Method and apparatus for detecting cracks in helicopter rotor bl

Details Method and apparatus for detecting cracks in helicopter rotor bl Method and apparatus for detecting cracks in helicopter rotor bl

1989-06-26

1991-05-14

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73104, 416 61, G01M 322

Patent

active

050145444

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.

REFERENCES:
patent: 3667862 (1972-06-01), Parr
patent: 3691820 (1972-09-01), Fiore
patent: 4104906 (1978-08-01), Oertle
patent: 4135386 (1979-01-01), Peterson et al.
patent: 4373862 (1983-02-01), Ferris et al.
patent: 4376421 (1983-03-01), Skinner

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