What was found
SUPPORT REMOVED FOR SMALL CRACK IN UPPER FLANGE. UPON REMOVAL OF CABIN AIR INLET DUCT FROM FORWARD BULKHEAD, FOUND SUPPORT COMPLETELY SEVERED AT POINT SUPPORT PASSES THROUGH TUNNEL ASSY AND ATTACHES TO KEEL. SAME CONDITIONS FOUND ON RT SIDE ALTHOUGH NOT AS OBVIOUS. ENGINE MOVEMENT CAUSED NUMEROUS CRACKS IN FORWARD BULKHEAD, AND CHAFING OF ROCKER COVERS TO LT SIDE COWL. NO EVIDENCE OF CONTRIBUTING FACTORS FOUND IN LOGS. DESIGN OF LATER MODEL SUPPORT ASSYS INCREASED THE WEB AREA ATTACHING TO THE KEEL.