What was found
SEVERE CORROSION FOUND DURING ANNUAL. THIS OCCURED SINCE LAST ANNUAL JULY, 1996. CORROSION COULD NOT BE OBSERVED THROUGH INSPECTION HOLES IN WING. CAN ONLY BE SEEN WITH AILERON FULLY IN UP POSITION AND LOOKING UPWARD FROM THE GROUND. IT IS NOT READILY SEEN LOOKING DOWN THROUGH THE GAP BETWEEN WING AND AILERON. SUBMITTER RECOMMENDED OTHER OWNERS INSPECT BEFORE NEXT FLIGHT AND 3 TO 4 TIMES A YEAR THEREAFTER.