Sikorsky Aircraft Corporation

Tapas K Mukherji

Robert J Araujo

Bruce D Hansen

Edward J Karedes

Michael E Dandorph

A method of removing an alpha case from a rotor blade by directing a water jet to mill a surface of a rotor blade spar to remove an Alpha-case therefrom.

Alpha case removal process for a main rotor blade spar

A method of refurbishing a rotor blade utilizing a waterjet and an apparatus therefore.

Refurbishing method and system for a main rotor blade spar

A surface processing method includes the step of increasing a surface hardness of a metal having a nominal composition that includes about 0.21-0.25 wt % carbon, about 2.9-3.3 wt % chromium, about 11-12 wt % nickel, about 13-14 wt % cobalt, about 1.1-1.3 wt % molybdenum, and a balance of iron from a first hardness to a second hardness. For example, the method is used to produce a surface-hardened component that includes a core section having a first hardness between about 51 HRand 55 HRand a case section having a second hardness that is greater than the first hardness.

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Shelton, CT, United States of America

Tapas K Mukherji