What was found
DURING ANNUAL INSPECTION THE FORWARD SPINNER BULKHEAD WAS FOUND TO BE CRACKED AROUND 5 OF THE SIX BOLT HOLES. THINK THAT THE CAUSE OF THE PROBLEM IS THAT WHEN THE PROP MOUNTING BOLTS ARE TORQUED TO THE LIMITS GIVEN IN THE SRM THAT THE FORWARD BULKHEAD GET PULLED DOWN SLIGHTLY INTO THE CHAMFER OF THE PROP BOLT HOLES AND THIS IN TURN STRESS THE PART LEADING TO CRACKING. TO SOLVE THIS PROBLEM, THINK THAT THE POSSIBILITY OF DIMPLING OF THE BOLT HOLES MIGHT CORRECT THE CRACKING. (K)