What was found
STIFFENER HAS BEEN REPLACED 4 TIMES IN APPROXIMATELY 90 HOURS. EACH TIME IT CRACKS IN THE SAME AREA IN THE SAME WAY. ALL OTHER ATTACHING PARTS ARE NEW. IT APPEARS METAL IS TOO LIGHT OF A GAUGE OR IT IS BEING IMPROPERLY HEAT TREATED OR BOTH. CESSNA OFFERS CREDIT ON TWO OF THESE BUT HAS NOT IMPROVED PART OR OFFERRED A SOLUTION. ALL COWL MOUNTS ARE NEW AND ENGINE SHOWS NO SIGN OF VIBRATION TO CAUSE THIS CRACKING OF PART. THE ONE ON THE LEFT HAS OVER 90 HRS WITH NO SIGN OF CRACKING.