What was found
LOWER FUSELAGE SKIN AT TCAS ANTENNA LOCATION CORRODED AROUND HOLE CUT-OUT. C-CHECK RO 10/9/2020. BLENDED OUT CORROSION AND EVALUATED LOWER FUSELAGE SKIN AT TCAS ANTENNA LOCATION HOLD CUT-OUT AND FOUND TO BE OUT OF LIMITS, REF CRJ-900 SRM AND CRJ-900. REPAIRED LOWER FUSELAGE SKIN BELOW TCAS ANTENNA BETWEEN FS 295.00 & FS 310.00 AND STR 26L & 26R, REF MHIRJ REO. COMPLIED WITH SKYWEST TASKCARD. SEE CONTINUATION CARD FOR DETAILS. STEPS PERFORMED ON CORROSION TO TCAS DOUBLER REPAIR PERTAINING TO MHI RJ REO.