What was found
DURING ANNUAL INSPECTION AND GEAR SADDLE INSPECTION PER AD 76-14-7R2, THE OUTBOARD LT TUNNEL ASSEMBLY WAS FOUND CRACKED OUT FROM AN INSPECTION HOLE TO THE OUTER SKIN. THE CRACK STARTED JUST AFT OF A FACTORY INSTALLED DOUBLER PLATE. THE GEAR SADDLE ON THIS SIDE WAS ALSO FOUND TO HAVE A CRACK, REPLACEMENT OF BOTH PANEL AND SADDLE WERE ACCOMPLISHED. SUBMITTER STATED CAREFUL INSPECTION AT ANNUAL OR 100-HOUR INTERVALS WOULD DETECT THIS TYPE CRACK BELIEVED TO BE CAUSED BY A HARD L ANDING. NO DAMAGE NOTED ON RT SIDE. EXTENSION OF THE DOUBLER WOULD POSSIBLY ELIMINATE THE STRESS CONCENTRATION IN THIS AREA.