What was found
2 AREAS OF CONFIRMED CORROSION ON VERTICAL STAB SPAR RT AFT SPAR CLIP. MECHANICALLY AND HAND SANDED 1 AREA OF CORROSION LOCATED ON VERTICAL STAB RT AFT SPAR CLIP ON UPPER END AT 1ST RIVET AND 1 AREA OF CORROSION LOCATED 3RD RIVET BELOW UPPER RUDDER HINGE ON RT SPAR CLIP ON AFT SPAR VERTICAL STAB. FOUND CORROSION BLENDS TO BE EXCEEDING C680 SRM 51-70-02 LIMITATIONS OF NO MORE .002" OF NOMINAL MATERIAL MATERIAL ALLOWED. SUBMITTED FINDINGS TO ENGINEERING. REPAIRED CORROSION BLENDS, IAW TEXTRON ENGINEERING MEMO, REF DQ28042M1 SUBJECT: VERTICAL STABILIZER AFT SPAR CAP CORROSION DATED: DECEMBER 4, 2020. NO ADDITIONAL RIVETS REQUIRED REPLACEMENT BEYOND RIVETS REMOVED AND NO VISUAL CORROSION IDENTIFIED INSIDE RIVET HOLES WHERE RIVETS WERE REMOVED.