The detrimental effects of some meteorological phenomenon such as wind shear, thunderstorm, ice/snow etc, to aviation safety are relatively well known. But aerodynamic influences due to heavy rain are still the on-going research subject, and needs further investigation. This paper first review some research finding of heavy rain effects on aerodynamic performance degradation. Then an analytical method to compute the two-dimensional heavy rain condition is introduced and some preliminary results are discussed. It is felt that the quantitative information gained in this work could be useful to the operational airline industry, and greater effort should put in this direction to further improve aviation safety.
