Page 204 Doc # 6.02.01 09 Jan 2003 Rev. 4
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AMM
Structures
DA 40 Series
Detail Steps/Work Items Key Items/References
(10) 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.
(11) Do steps 9 and 10 as necessary until all the layers of cloth are in place.
(12) Apply a thin coat of resin to the area of the repair on the structure where you will attach the laminate patch.
(13) Put the laminate patch carefully into position on the structure using the transparent sheet. Make sure that the fibers in the cloths point in the correct direction.
(14) Carefully remove the transparent sheet from the laminate patch.
(15) Use a roller to make sure that the laminate patch is firmly in position and that any excess resin is removed from the repair laminate.
(15) Put a layer of peel ply over the laminate.
(16) If necessary, apply a vacuum bag to the laminate. Refer to the lay-up drawing and/or repair drawing.
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Structures
AMM
Table 1 - Bonding Paste Mixing Table
Material Weight in Grams
Mixed Resin 50 100 150 200 250 300 350 400 450
Cotton Flocks 6 11.5 17 23 29 34.5 40 46 52
Aerosil 1.4 2.8 4.2 5.5 6.9 8.3 9.7 11.1 12.5
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AMM
Structures
6. Bonding Paste (Thickened Resin)
Use bonding paste to bond GFRP/CFRP components together and in the repair of sandwich cores. Resin and thickening fillers make bonding paste. Table 1 gives you the proportions by weight of resin to thickening fillers. You can change the proportions of Aerosil and Microballoons relative to each other but you must keep the total weight of the Aerosil/Microballoon mix constant.
7. Curing
You must cure a composite structure to make it strong. If you do not cure a composite structure correctly it may fail. Curing is a 2 part process, pre-curing and post-curing. The following procedure gives a typical curing process.
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