Will rainy days affect the take-off and landing of aircraft?

For civil aviation: generally, light rain can fly without affecting normal visibility, except for thunderstorms. Because flying in thunderstorm weather, the plane will have strong bumps, which will easily damage the structure of the plane, and strong lightning will also damage the plane. Therefore, thunderstorms are a serious threat to flight safety. If there is a thunderstorm on the route, it will fly around, and there will be bumps when flying around. At this time, please sit down and fasten your seat belt. In order to ensure flight safety, flights are usually cancelled in thunderstorm weather.

For fighters: unless there is a thunderstorm, they usually fly as usual in rainy days. In order to prepare for the battle, they often choose bad weather for flight training.

The influence of rain on flight

The influence of rain on aircraft can be roughly summarized into three points: first, the water mist brought by rain will affect the pilot's sight distance and hinder the pilot's sight; ? Secondly, it is easy to produce descending airflow in low-altitude airspace (under clouds) in rainy days, which reduces the lift of aircraft and leads to altitude loss; Moreover, it is also the most critical point that the engine absorbs too much rain and is easy to stall. ?

Influence of rain on engine

How to prevent the engine from being damaged by rain? First of all, in order to prevent the inevitable bad weather environment that may be encountered in flight, the new engine must pass the rain and ice impact test in the process of research and development, design and manufacture, and be modified and improved to prove that the engine structure is intact when inhaling a lot of rain or hail, and the thrust and working condition attenuation will not affect flight safety, and then apply for airworthiness certificate and put it into mass production.

The principle can be simply summarized as follows: in case rain water is sucked into the engine, the fan blades rotating at high speed will be instantly sprayed from the rear of the engine to the outside by the huge centrifugal force generated by the blades through the outer duct, even if a small part of residual water enters the inner duct, it will be blown away again by centrifugation and volatilized with the gradually rising compressed air temperature. At the same time, the pilot will also perform an operation, that is, set the starting position of the engine to the "continuous ignition" position during take-off and landing-this is literally clear, that is, at the beginning of this procedure? After starting, the engine will be in the process of continuous ignition. At this time, even if rain accidentally enters the combustion chamber and causes flameout, continuous ignition can be supplemented immediately in the shortest time to ensure the continuous operation of the engine to the greatest extent.

Influence of airflow on flight

Rainy days can also lead to low-altitude downward flow. When the plane flies to this area, it may lose some lift, and the greater the rainfall, the greater the descending airflow, and the greater the probability and magnitude of altitude drop. This is also the reason why the plane will not take off and land in the case of heavy rain.

Generally, if there is little to moderate rain and there is no obvious thunderstorm, the plane can take off and land in the rain. In case the plane meets downward flow at the final landing, the pilot will stop landing immediately and go all out.