747-400 AMM 飞机维护手册 结构 STRUCTURES(78)

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 WHEN YOU APPLY THE AERODYNAMIC SMOOTHER TO THE WING-TO-BODY FAIRINGS, LIMIT YOUR APPLICATIONS TO THE LOCATIONS SHOWN IN AMM 51-41-00. THE CLEARANCES BETWEEN THE FAIRING PANELS ARE MADE TO LET THE FLUIDS IN THE FAIRING TO DRAIN OVERBOARD.
 (3)  
Apply the aerodynamic smoother with a flow gun or spatula. Make sure there are no air bubbles when you apply the aerodynamic smoother.

 S 392-078

 (4)  
Apply more of the aerodynamic smoother, if it is necessary, to make the edges around the seal smooth.

 NOTE: Because of shrinkage, you must apply the aerodynamic
____ smoother again, approximately 8 hours apart, to fill the clearances.
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747-400
MAINTENANCE MANUAL

Aerodynamic Sealer
Figure 206 (Sheet 1)

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747-400
MAINTENANCE MANUAL

SLOT WIDTH AND DEPTH 
WIDTH "A" (INCHES)  WIDTH "B" (INCHES) 
0.02 - 0.03 0.03 - 0.05 0.05 - 0.10 0.10 - 0.15  0.10 MAXIMUM 0.25 MAXIMUM 0.50 MAXIMUM 0.75 MAXIMUM 

Aerodynamic Sealer
Figure 206 (Sheet 2)

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 S 392-079
 (5)
Use a spatula to make the seal smooth with the masking tape.

 S 952-080

 (6)  
Remove the masking tape after the seal is smooth or let the masking tape stay during the curing time.

 S 392-081

 (7)  
Make the edges of the seal smooth. Remove all the unwanted compound with a wooden or plastic tool.

 TASK 51-31-01-392-082
 10. Electrical Fitting Seal Application___________________________________
 A. General
 (1)  BMS 5-37 sealant is the recommended sealant for the electrical seal fittings. BMS 5-26, BMS 5-32, and BMS 5-95 sealants will do the same function as the BMS 5-37. But, BMS 5-26, BMS 5-32, and BMS 5-95 are not the recommended sealants because they will bond to electrical wires which do not have a teflon coating. For wires that are not teflon coated it is not easy to do maintenance on electrical seal fittings that have sealant bonded to the electrical wires. For wires with a teflon coating do not use BMS5-37, use BMS5-26.
 B. Equipment
 (1)  
Fillet Fairing Tools

 (2)  
Sealant Removal Tool - made from wood or
 plastic 3/16 inch thick, 8 inches long in 1/4,
 1/2 and 3/4 inch widths.

 (3)  
Spatula made of wood or plastic

 (4)  
Sealing gun and nozzles

 C. Consumable Materials
 (1)  G00138 Masking Tape - Permacel No. 70 or 85,
 American Tuck No. 210; 3/4-inch wide and
 1 1/2-inch wide

 D. Procedure
 S 302-083
 (1)  
Do the Prepare for Sealing task.

 (2)  
Put the wire bundle through an available cutout.

 S 422-096
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MAINTENANCE MANUAL

 S 412-097
 (3)  Isolate the wires before you apply the seal:
　
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