747-400 AMM 飞机维护手册 STANDARD PRACTICES - AIRFRAME(59)

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A
747-400 MAINTENANCE MANUAL
 S 424-015
 (2)  To apply decals to irregular surfaces, do these steps:
 (a)  To apply decals on a joint between two surfaces which move with respect to each other, do one of these steps: 1) For distances of 0.100 inch and more, cut the decal at the
 approximate center of the distance. Wind the decal around the two edges. See Procedure A (Fig. 401).
 2)  For distances of less than 0.100 inch, cut the decal aligned with the forward or top skin edge. Wind the decal around the aft or bottom skin edge. See Procedure B.
 (b)  
To apply decals across lap joints, do one of these steps: 1) Wind the decal smoothly and continuously around the edge of the lap joint. See procedure C (recommended procedure).

 2)  You can use this alternative where the decal extends along the lap joint for a long distance. Cut the decal aligned with the overlap edge and touch the remainder of the decal to the overlap edge. See Procedure D.

 (c)  
To apply decals to external emergency exit handles, see Procedure E. 1) Before you remove the backing paper, put the decal on the

 handle and cut the decal overlap around each rounded corner. 2) Remove the backing paper and apply the decal. Push the overlap around the edges of the handle.

 (d)  
Use tool ST732 to cut decals, except pressure-sensitive Polyester, around the heads of fasteners on removable panels. Push the decal into the recessed slot.

 (e)  
Cut and remove an area of film, of pressure-sensitive polyester decals, and approximate size of a nonflush rivet or fastener, with a Scotchcal cutter. Push the decal film firmly in position around the rivet or fastener.

 (f)  
Let the adhesive cure for 1/2 hour before you seal the edges.

 (g)  
Make a small hole in the decal film, with a sharp pointed instrument, at each rivet on decals applied over pressurized areas.

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747-400 MAINTENANCE MANUAL
CUT DECAL AT APPROX

METHOD A

 

CONFORMATION TO CORNER RADII
METHOD E Decal Application Over Irregular Surfaces Figure 401
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747-400 MAINTENANCE MANUAL
 S 804-016
 (3)  
To remove carrier, or premask and masking tape, pull back parallel to the decal surface. If you will paint the adjacent area, leave the premask in position.

 S 394-017

 (4)  
Seal the edges.

 (a)  
If you painted up to the edges of decals, seal the edges of the decal with paint. 1) If the decal has a premask, remove the premask only after

 you apply the last layer of paint up to the decal. The paint will flow sufficiently well to seal the edges. If this condition does not occur, seal the edges by the recommended procedure.

 (b)  
Use a brush to apply clear base 683-3-2 with X-310A catalyst (edge sealer) to the edges of the decals that follow. Make sure you have a dry film thickness of 0.0015 to 0.0020 inch (AMM 51-24-02/701). 1) Solvent-activated vinyl decals 2) BMS 10-26, Type 1 and 3 pressure-sensitive elastomeric

 vinyl decals 3) Solvent-activated reflective decals 4) Pressure-sensitive reflective decals 5) Pressure-sensitive aluminized, mylar decals

 (c)  
Let adhesive cure for a minimum of 1/2 hour, then seal the edges of pressure-sensitive polyester decals with clear base 683-3-2 and X-310A catalyst (edge sealer) (AMM 51-24-02/701).

 (d)  
Use a brush to apply the applicable color of BMS 10-11, Type 2 enamel on all open exposed rivet or fastener heads on pressure-sensitive polyester decals. Make an overlap on the edge of the decal of 1/4 inch.

 (e)  
Use a brush to apply RFE96J edge sealer to the edges of the reflective (fluorescent) vinyl decals. Make sure you have a dry film thickness of 0.0015 to 0.0020 inch.
　
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