Method and apparatus for detecting cracks in helicopter rotor blades
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Jun 26, 1989
filing date -
Jul 4, 1988
priority date (Note) -
Expired
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Abstract
A method for detecting a crack in the main load bearing spar of a hilicopter rotor blade consists of attaching a capillary tube along an external surface of the spar and connecting the interior of the tube to a supply of colored liquid contained in a reservoir at a root end of the blade, whereby a crack in the spar causes a corresponding crack in the capillary tube resulting in visible leakage of the colored liquid.
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