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 ALL  ú ú 03 Page 1 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FORWARD CARGO COMPARTMENT (REF)
Electrical/Electronic Equipment Centers Figure 1 (Sheet 1)
C46887
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 ALL  ú ú 04 Page 2 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
P92 PANEL P714 PANELP515 PANEL E2 RACK
P615 PANEL  E1 RACK 
P415 PANEL  FORWARD COMPARTMENT 
P715 PANEL  BULKHEAD PARTITION 

P180 PANEL P514 PANEL
P614 PANEL E30 RACK
HINGED ACCESS DOOR (2 LOCATIONS)
LADDER
P414 PANEL ACCESS HATCH
NOSE GEAR ACCESS CRAWLWAYWHEEL WELL (2 LOCATIONS)(REF) E31 RACK
MAIN ELECTRICAL/ELECTRONIC EQUIPMENT CENTER A
STRUT MOUNTED E8 EQUIPMENT RACK
P83 PANEL
 P84 PANEL
 P85 PANEL
E33-1 RACK
APU BATTERY
MAIN ENTRY E33-2 RACK
DOOR NO. 5 LEFT (REF)
INBD FWD
MAIN ELECTRICAL/ELECTRONIC EQUIPMENT CENTER
B
Electrical/Electronic Equipment Centers

Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C.  A blower draws air for electrical/electronic equipment cooling from the cabin through circuit breaker panels and equipment racks. The air passes through the main electrical/electronic equipment center racks and is discharged either to the forward cargo compartment heating system or overboard.
 3.  Forward Electrical/Electronic Equipment Center
______________________________________________
 A.  The forward electrical/electronic equipment center provides space for E-30 and E-31 equipment racks on the left and right side of the nose gear wheel well and P-180 main power center panel. The forward E/E equipment center is accessible by means of a crawlway on each side of the nose gear wheel well leading forward from the main electrical/electronic equipment center.
 4.  Center Fuselage Electrical/Electronic Equipment Center
______________________________________________________
 A.  The center fuselage electrical/electronic equipment center provides space for E-6 and E-9 equipment racks and P54 center equipment panel. The center fuselage E/E equipment center is accessible from outside the airplane through a door in the bottom of the fuselage.
 5.  Aft Electrical/Electronic Equipment Center
__________________________________________
 A.  The aft electrical/electronic equipment center provides space for the E-8 and E-33 equipment racks and P-83, P-84, P-85 and P-183 aft power equipment panels. The E-8 equipment rack and P-83, P-84 and P-85 panels are supported by struts attached to the airplane fuselage aft of door 5 left. The E-33 rack and P-183 panel are also located aft of door 5 left along the sidewall with protective lining panels installed along the forward and inboard sides to provide a measure of protection against undue cargo shift.
 B.  The aft electrical/electronic equipment center provides space for the E-8 and E-33 equipment racks and P-83, P-84, P-85 and P-183 aft power equipment panels. The E-8 equipment rack and P-83, P-84 and P-85 panels are accessible through sidewall access panels on the left side of the door 5 overhead crew rest area and are supported above the aft left coat closet by struts attached to the airplane fuselage. The E-33 rack and P-183 panel is accessible through the aft left coat closet.
 6.  SATCOM Electrical/Electronic Equipment Center
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 A.  The SATCOM electrical/electronic equipment center provides space for E-42 equipment rack which is located just forward and above main deck entry door No. 4 left.
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