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FWD CABIN
SUPPLY DUCTS
COCKPIT SUPPLY
DUCTS
AFT CABIN
SUPPLY DUCTS
FLOOD
VALVE
AFT OUTFLOW
VALVE
Cockpit and cabin gaspers supply
Cockpit conditioned air supply
Forward cabin conditioned air supply
Aft cabin conditioned air supply
Recirculation air duct
CABIN FLOOR
Washroom Galley
AFT PRESSURE
BULKHEAD
A
F
T
C
A
B
I
N
F
W
D
C
A
B
I
N
COCKPIT FLOOR
DUCTS
C
O
C
K
P
I
T
LEGEND
FGF0210_003
GASPER
FAN
Gasper Supply
Conditioned air is also distributed via the gasper line. A gasper fan in the baggage compartment
picks up the air in the cooler area of the mix manifold, and blows it through a duct. The duct runs
the length of the cabin and into the cockpit, incorporating individual gasper outlets in the cabin and
cockpit.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−30
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Cockpit Ventilation
In the cockpit, the following air outlets are provided:
• An upward facing outlet in each side console, not adjustable
• A forward facing outlet on each side at roof level, above the crew, not adjustable
• One gasper outlet on each side of the instrument panel, adjustable for flow and direction
• One gasper outlet on each side of the overhead panel, adjustable for flow and direction
• One gasper outlet in the ceiling, adjustable for flow and direction.
VENT
GASPER GASPER
VENT
FLIGHT COMPARTMENT BULKHEAD
COPILOT’S SIDE PILOT’S SIDE
GASPER GASPER
VENT
FGF0210_004
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−31
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Recirculation
Two recirculation fans pull air from the cabin back to the mix manifold. The air is extracted from
each side of forward and aft cabins through holes in the cabin side sills and is ducted under the
floor to the recirculation filters. From the filters, the air enters the recirculation fans and is blown
into the mix manifold to be mixed with incoming air from the packs.
MIX MANIFOLD
RECIRCULATION FILTER
RECIRCULATION FAN
TRIM AIR VALVES
RECIRCULATION FAN OUTLET TO OVERHEAD GASPERS
RECIRCULATION
GF0210_039
FILTER
The ACSC controls the fan speed. In normal operation, fan speed is at minimum but can be
increased when the mix manifold temperature is too low or too high. In manual mode, no speed
command is sent by the ACSC, but the fan will run at minimum speed.
Each fan converter unit can detect internal failures (overheat, overcurrent). If a failure is detected,
the converter unit will shut off fan power and reset the fan. The converter will attempt to restart the
fan (up to three starts), then if failure is still detected, it will shut off the fan and a message is
posted on EICAS. The crew can turn off the RECIRC FAN located on the BLEED/AIR
CONDITIONING control panel.
GF0210_040
BLEED BLEED
RAM AIR
23 °C 23 °C 23 °C
22°C
TRIM AIR
23°C
L PACK R PACK
RECIRC FAN OFF
RECIRC OFF
RECIRC FAIL
OFF
RECIRC
OFF
RECIRC
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−32
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Avionics and Cockpit Display Ventilation
The Avionics and Cockpit Display Exhaust system ensures the ventilation of the avionic equipment
and cockpit displays to prevent excessive heating. Air exhausts through the underfloor and by
recirculation.
The main items ventilated are:
• All cockpit display units, by extracting air from immediately behind them.
• All electronic boxes in the under floor avionics bay, by extracting air from above them.
• All electronic boxes in the avionics rack, by blowing air in and extracting air from around
them.
The cockpit displays are each ventilated internally by two integral fans, which pick up ambient air
at their forward lower edge and dump the hot exhaust air from exits on the higher part of their back
panel. This hot exhaust air enters the space behind the cockpit displays and is ventilated by the
avionics ventilation fan.
Both the under floor avionics bay and cockpit displays ventilation is accomplished by an avionics
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