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SEE A
SCREEN
VENT DUCT
EXHAUST VALVE
AIRPLANE
SKIN NOZZLE
ELECTRICAL CONNECTOR
MANUAL OPERATING LEVER AND VALVE POSITION INDICATOR
FWD
FORWARD OVERBOARD VALVE ASSEMBLY
A
Ventilation - Component Location
Figure 1 (Sheet 1)

 D08920
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A
747-400
MAINTENANCE MANUAL

FLIGHT DECK VENTILATION FAN
SEE B
CONNECTOR ELECTRICAL 
FAN OUTLET 
FAN INLET 
FWD  FAN  FWD 
B (VIEW IN THE INBOARD DIRECTION) FLIGHT DECK VENTILATION FAN  B (VIEW IN THE OUTBOARD DIRECTION) FLIGHT DECK VENTILATION FAN 

Ventilation - Component Location
Figure 1 (Sheet 2)

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D08928
A
747-400
MAINTENANCE MANUAL

A
FLAPPER VALVE SOLENOID
BULK CARGO FLAPPER VALVE LEFT AND RIGHT  DOOR FLAPPER 
SEE  C 

RESET SWITCH
INBD
BULK CARGO
A FLAPPER VALVE
C SOLENOID
SOLENOID
BULK CARGO COMPARTMENT
SCREEN
SCREEN
AIRFLOW FLAPPER
DOOR
FLAPPER DOOR
RESET SWITCH RESET SWITCH
FLAPPER VALVE OPEN (NORMAL POSITION) FLAPPER VALVE CLOSED A-A A-A
Ventiliation - Component Location Figure 1 (Sheet 3)
D08950
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A

747-400
MAINTENANCE MANUAL

FORWARD CARGO 
VENTILATION 
FANS 
SEE  D 
ELECTRICAL 
CONNECTOR 
FAN 

INLET SCREEN/CHECK VALVE ASSEMBLY
FORWARD CARGO VENTILATION FAN
D
Ventilation - Component Location Figure 1 (Sheet 4)
FWD
INBD
D08961
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A

747-400
MAINTENANCE MANUAL

AFT CARGO VENTILATION FAN
SEE E
ELECTRICAL
CONNECTOR

INLET SCREEN/CHECK VALVE ASSEMBLY FAN
FWD
AFT CARGO VENTILATION FAN
E

Ventilation - Component Location
Figure 1 (Sheet 5)

 D08965
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A
747-400
MAINTENANCE MANUAL

BULK CARGO FAN SEE F
ELECTRICAL CONNECTOR
FAN
INLET SCREEN/CHECK VALVE ASSEMBLY
FWD
INBD
BULK CARGO FANF
Ventilation - Component Location
Figure 1 (Sheet 6)

D08969
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