What was found
DURING ROUTINE SCHEDULED INSPECTION, FOUND FWD PROP BULKHEAD TO BE CRACKED. THIS IS AN ON GOING PROBLEM WITH THESE COMPONENTS. HAVE SEEN APPROXIMATELY (10) OF THESE BULKHEADS, ALL CRACKED IN THE SAME MANNER. ALL IN THE SAME LOCATION, RIGHT AT THE BEND RADIUS OB OF THE MOUNTING BOLT HOLES, ON DIFFERENT AIRPLANES, ENGINES AND PROPS. BELIEVE THE BEND RADIUS IS TOO SMALL ON THIS PART. ALSO, THE HEAT TREATMENT OR METALURGY MIGHT BE WRONG. (K)