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manifold also receives recirculated air from the passenger cabin.
FLOW CONTROL
The mix manifold, mounted underfloor, receives fresh air from the packs and
passenger cabin via the recirculation system. The quantities of air distributed to the
various occupied compartments and the thermal requirements of each compartment
are preset values. The split of flows to the three compartments is through suitably
sized orifices at the exit ports of the mix manifold.
The distribution of airflow under steady conditions is as follows:
• Cockpit - 22% of total flow
• FWD Cabin - 39% of total flow
• AFT Cabin - 39% of total flow
The flow split required between cockpit and cabin during cool down is different, since
proportionally more flow is required to cool down the cabin. During this cool down
condition, the flow split is as follows:
• Cockpit - 17.5% of total flow
• FWD Cabin - 34% of total flow
• AFT Cabin - 48.5% of total flow
To achieve this redistribution of flow, a flood valve (FLV) has been installed. When
open, the FLV dumps air directly into the cabin.
The FLV is controlled by ACSC 1 and is opened on the ground when:
- Both pack flow control selectors are HIGH; or
- Cool down mode is detected by the ACSC.
The ACSC closes the FLV when:
- Cool down mode is ended; or
- Pack control selectors are not in HIGH.
AFT PRESSURE BULKHEAD
TO
AFT
CABIN
TO
FWD
CABIN
TO
COCKPIT
RECIRCULATED AIR
FROM CABIN
RECIRCULATED AIR
FROM CABIN
COOL AIR
TO GASPERS
COOL AIR
TO GASPERS
Mix Manifold Trim Air Valves (3)
GX_13_030
AIR FROM PACKS
For Training Purposes Only
Sept 04
13-31
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
AIR DISTRIBUTION AND FLOW PATHS
Side Panel
Outlet
Side Console
Outlet
Overhead
Gasper
Cockpit Supply
Duct
Ceiling
Outlet
COCKPIT FLOOR
Gasper
Supply
Aft Cabin
Supply
Recirculation
(TYP)
Fwd Cabin
Supply Ducts
Fwd Cabin
Supply
Exhaust
Vent
Cockpit Supply
Ducts
Cabin Floor
COCKPIT AND CABIN GASPERS SUPPLY
COCKPIT CONDITIONED AIR SUPPLY
FORWARD CABIN CONDITIONED AIR SUPPLY
RECIRCULATION AIR DUCT
AFT CABIN CONDITIONED AIR SUPPLY
LEGEND
Washroom Galley
Main
Door
C
O
C
K
P
I
T
F
W
D
C
A
B
I
N
A
F
T
C
A
B
I
N
AFT
PRESSURE
BULKHEAD
Flood
Valve
Forward
Outflow
Valve
Cabin
Gaspers
Aft Outflow
Valve
GX_13_031
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-32 For Training Purposes Only
Sept 04
GASPER SUPPLY
Conditioned air is also distributed via the gasper line. This picks up air in the cooler
area of the mix manifold and passes it through a duct. The duct runs the length of the
cabin and into the cockpit incorporating individual gasper outlets in the cabin and
flight deck.
COCKPIT VENTILATION
In the cockpit the following air outlets are provided:
• A non-adjustable upward facing outlet in each side console
• A non-adjustable forward facing outlet on each side at roof level above the crew
• One gasper type vent on each side of the instrument panel, adjustable for flow and
direction
• One gasper outlet each side of the overhead panel, adjustable for flow and
direction
Flight
Compartment Vent
(Adjustable)
Flight
Compartment Vent
(Adjustable)
Flight
Compartment
Gasper
Flight
Compartment
Gasper
Flight Compartment Vent
(Non-adjustable)
Flight Compartment Vent
(Non-adjustable)
FLIGHT COMPARTMENT BULKHEAD
COPILOT’S SIDE PILOT’S SIDE
GX_13_032
For Training Purposes Only
Sept 04
13-33
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
AVIONICS AND COCKPIT DISPLAY VENTILATION
GLOBAL
The system is comprised of two suction ducts connected to an exhaust fan which
exhausts airflow overboard via the forward outflow valve of the cabin pressurization
system. The first duct sucks the air from a manifold which collects the hot air at the
back side of each display in the cockpit. The second is subdivided into two ducts
which run along the top of the avionics bay to collect the hot air coming from the
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