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3/3 no expanded 74 DEFECT SIGNAL adjacent scan tracks Amp mV angle apparent approximately arrow axial location boundary layer centerline Circ compressible flow Cont'd CORRESPONDING DEFECT defect location Defect Signal depth Endurance Testing expanded record FERROMAGNETIC Figure 14 Figure 23 a-b inch inclusion nucleated inclusions located initial inner bearing races inner races inspection records Lina Linagraph magnetic perturbation inspection MAGNETIC PERTURBATION SIGNAL Magnetic Record metallurgical microcracking observed opposite polarity signals oscilloscope Outer race particles peak separation Photo photomicrograph shows PLASTIC ZONE SHIFT plastically deformed pre-endurance prior to endurance PROBE TYPES raceway surface RECORDS WITH EXPANDED RECORDS WITH TYPICAL Remarks 3/3 rolling track run-in cycles Scribe Lines SEQUENT TO ENDURANCE shear stresses shown in Figure signal amplitude Signal Characteristics signal locations signal source spalled regions SPECIMEN 74 subroutine Subsurface Inclusion surface flaw surface incl SURFACE INDENTS TYPICAL SIGNALS PRIOR Typical Signals Sub Void Opposite void polarity signals