TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 51 Standard Practices Structure
Issue: 28.FEB 2017
Page 155
Number of needed stiffener layers depends on depth of damage. Each
layer of the mentioned fabric represents at proper saturation by
matrix resin thickness of 0.5 mm (0.020 in).
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Prepare (cut out) stiffener layers gradually from the smallest (the
lowest) up to the bigger (upper), each with overrun of 19 mm
(0.75 in).
Putting Layers
▶
Prepare lamination mixture (for recommendation of material see
Table 5).
▶
Apply to the place of repair by means of rigid brush.
▶
Lay the first stiffener into the deposit and saturate it again by brush.
▶
Lay and saturate another layer of stiffener.
▶
When putting the last layer ensure a proper saturation and
compression of stiffeners so that they cannot „come up" to the
surface, which could cause damage at final grinding.
▶
For better saturation of the surface by resin and securing against
curtaining put PE or PP transparent foil across the surface.
▶
Ensure the layer is without bubbles.
Repair thickness should exceed surrounding surface in this phase by
about 0.5 to 1 mm (0.02 in to 0.04 in) for finishing.
Sanding
DANGER Explosion hazard due to abrasive dust.
▶
Remove adhesive and dope only in explosion proof rooms with
exhaustion device.
WARNING Poisoning hazard due to abrasive dust.
▶
Wear externally ventilated protective clothing, protective goggles,
chemical resistant gloves and respiratory mask when removing
adhesive and dope.
Basic material of the part must not be diminished when sanding.
