What was found
WHEN PERFORMING INSPECTION REQUIRED BY PARAGRAPH (A)OF AD94-18-04 R1 FOUND SEVERE INTERGRANULAR CORROSION IN BOTH LT AND RT LOWER SPAR CAPS. CORROSION WAS LOCATED 6 INCHES FROM INBOARD END OF LOWER SPAR CAP TO 18 INCHES FROM INBOARD END. CORROSION HAS PENETRATED THE UPPER SURFACE OF THE SPAR CAPS. THE CORROSION HAS ADVANCED TO EXFOLIATION AND LIFTING OF THE SURFACE HAS OCCURRED. PITTING CORROSION HAS ALSO FOUND ON THE WING SPAR WEB IN THE AREA OF THE CORROSION ON THE SPAR CAPS. THE AIRCRAFT IS A 1946 MODEL AND IT APPEARS THAT THE SPARS ARE ORIGINAL.