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 B.  The insulation blankets, in addition to performing their thermal insulating and noise attenuation functions, serve to prevent inner skin condensation from leaking into the compartment, by draining the moisture down into the lower section of the fuselage where airplane drainage is provided. In some areas the blankets also help to prevent a sidewall fire. To perform these functions properly, it is important that all blankets be overlapped and fitted tightly and sealed to form an air-tight seal around any protruding structure.
 C.  The insulation blankets and cap strips vary in size, depending on their location, and are attached to the airplane structure with plastic fasteners. Numerous combinations of the plastic fasteners are used, with each combination determined by location, shape and size of structure to which the blanket is attached. Each blanket part number is stamped on the inboard surface.
 D.  For insulation blanket repair, refer to 25-00-00/801.
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 25-21-00
 ALL  ú ú 11 Page 5 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 UPPER DECK WINDOW REVEAL AND SHADE - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
Remove the window reveal panel

 (2)  
Install the window reveal panel.

 B.  To remove each reveal panel, the ceiling panel above it must be removed. The reveals are installed in the passenger compartment between the ceiling panels and dado panels.
 TASK 25-21-02-004-001
 2.  Remove the Window Reveal Panel (Fig. 401)______________________________
 A.  References
 (1)  
25-22-03/401, Upper Deck Ceiling Panels

 (2)  
33-28-03/201, Upper Deck Window Reveal Light

 (3)  
IPC 25-21-02

 (4)  
WDM 33-28-41

 B.  Access
 (1)  Location Zone
 223 Upper Deck Crewrest, Left
 224 Upper Deck Crewrest, Right

 C.  Procedure
 S 864-002
 WARNING: MAKE SURE YOU REMOVE THE ELECTRICAL POWER FROM THE CIRCUIT
_______ BEFORE YOU DO WORK ON THE AIRPLANE. HIGH VOLTAGES ARE IN THE SIDEWALL LIGHTS CIRCUIT. FAILURE TO REMOVE POWER CAN CAUSE INJURY TO PERSONS.
 CAUTION:_______BE CAREFUL WHEN YOU HANDLE THE PANELS. YOU CAN CAUSE DAMAGE TO THE PANELS, INSULATION BLANKETS, AND LIGHT ASSEMBLIES IF YOU ARE NOT CAREFUL.
 (1)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  P414 Main Power Distribution Center - Left Panel 1) 414L17 UPR DK WNDW REVEAL

 (2)  
Remove the ceiling panel (AMM 25-22-03/401).

 S 034-004

 (3)  
Disconnect the external electrical connector from the light assembly housing on the outboard side of the window reveal panel.

 S 014-003
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 25-21-02
 ALL  ú ú 02A Page 401 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

MISCELLANEOUS  UPPER SUPPORT 
PANEL  REVEAL PANEL  (REF) 
(REF)  SEE  A  SEE  C 
HORIZONTAL CLOSEOUT 
PANEL INSTALLATION 
(REF) 

REVEAL PANELS (REF)
GAP COVER (REF)
SEE B
0.20 INCH (REF)
GAP COVER FWD (REF)
STOWAGE BOX (REF)
GAP COVER B
SUPPORT CHANNEL DADO PANEL FWD AND CLIP (REF) (REF)
SEE D
UPPER DECK SIDEWALL REVEAL PANEL
LIGHTED PANEL
A
A WINDOW REVEAL PANEL (EXAMPLE)
FOAM BLOCKS MAY BE TRIMMED UP
TO 0.20 MAXIMUM AT 411U7101
A
GAP COVER INSTALLATION INTERFACE,
PRIOR TO 411U8001 PANEL INSTALLATION.
Upper Deck Reveal Panel and Shade Installation
Figure 401 (Sheet 1)

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