![]() ![]() Tropical cyclones, however, are a different issue. ![]() Light, non-pressurised aircraft may find the heaviest rain rates allow water ingestion into the cabin/cockpit/engine compartments with subsequent risks to electronic equipment.Ĭivil airliner engines are tested and certified to ensure that engines will normally not ‘flame out’ under conditions of intense rainfall and water ingestion. Windscreen wipers (if fitted) may not be able to fully cope with the rainfall rate. However, in addition to any true meteorological reduction of visibility, raindrops impacting the windscreen/canopy will additionally reduce visibility. Heavy or very heavy rates of rainfall will clearly have a detrimental impact upon general visibility. For aviation purposes, rain rates are essentially a measure of rain water content. Terms such as ‘very heavy’ have no official definition, but they and terms like them will be used below to describe rainfall rates much greater than normally expected, and would be associated with thunderstorm activity. Showers are further classified as being violent if the rate exceeds 50 mm per hour, although these are normally considered to be rates typical for tropical regions. While there is no agreed international definition regarding rainfall intensity, some use the following criteria: Heavy rain is defined as rates in excess of 4 mm per hour while heavy showers are defined as rates in excess of 10 mm per hour. ![]()
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