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 S 864-020
 WARNING: BE CAREFUL WHEN YOU DO MAINTENANCE ON THE FLIGHT COMPARTMENT
_______ WINDOWS. YOU MUST OPEN THE CIRCUIT BREAKERS AND THE WINDOW HEAT SWITCHES. FAILURE TO DO THIS CAN CAUSE AN ELECTRICAL SHOCK TO PERSONS THAT TOUCH THE WINDOW SURFACES, THE ELECTRICAL TERMINALS AND THE LEADS.
 (2)  
Put the window heat switches in the OFF position.

 S 864-021

 (3)  
Open these circuit breakers and install DO-NOT-CLOSE tags:

 (a)  P6 Main Power Distribution Panel
 1) 6B17 WINDOW HEAT 1R
 2) 6B34 WINDOW HEAT 1L
 3) 6E28 WINDOW HEAT 2L & 3R PWR
 4) 6E30 WINDOW HEAT 2R & 3L PWR

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  P180 DC Power Distribution Panel
 1) 180H12 WDO HEAT CONT 1R
 2) 180H26 WDO HEAT CONT 1L

 S 144-022
 (4)  Remove all the aerodynamic smoother from the window frame and the window.
 S 114-023
 WARNING:_______BE VERY CAREFUL WHEN YOU USE THE ALIPHATIC NAPHTHA. ALIPHATIC NAPHTHA IS FLAMMABLE AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  Clean these surfaces with the aliphatic naphtha:
 NOTE: Use a clean cheesecloth to apply aliphatic naphtha and a
____ clean cheesecloth to remove it. Do not permit the aliphatic naphtha to dry on the surfaces. Clean the surfaces until there is no remaining film. Be careful to not cause damage, or change the shape of the mating surfaces.
 (a)  
The areas where you will apply aerodynamic smoother.

 (b)  
The beaded, molded pressure seal.

 (c)  
The window frame.

 (d)  
The aerodynamic seal.

 (e)  
The fuselage window frame.

 H. Install the No. 2 or 3 Window (Fig. 401)
 S 214-051
 (1)  
Do a visual check of the window post and the sill for cracks and corrosion.

 (2)  
Put the window in the position for installation.

 S 424-024
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-025
 (3)  Install the window fasteners.
 (a)  
Install the window retaining bolts (3) with the sealant adjacent to the bolt head.

 (b)  
Install a rubber washer (4) on each bolt.

 (c)  
Install a metal washer (5) and/or brackets (5) on each bolt.

 NOTE: It is possible you will have to install more metal
____ washers to keep the same bolt grip length.
 (d)  Install the overheat thermostat bracket (9) at the nearest possible location adjacent to the window hot spot.
 NOTE: Do not install metal washers at these locations.
____ Aluminum washers may be added in order to maintain grip length. The hot spot is different on each window. There is a red disk laminated in the window plies at the location of the hot spot. On the No. 2 window, the hot spot is approximately 1.3 inches from the forward edge. On the No. 3 window, the hot spot is approximately 1.3 inches from the aft edge.
 (e)  Install the nuts (6) loosely.
 S 824-026
 (4)  
Align the window in the frame until there is an equal clearance around the window between the window and the frame.

 S 424-052

 (5)  
Tighten the window fasteners.

 (a)  Tighten each nut (6) until it is snug.
 NOTE: The nut is snug when the rubber washer (4) will not turn
____
 freely.

 (b)  Apply one full 360 degree | 30 degree wrench turn to each of the bolts (3).
 NOTE: Follow the sequence to tighten the bolts as shown in
____
 Fig. 403.

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