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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CAUTION: DO NOT TIGHTEN THE WINDOW BOLTS MORE THAN TWO FULL TURNS
_______ (720 DEGREES | 60 DEGREES). IF YOU TIGHTEN THE BOLTS TOO MUCH, IT CAN CAUSE THE DELAMINATION OF THE WINDOW.
 (c)  Apply one more 360 degree | 30 degree wrench turn to each bolt
 (3) to complete the window bolt installation.
 NOTE: Window must be aligned to 0.03 inch outboard of the skin
____ and 0.08 inch inboard of the skin.
 I. Apply the Aerodynamic Smoother.
 S 954-028
 (1)  Apply the masking tape adjacent to the areas where you will apply the aerodynamic smoother.
 NOTE: Do not apply sealant between the window and the window
____ post or sills (inside the airplane). Doing so may trap water and encourage corrosion.
 S 394-029
 (2)  Apply the aerodynamic smoother:
 (a)  
Apply a thin brush layer of the silicone primer to the bottom and the sides of the area.

 (b)  
Permit the primer to dry for a minimum of 1 hour at 70°F.

 (c)  
Brush a layer of the silicone primer on a clean, dry nylon cord and permit the primer to dry for 30 minutes.

 (d)  
Install the cord in the groove.

 NOTE: The ends of the cord must make an overlap of 0.5 to 1.0
____ inch when installed around the window.
 (e)  
Push the cord into the groove with a thin blunt hand tool and make an overlap with the two ends in the top aft corner.

 (f)  
Make sure the ends of the cord is correctly against the frame at all points on the cord.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

NOTE:CONTINUE IN THIS PATTERN. ALWAYS GO TO A FASTENER FOR THE WINDOW. THAT IS IN THE MIDDLE OF TWO INSTALLED FASTENERS. YOU PERMITTED. MUST GO TO A SIDE OTHER THAN THE SIDE ON WHICH A FASTENER WAS JUST TIGHTENED. DO THIS AS EARLY IN THE
POSSIBLE.

FWD

NO. 3 WINDOW
Example Window Fastener Torque Sequence Figure 403
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (g) Apply the aerodynamic smoother as shown in Fig. 402.
 NOTE: You must complete the steps that follow in 2.5 hours.
____
 1)  Use a flow gun to add the mixed aerodynamic smoother to the area.
 NOTE:____You must add the smoother slowly to the area. If you do not fill the area fully, the smoother will shrink too much.
 You can use a spatula when you cannot use a flow gun.
 2)  Use water to make the extra aerodynamic smoother smooth with the outer surface of the skin and the window.
 3)  Remove the masking tape from the edges of the area and remove the protective cover from the outer side of the window.
 NOTE: If aerodynamic smoother is not sufficiently
____ cured (at least 30 durometer), the airplane can be dispatched by applying pressure sensitive aluminum tape such as 3M 428A, 428B, 428C, 425 or Y9162. Remove the tape as soon as possible after the minimum cure time.
 4)  If the aerodynamic smoother lifts up at the edges of the area, you can make it smooth with a tool.
 J.  Put the Airplane to Its Initial Condition (Fig. 401)
 S 414-030
 (1)  Install the wire support brackets removed from the bottom of No. 3 window.
 S 434-031
 CAUTION: MAKE SURE THE CODES OF THE LEADS AGREE WITH THE TERMINAL
_______ (WDM 30-41-21). INCORRECT CONNECTIONS CAN CAUSE DAMAGE TO THE WINDOW CIRCUITS AND THE WINDOW.
 (2)  
Connect the two power leads to terminals (11) at the aft edge of the No. 2 window or the forward edge of the No. 3 window. Tighten the fasteners to 25 - 30 pound-inches.

 S 434-032

 (3)  
　
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