What was found
DURING FLUORESCENT PENETRANT INSPECTION OF SWASHPLATE ASSY, UPPER RETAINER FOUND TO HAVE 5 CRACKS. MECHANICAL TESTING, METALLURGICAL & CHEMICAL ANALYSIS PERFORMED ON A SUBJECT RETAINER & FOUND TO MEET HARDNESS & ELECTRICAL CONDUCTIVITY REQUIREMENTS. THE PART MEETS CHEMISTRY REQUIREMENTS & MICROSTRUCTURE WAS TYPICAL FOR THE HEAT TREATED CONDITION. RECURRING FAILURE WITH THE CRACKS ALWAYS LOCATED IN THE GROOVE WHICH IS AN OPTIONAL FEATURE FOR THIS PART.THE GROOVE CORNER RADII ACT AS STRESS RISERS, OPERATIONAL LOADS PLUS LOADS INDUCED DURING ASSEMBLY MAY INDUCE CRACKING. ENGINEERING DRAWING CALLS OUT FOR THE GROOVE IS OPTIONAL. MANUFACTURER WILL SPECIFY THE GROOVE NOT BE MACHINED IN THE PART.