Scattering of a plane wave with linear polarization by a chiral-coating conducting sphere is presented. The expressions for the expansion coefficients of scattered fields and internal fields are obtained. The achiral-coating and the bare sphere limiting cases for these formulas are examined. The monostatic and bistatic radar cross-section (RCS) for three different chiral media: a lossless dielectric chirality, a loss dielectric chirality and a loss magnetic chirality are shown.