As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BULKHEAD REPLACED IN THE FIELD AND RETURNED FOR WARRANTY CLAIM. BULKHEAD IS CRACKED FROM CENTER HOLE OUTWARD AT APPROXIMATELY 45 DEGREES FOR 4 INCHES. CRACK STARTS .5 INCH TO THE SIDE OF MOUNT HOLE FOR ATTACHMENT TO PROP HUB. BULKHEAD IS .075 INCH ALUMINUM, SINGLE LAYER SUPPORTING 18 INCHES DIAMETER SPINNER. SUBMITTER SUSPECTS BULKHEAD NEEDS DOUBLER. HAVE SEEN CRACKS ON OTHER BULKHEADS INSTALLED ON CESSNA 414A MODIFIED PER STC SA7633SW. (X)