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Structures
AMM

Only use sharp shears or scissors to cut the cloth to size. Make sure that the fibers in the cut cloth point in the correct relative direction. Make sure that the fiber strands are not broken or damaged. The cloth must be free of any damage or contamination.
4. Core Material
You must always use the correct sandwich core for the repair. Refer to the lay-up drawing of the repair area for data about the type of core you must use.
Make sure that the core material is not damaged or contaminated.
Use a sharp knife to cut the core to the exact size for the repair. The edges of the cut must be clean so that the core will bond correctly. You can profile the core by cutting or sanding.
5. Laminating
A prescribed stack of resin impregnated cloth makes a laminate. A laminate which is used to repair an airplane becomes an integral part of the airplane structure once the laminate is hardened and fully cured.
You can make the laminate in place directly on the repair or you can make the laminate on a work table and then apply the wet laminate to the repair. When you make the laminate on a table:
) It is easier to do.
) It is easier to control and correct the laminating process.
) You can make sure that the cloth layers in the stack are correct before you apply the resin.
) You can make the repair neater.
) You do not have to work upside down.
A. Laminating in Place
Detail Steps/Work Items  Key Items/References 
(1)  Prepare the damaged area for laminating. Make sure that the repair is clean and free contamination.  Refer to the relevant repair procedure in this Section. 
(2)  Prepare the layers of cloth that you will use.  Refer to the lay-up drawing. 

Page 202 Doc # 6.02.01 09 Jan 2003 Rev. 4
51-20-00
AMM
Structures

DA 40 Series

Detail Steps/Work Items  Key Items/References 
(3)  Protect the area of the structure around the repair from contamination by the repair materials.  Use plastic/polythene sheet material held in place by self adhesive tape. 
WARNING: DO NOT GET RESIN ON YOUR SKIN. RESIN CAN CAUSE SKIN DISEASE. WARNING: DO NOT GET RESINS, HARDENERS OR SOLVENTS IN YOUR MOUTH OR IN YOUR EYES. THESE CHEMICALS CAN CAUSE DISEASE. 
(4)  Apply a thin coat of resin to the repair. 
(5)  Apply the first layer of cloth to the repair and trim to the correct size.  Make sure that the fibers in the cloth point in the correct direction. 
(6)  Use a roller, squeegee and a stipple brush to remove all trapped air. Make sure that the cloth is completely impregnated with resin. If necessary, add more resin. 
(7)  When the excess resin has been brought to the surface with the rolling and stippling process, apply the next layer of cloth. Trim the cloth to the correct size.  Make sure that the fibers in the cloth point in the correct direction. 
(8)  Do steps 6 and 7 as necessary until all the layers of cloth are in place. 
(9)  Use the roller and squeegee to remove the excess resin. 
(10)  Put a layer of peel ply over the laminate. 
(11)  If necessary, apply a vacuum bag to the laminate.  Refer to the lay-up drawing and/or repair drawing. 

51-20-00
Structures
AMM

B. Laminating on a Table
DA 40 Series

Detail Steps/Work Items  Key Items/References 
(1)  Prepare the damaged area for laminating. Make sure that the repair is clean and free from contamination.  Refer to the relevant repair procedure in this Section. 
(2)  Protect the area of the structure around the repair from contamination by the repair materials.  Use plastic/polythene sheet material held in place by self adhesive tape. 
　
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