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747-400
MAINTENANCE MANUAL

(EXAMPLE)
SPANNING STRAP

THIS DIMENSION CAN CHANGE FOR EACH LOCATION
MAKE THE SPANNING STRAP FROM 0.040-INCH THICK 2024 T3/T4 ALUMINUM ALLOY APPROXIMATELY 0.75-INCH WIDE. DRILL AND COUNTERSINK (2 LOCATIONS) FOR TWO 100` COUNTERSUNK HEAD BACB30NN4C19 BOLTS
SMOOTH THE EDGES TO PREVENT DAMAGE TO THE WIPER BLADE AND THE AERODYNAMIC SMOOTHER
Spanning Strap Fabrication Figure 406
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MAINTENANCE MANUAL

[5] FOAM INSULATION  [8] FOAM INSULATION
B-B  C-C
Installation of Foam Insulation on Window Structure Figure 407
E82632
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747-400 MAINTENANCE MANUAL
 S 094-034
 (14)
 Remove the sling.

 S 374-061

 (15)
 Apply a layer of a corrosion preventive compound to the plugs.

 S 414-062

 (16)
 Install the plugs in the sling attach holes with a flushness tolerance of 0.01 inch of the frame.

 I.  Apply the Aerodynamic Smoother
 S 954-036
 (1)  
Apply tape to the two sides of the clearance between the windshield ledge and the frame.

 S 434-063

 (2)  
Install the nylon cord into the clearance around the window.

 S 214-064

 (3)  
Make sure the nylon cord is tightly installed in the bottom of the clearance.

 S 394-037

 (4)  
Do the steps that follow to apply the aerodynamic smoother:

 (a)  
Put the mixed aerodynamic sealant into the clearance. Apply it slowly to make sure the clearance is fully filled.

 (b)  
Remove the unwanted aerodynamic sealant until it is smooth with the external surface of the window and frame.

 (c)  
Remove the tape and the protective paper from the windshield.

 (d)  
Make it smooth at the edges of the clearance.

 S 424-085
 (5)  AIRPLANES POST-SB 21-2347;
 Install the foam insulation on the No. 1 window structure:

 (a)  
Clean the inside of the No. 1 window structure with Aliphatic Naphtha solvent.

 (b)  
Trim the foam insulation as follows:

 1)  Trim the foam insulation to clear the forward and aft electrical terminals.
 2) Make sure the foam insulation does not touch the forward and aft electrical terminals. 3) Trim the foam insulation to clear the airplane structure as necessary.
 (c)  Install the foam insulation on the the No. 1 window structure.
 NOTE: If the foam insulation will not attach to the structure,
____ attach the foam as shown in the Standard Overhaul Practices Manual SOPM 20-50-12, Type 79.
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 J. Put the Airplane Back to its Usual Condition
 S 414-038
 (1)  Install the lightshield assembly (Ref 25-13-01/401).
 S 864-068
 CAUTION: HOLD THE HEAT TERMINAL BLOCKS WHEN YOU TIGHTEN OR LOOSEN THE
_______ SCREWS. THIS WILL PREVENT DAMAGE TO THE TERMINALS ON THE WINDSHIELD.
 (2)  
Connect the electrical wires to the bus bars. Tighten the fasteners with a maximum torque of 25-30 pound-inches.
　
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