What was found
MOUNTING PLATE FOR RADIO ALTIMETER #2 FWD ANTENNA ON AFT FUSELAGE IS SEPARATING FROM THE AIRCRAFT. CORROSION FOUND BETWEEN MOUNTING PLATE AND SKIN OF FUSELAGE. NO CORROSION FOUND ON THE FUSELAGE ONLY MOUNTING PLATE. AFTER CLEANING CRACKS WERE FOUND ON THE FUSELAGE SPIDER WEBBING FROM THE RIVET HOLES, WITH LONGEST ONE BEING 0.3 INCHES IN LENGTH. SUPPLIMENTAL INFORMATION: REAR FUSELAGE LOWER SKIN CRACK AND CORROSION BETWEEN FR65-66 AND STR 21R-21L. REPAIRED LOWER SKIN BETWEEN FR65-66 AND STR 21R-21L IAW EO-EMB145-53-065-R1.