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Composites and Windshields |
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The link below is more about repairing fiberglass, other composites and windshields. As an IA you may be refered to regarding
the correct procedure for repair or be asked to inspect a repair in progress, AC43b will aid in that process
When inspecting composites one should use the tap test, the handle of a screwdiver would be most ideal. Tap the skin and check for a sharp report.
Any dull sound is an indication of delamination and should be investigated furter. Cracks can appear in "Gell Coat" or other
surface finishes, these can allow water to enter and the subsequent development of mould which can cause a breakdown in the matrix. Cracks can occur around stressed areas or areas involved in hard knocks
similar to the wing hitting a hanger door.
Check all areas vunerable to knocks especially the leading edges and tail surfaces, tap the entire aircraft and wings.If the aircraft owner is a bit touchy about a hard object being used
remind him you are only ensuring his safty, or alternativly use your fingrt tips to tap the surface but remember they will help to dull the report so listen carefully. Windshields should not be so scratched as to cause vision loss or serious sun strike, none the less they can be polished bck to acceptable levels, the method for this is described in the following AC. |