conditioned air
AFT Pressure
Bulkhead
Safety
Valves (2)
CABIN TEMPERATURE
SENSOR (2)
AFT LAVATORY
VENTILATION
LAVATORY
EXHAUST FAN
LOW PRESSURE
GROUND
CONNECTOR
AFT CARGO
EXHAUST
SHUTOFF VALVE
CARGO
HEATER
(OPTIONAL)
Vol. 1 08--20--1
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. AIR--CONDITIONING SYSTEM
There are two air-conditioning systems packs which operate in parallel to supply conditioned
air, through a common distribution system, to the flight and passenger compartments. Each
system consists of an air-conditioning unit or package (PACK), an air-conditioning system
controller (ACSC) and ducting. Ram air is provided for pack cooling and ventilation. The
ACSC also controls the engine bleed air supply system (see Chapter 19).
A. Packs
The packs are located in the aft equipment compartment (Refer to figure 08--20--9) and
provide cooling of the engine or APU bleed air supplies for distribution to the flight and
passenger compartments. Each pack consists of an air cycle machine (ACM), dual
heat exchange, reheater, and condenser which are used to decrease the temperature
and water content of the bleed air used in the conditioning process. The pressurized
conditioned air from both packs is supplied to a mixing manifold, under the aft cargo
compartment floor, where the air is then distributed to the flight and passenger
compartments.
For normal operation, each pack receives hot bleed air from its related engine or from
the APU where it is directed to the primary core of the heat exchanger via a precooler.
The primary core uses ram air to initially cool the bleed air and then the air is directed to
the ACM compressor where the air temperature and pressure is increased. The air is
then directed back for a double pass through the main core of the heat exchanger.
From the main core, the air is then directed to the reheater and condenser where water
is extracted from the air and then fed to the ram air duct to be used as a cooling
medium. Air from the condenser is then directed through the reheater and then to the
ACM turbine where the heat energy is extracted by expanding the air. This causes a
decreases in the air temperature which is then supplied to the mixing manifold of the
distribution system. A ram air regulating valve RARV, which is controlled by the
ACSCs, directs ram air from the the fan in the plenum to the cores of the precooler.
This is done to regulate the temperature of the air from the engines to the heat
exchanger. If the RARV fails, a L (R) RARV FAULT status message is displayed on the
EICAS status page.
Vol. 1 08--20--2
ENVIRONMENTAL CONTROL SYSTEM
Air--Conditioning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Air Conditioning Unit Schematic
Figure 08---20---1
A
A AIR CONDITIONING UNIT
COMPRESSOR
DISCHARGE
TEMPERATURE
SENSOR
COMPRESSOR
TURBINE
PLENUM
DUAL HEAT
EXCHANGER
MAIN CORE
PRIMARY CORE
WATER
SPRAYER
TO
PRE--COOLER
AND EXHAUST
BLEED AIR FROM
FLOW CONTROL
VALVE
RAMAIR
INLET
T
TEMPERATURE
CONTROL VALVE
FWD
RAMAIR
VALVE
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