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discharged overboard through the exhaust vents.
On the ground, airflow through the ram air inlet is inadequate for cooling the heat exchangers. A fan located in the ram air
duct, mechanically driven by the air cycle machine, increases airflow through the duct to cool the heat exchangers.
RAM AIR VALVE
If the air conditioning system fails, ram air can be used to ventilate the cockpit and cabin at low altitude. After descending
below 10 000 ft, selecting the guarded RAM AIR switch to ON opens the ram air valve to provide air flow into the aircraft.
RAM AIR — Used to provide ambient air to ventilate the cockpit and cabin, in the event of PACK and
TRIM AIR failure.
COCKPIT
COLD HOT
CABIN
COLD HOT
MAN TEMP
ON
AIR SOURCE
NORM
PACK ONLY
TRIM AIR
ONLY
OFF
CFO0203002_005
RAM AIR INLET
EXHAUST
RAM AIR
ON
AIR CONDITIONING/PRESSURIZATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 02-03-05
AIR CONDITIONING SYSTEM (Cont)
PNEUMATIC SOURCES
IN FLIGHT OPERATIONS
The engines can provide bleed air at all altitudes. The APU can provide bleed air up to 20 000 ft.
GROUND OPERATIONS
The air conditioning PACK can be operated with air from the APU, aircraft engines, or external ground cart. However, due
to low pressure from the engines at ground idle, it is recommended to use the APU during ground operations.
AIR DISTRIBUTION AND EXHAUST SYSTEM
The Air Distribution and Exhaust System is used to distribute, and ensure air exhaust of conditioned air to the flight deck,
cabin, and lavatory areas. The system is consists of low pressure ducting installed below and above the aircraft floor.
FLIGHT DECK DISTRIBUTION
Flight deck air distribution is ensured by a duct connected to the bulkhead check valve manifold. This duct runs under the
aircraft floor, from the aft pressure bulkhead area to the cockpit. Air is then distributed by outlets at foot and leg level, on
each side of the instrument panel, and a grill outlet on each side console. There are also overhead gaspers that distribute
cold air only. All other outlets are temperature controlled.
PASSENGER CABIN DISTRIBUTION
Cabin air distribution is provided by two main lines connected to the bulkhead check valve manifold. These lines provide
air at foot and head level. Air distribution from the overhead gaspers is cold air only. Air from provided at floor level is
temperature controlled. The upper feed line runs upwards between the aircraft skin and the liner of the cargo compartment
and is integral to the interior furniture located on either side of the aircraft at head level.
LAVATORY VENTILATION
A gasper supplies fresh air to the lavatory compartment.To avoid unpleasant odors in the passenger cabin, more air from
the lavatory is exhausted underfloor than is supplied by the conditioned air system. A vent is installed in the lavatory wall
to equalize pressure.
AIR EXHAUST AND VENTILATON PATH
After fresh air is supplied to the cabin and cockpit, it is dumped overboard through the cabin pressure control system. The
air path in the cabin is designed for optimum comfort of the passengers and crew and optimum equipment ventilation management.
Cabin exhaust air to the under-floor area and outflow valve is ensured through holes in the floor sill. Some of the
cabin air exhaust is also directed under the floor, to ventilate and heat the battery compartment, and directly dumped overboard
through the avionics valve. Cockpit exhaust air to the under-floor area and outflow valve is ensured through holes in
the cockpit floor and center pedestal. Air circulation is also provided at the back of the cockpit displays through specially
designed grilles.
AIR CONDITIONING/PRESSURIZATION
Volume 2 Flight Crew Operating Manual May 06/2005
02-03-06 CSP 100-6 REV 2
AIR CONDITIONING SYSTEM (Cont)
COCKPIT/CABIN AIR DISTRIBUTION SCHEMATIC
T
T
T
T
CFO0203002_008
T T
PACK
T
LEGEND
COCKPIT
COLD HOT
CABIN
COLD HOT
RAM AIR
L BLEED R BLEED
APU
XBLEED
Temperature Sensor
Shutoff Valve
Check Valve
Intermediate Pressure Bleed Aair
Ram Air
Conditioned Air
Cold Air
Precooled Air
AIR SOURCE
NORM
PACK ONLY
TRIM AIR
ONLY
OFF
1 1
2 3
4 4
TO
OUTFLOW
VALVE
AVFAN
PILOT
HEATED MATS
DISPLAYS
CALIBRATED
ORIFICE
EQUIPMENT
CABINETS
LOWER
DUCT
UPPER
DUCT
GASPER
HOT AIR
INJECTORS
PRESSURE BULKHEAD
RIGHT
ENGINE
　
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