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The resins, hardeners and solvents used for composite repairs are poisonous. You must not take food into the work area. Use a mask to protect your face and use eye-protection.
WARNING:  DO NOT GET RESINS, HARDENERS OR SOLVENTS IN YOUR MOUTH OR IN YOUR EYES. THESE CHEMICALS CAN CAUSE DISEASE.
When you grind composites you make small particles of composite dust. These particles can irritate the skin and eyes. If you breathe these composite particles, they can cause lung disease.
When you grind composite you must always use a protective cream on your hands and on all exposed skin. Wear overalls which seal at the wrists, neck and ankles. You must always wear gloves and if necessary, change them often. Use a suitable mask to protect you face and lungs. Always wear safety goggles to protect your eyes.
If your skin comes into contact with composite dust, then wash it off with flowing water. Do not rub your skin while it has dust on it.
WARNING:  DO NOT GET COMPOSITE DUST PARTICLES IN YOUR EYES, OR IN YOUR MOUTH, OR ON YOUR SKIN. THESE PARTICLES CAN CAUSE DISEASE.
Page 2 Doc # 6.02.01 09 Jan 2003 Rev. 4
51-20-00
AMM
Structures

7. Workshop Conditions
Keep the workshop clean and free from dust. Remove grinding dust as it occurs. The working area must not be affected by draughts.
The temperature of the workshop should be maintained between 18 °C (65 °F) and 27 °C (77 °F) and must not fall below 15 °C (59 °F). The relative humidity during mixing, applying or curing or resins must not be allowed to rise above 80 %.
Maintain the workshop temperature as near to 25 °C (77 °F) as possible during curing.
Doc # 6.02.01 Page 3
Rev. 4 09 Jan 2003

51-20-00
Structures
AMM

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51-20-00
AMM
Structures

Maintenance Practices
1. General
These maintenance practices tell you about composite repair processes and how to repair Class 2, 3 and 4 damage to the composite structure. Refer to Section 51-10 for data about damage classification. Class 1 damage may only be repaired in accordance with a repair scheme approved by the manufacturer. All repairs must be carried out by approved persons.
You must only use the materials approved by the manufacturer when repairing the airplane. Refer to Section 51-30 for data about approved materials.
Inspect the damaged area. Look specially at the adjacent structure. Damage can go a long way under the surface. Use the techniques given in Section 51-10.
You must take care to do the repair correctly. The outer shell of a composite structure is stressed. Failure of the structure can cause an accident.
2. Resin
You must use the correct quantity of mixed resin for the repair. Weigh all the cut cloth patches that you will use for the repair. The ratio for glass cloth to mixed resin is 100 : 70. For example, 100 grams of dry glass cloth require 70 grams of mixed resin. The ratio for carbon cloth to mixed resin is 100 : 85. For example, 100 grams of dry carbon cloth require 85 grams of mixed resin.
Measure the quantities of resin and hardener accurately (± 0.5 % by weight). Mix the resin and hardener thoroughly before laminating, or adding fillers or other additives.
Always use clean containers for mixing resin and only mix as much resin as you can use within its “working life”.
When using a large quantity of resin put it into a shallow container. This will increase the ratio of surface area to volume which will reduce the risk of an exothermic reaction.
3. Glass and Carbon Cloth
You must always use the correct cloth for the repair. Refer to the lay-up drawing of the repair area for data about the type of cloths you must use. The lay-up drawing will tell you:
) The correct type of cloth.
) The fiber direction.
) The dimensions of the layer.
Make sure that the fibers in each layer of cloth point in the direction given in the lay-up drawing. This gives the correct strength to the laminate.
　
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