Equipment Cooling System - Component Location
Figure 1 (Sheet 2)
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D11804
A
747-400
MAINTENANCE MANUAL
DECK FLIGHT FLIGHT DECK OVERHEAD
FAN EXHAUST
MAIN EQUIPMENT CENTER PANELS CHECK VALVE
VALVE EXHAUST INBOARD
PANELS GROUND EXHAUST VALVE
FWD
BYPASS TO VALVE
FORWARD EQUIPMENT COOLING EXHAUST COMPONENTS B TO FORWARD CARGO COMPARTMENT
Figure 1 (Sheet 3) Equipment Cooling System - Component Location
D11806
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A
747-400
MAINTENANCE MANUAL
TEMPERATURE CONTROL PANEL (P5)
SEE D
EQUIPMENT COOLING CARD
ELECTRICAL SYSTEMS CARD FILE
SEE C
ELECTRICAL SYSTEMS CARD FILE
C
FAN FLT TEMP FWD MAIN AFT
DECK AUTO AUTO DECK AUTO
ON TEMP
CW
MAN CW CW
MAN MAN
FWD LOWER AFT ZONE RST TRIM AIR
AUTO LOBE AUTO TEMP ON
SYS FAULTa
CW CW EQUIP COOLING
MAN MAN EQUIPMENT
NORM
COOLING SYSTEM
HI FLOW PACK RST AFT CARGO HT STBY OVRD
SELECTOR ON
ON
SYS TEMPFAULTa
a
TEMPERATURE CONTROL PANEL (P5)
D
Equipment Cooling System - Component Location Figure 1 (Sheet 4)
D11817
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A
747-400
MAINTENANCE MANUAL
AREA BEHIND BULK CARGO COMPARTMENT
SEE E
DOOR 5 (REF)
MAIN DECK FLOOR
FWD AFT EQUIPMENT COOLING FANS
CARGO COMPARTMENT AREA BEHIND BULK
E
Figure 1 (Sheet 5) Aft Equipment Cooling System - Component Location
D11755
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A
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MAINTENANCE MANUAL
B. The E6/E9 valve controls flow of equipment cooling air to the E6 and E9 racks in the center equipment bay. The valve is a butterfly type valve actuated by a dual coil latching solenoid. The E6/E9 valve is powered by 28 volt dc from the 28 vdc MN BAT BUS. The valve has a manual override that also shows the position of the valve.
C. The E6/E9 valve controls flow of equipment cooling air to the E6 and E9 racks in the center equipment bay. The valve is a butterfly type valve actuated by a dual coil latching solenoid. The E6/E9 valve is powered by 28 volt dc from the 28 vdc MN BAT BUS.
D. The valve has a manual override that also shows the position of the valve.
6. 3-way Valve
___________
A. The equipment cooling 3-way valve supplies conditioned pack air to the flight deck instruments when at least two packs are operating.
B. The 3-Way valve is an electrically operated, 115 VAC two position valve. When open, conditioned air is supplied to the flight deck. When closed, equipment cooling supply fan air is supplied to the flight deck.
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