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 F.  Most of the main deck compartment air leaves the compartment through grilles in the sidewall at floor level and flows into the lower cargo compartment sidewall areas. The air then flows either forward to an overboard valve or aft to the area behind the bulk cargo compartment where the pressurization outflow valves are located. The two outflow valves, controlled by the pressurization control system, are fully open when the airplane is on the ground and modulate in flight to regulate cabin pressure.
 G.  The ventilation system is used to improve cabin air circulation and remove odors from confined spaces. An overboard valve, located adjacent to the nose gear wheel well, is used to improve circulation in the forward section of the airplane.
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A
747-400
MAINTENANCE MANUAL

SEE B OUTFLOW VALVES PRESSURIZATION 
SEE A RAM AIR INLETS  SEE A PACK 1 AIR CONDITIONING EQUIPMENT BAY  PACK 2  SEE C AIR MANIFOLD CONDITIONED 
MANIFOLD BLEED AIR 
EXITS RAM AIR 
PACK 3 
INLETS RAM AIR  A AIR CONDITIONING EQUIPMENT BAY RAM AIR INLETS AND 
Figure 1 (Sheet 1) Air Conditioning Equipment Location 

D09119
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FORWARD MAIN DECK 
CARGO RISERS 
AFT MAIN DECK 
CARGO RISER 
PRESSURIZATION OUTFLOW VALVE 
(EXAMPLE) 
B 
TRIM 
AIR 
SYSTEM 
(REF) 

TO AFT CARGO COMPARTMENT
FLIGHT DECK,
TO FORWARD UPPER DECK, AND
CARGO COMPARTMENT CREW REST AREA RISERAFT MAIN DECK CARGO RISERS
TRIM AIR SYSTEM (REF) CONDITIONED AIR MANIFOLD
C
Air Conditioning Equipment Location
Figure 1 (Sheet 2)

D09145
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FORWARD MAIN DECK DISTRIBUTION DUCT
UPPER DECK AND CREW REST AREADISTRIBUTION DUCT
AFT MAIN DECK DISTRIBUTION DUCT
FLIGHT DECK DISTRIBUTION DUCT
PACK 3 OUTLET
LOWER FORWARD CARGO DISTRIBUTION DUCTS
PACK 2 OUTLET
LOWER AFT CARGO DISTRIBUTION DUCTS
Air Conditioning Equipment Location Figure 1 (Sheet 3)
D09214
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A
747-400
MAINTENANCE MANUAL

COOLING SYSTEM
Air Conditioning Equipment Location
Figure 1 (Sheet 4)

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D09254
A
747-400
MAINTENANCE MANUAL

 H.  Electrical/electronic (E/E) equipment generates heat which must be dissipated by forced air circulation cooling. An independent equipment cooling system provides cooling air for the flight deck panels and the E/E equipment in the forward and center equipment bays. A fan in the forward cargo compartment left sidewall draws air through a screen and air cleaner and exhausts it into the E/E equipment. A second fan draws air from the E/E equipment and exhausts the air either into the forward cargo compartment or overboard.
　
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