NDE (Nondestructive Evaluation) of Black Hawk Helicopter Rotary Wing-Head Spindle Threads Using Electric Current Perturbation

摘要

Six Black Hawk helicopter rotary wing-head spindles were inspected for flaws in the thread roots using the electric current perturbation (ECP) method. Both new spindles and spindles which had been removed from service were examined. The ECP method was shown to provide much higher sensitivity for detection of surface and slightly subsurface flaws than the presently-used ultrasonic method. In addition, ECP is not influenced by the presence of a tie rod in the spindle bore. A laboratory demonstration of the flaw detection capability of ECP was held for representatives of USAAVSCOM and Sikorsky Aircraft. (rh)