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Crack detecting means for rotor blades of rotary wing aircrafts

  • US 4,026,660 A
  • Filed: 04/13/1976
  • Issued: 05/31/1977
  • Est. Priority Date: 04/15/1975
  • Status: Expired due to Term
First Claim
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1. In rotary wing aircrafts including a stationary part and at least one rotor assembly having plurality of rotor blades, means for detecting cracks in the rotor blades, said detecting means comprising crack sensing means associated with each rotor blade so as to provide a change in an electrical property when a crack is produced in the rotor blade, first induction means provided on the rotor at least one for each rotor blade and connected with said crack sensing means to form circuit means of which impedance is changed in accordance with the change in the electrical property in the crack sensing means, second induction means provided on said stationary part of the rotary wing aircraft and adapted to cooperate with said first induction means, means for applying alternating power to one of the first and the second induction means to produce an output signal at the second induction means, means for discriminating the output signal of the second induction means to determine whether there is a crack in the rotor blade.

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