<p>An analytical assessment of the influence of the number of blades and the diameter of the propeller on the certification noise levels of light propeller-driven aircraft has been performed. Increasing the number of blades is one of the most effective ways to reduce community noise of light propeller-driven aircraft, and this effect can be quantified analytically according to the methodology described in this paper. A good agreement was obtained between the analytical assessment data and the experimental results of certification tests. The proposed procedure is based on expressions previously obtained by the author on the basis of semiempirical noise theory to assess the effect of the number of blades and diameter on the sound power of the tonal components of propeller noise from aerodynamic load and thickness.</p>