What was found
CORROSION UNDER ADF ANTENNA ON THE TOP OF THE FUSELAGE AT FS 409.00+64.000 - 409.00+86.750 BL 0-5.3000 - BL 0+5.000: AIRCRAFT REMOVED FROM SERVICE. REMOVED CORROSION BY BLENDING TO A SMOOTH CONTOUR ON 6 DAMAGE AREAS ON TOP OF FUSELAGE FS 409.00+64.000 - 409.00+86.750 BL 0-5.3000 BL 0+5.000: P1: FS 409.00+64.000 - FS 409.00+69.000 BL 0+3.000 - BL 0+5.000 5.0 L X 0.200 W REMAINING THICKNESS 0.54 P2: FS 409.00+72.200 - FS 409.00+73.300 BL 0+5.000 1.1 L X 0.160 W REMAINING THICKNESS 0.054 P3: FS 409.00+85.800 - FS 409.00+86.750 BL 0+1.300 - BL 0+.0900 0.950 L X 0.100 W REMAINING THICKNESS 0.045 P4: FS 409.00+85.400 - FS 409.00+86.200 BL 0-1.900 - BL 0-1.400 .0800 L X 0.043 W REMAINING THICKNESS 0.043 P5: FS 409.00+67.300 - FS 409.00+69.900 BL 0-5.000 - BL 0-5.300 2.300 L X 0.175 W REMAINING THICKNESS 0.054 P6: FS 409.00+64.000 - FS 409.00+66.700 BL 0-2.700 - BL 0-4.800 3.3 L X 0.150 W REMAINING THICKNESS 0.054 PERFORMED HFEC ON BLENDED AREAS P1 - P6 WITH NO INDICATION NOTED. EVALUATED BLENDED AREAS P1 - P6 AND FOUND TO BE WITHIN LIMITS REF SUPPLEMENT NO: 16-368A DATED 11/28/2017.