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D22261
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747-400
FAULT ISOLATION/MAINT MANUAL
FORWARD EQUIPMENT COOLING
EXHAUST COMPONENTS
SEE M SHT 8
FLIGHT DECK
OVERHEAD PANEL
DIFFERENTIAL
PRESSURE SWITCH,
FLIGHT DECK S1981
LOW FLOW
DETECTOR,
M7933
E/E RACKS
M7934 LOW FLOW DETECTOR, MAIN EQUIPMENT SUPPLY COMPONENTS FORWARD EQUIPMENT COOLING
SEE L SHT 7
FORWARD EQUIPMENT COOLING SYSTEM
Cooling - Component Location
Figure 102 (Sheet 6)
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A
747-400 FAULT ISOLATION/MAINT MANUAL
CHECK VALVE
AIR CLEANER TO MAIN EQUIPMENT CENTER
THREE-WAY VALVE, V555 TO FLIGHT DECK OVERHEAT SWITCH, S1977
OVERHEAT SUPPLY FAN, B7436
SWITCH, S2311
SMOKE/OVERRIDE VALVE, V448
SMOKE DETECTOR, M7931
BYPASS
FWD VALVE,CONDITIONED V446
AIR SKIN TEMPERATURE TO E1/E2 SWITCH, S1888
AIR
INLET
INBOARD FAN
SUPPLY AIR E6/E9 VALVE, V449 FROM
VALVE,
CLEANER
EXHAUST
V444
PURGE LINE
FAN
TO E6/E9
RACKS
FORWARD EQUIPMENT COOLING SUPPLY COMPONENTS
L
Cooling - Component Location (Detail from Sht 6)
Figure 102 (Sheet 7)
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747-400 FAULT ISOLATION/MAINT MANUAL
FLIGHT DECK OVERHEAD DECK FLIGHT
FAN, B7437 EXHAUST
CENTER EQUIPMENT MAIN PANELS VALVE CHECK
VALVE, V445 INBOARD EXHAUST
PANELS VALVE, V447 EXHAUST GROUND
FWD
VALVE TO BYPASS
COMPARTMENT TO FORWARD CARGO
FORWARD EQUIPMENT COOLING EXHAUST COMPONENTS M
Figure 102 (Sheet 8) Cooling - Component Location (Detail from Sht 6)
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747-400
FAULT ISOLATION/MAINT MANUAL
AREA BEHIND BULK CARGO COMPARTMENT
SEE N
DOOR 5 (REF)
MAIN DECK FLOOR
AFT EQUIPMENT
FWD
COOLING FANS, B8598, B8599 AREA BEHIND BULK CARGO COMPARTMENT
N
Cooling - Component Location
Figure 102 (Sheet 9)
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747-400 MAINTENANCE MANUAL
AIR CONDITIONING PACK SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________
1. General (Fig. 1)_______
A. Heated bleed air from the pneumatic system is cooled by air conditioning packs before distribution to the airplane cabin. Three independent air conditioning packs with identical components regulate the amount of air drawn from the pneumatic manifold for air conditioning, cool the air, and extract excess moisture from the air. The air conditioning packs are located under the wing center section.
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