Avoid flying close to lenticular clouds because they are important indicators of localized strong wind and heavy turbulence along mountain ranges. Mammatus clouds are also highly dangerous as they can harbor severe storms and damaging precipitation.
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Moreover, the turbulence inside a cloud can become extreme and break apart an aircraft. Thus, it is extremely dangerous to fly inside such a system.
This air should contain more mass per unit volume (that is, higher density fluid).This changes the amount of lift experienced as the plane passes through it. This would produce sudden changes in the amount of lift, causing shaking when entering or exiting the clouds.
Severe turbulence can cause a plane to drop so suddenly that pilots temporarily lose control. But, again, that's not enough to crash the plane. That's not to say it's never happened. In 1966, human error and turbulence combined to bring a plane down over Mount Fuji.
Mammatus cloudsAirline pilots will normally take action to avoid any cumulonimbus clouds, but particularly those bearing mammatus formations, as these indicate especially severe turbulence within the cumulonimbus.
When an aircraft experiences turbulence, the plane can drop or change altitude suddenly. This is why pilots always caution passengers to buckle up and stay seated when they are experiencing flight turbulence. The sudden movements put passengers at risk.
While pilots can't actually see turbulence, they often know what is coming up, thanks to reports from other planes, weather reports, and radar equipment. However, clear air turbulence (severe turbulence occurring in cloudless areas) can sometimes catch pilots off guard.
During the 1970s, 80s and 90s there were several accidents caused by thunderstorms in the U.S. and around the world. Since the mid-90s, due to advances in technology and training, the U.S. has not experienced a thunderstorm-caused accident.
“The first step in avoiding an encounter with clouds at night is a good weather briefing. This weather briefing will give you an idea of where the cloud layers are expected. However, don't expect these forecasts to be precise because they are simply that: forecasts.
Planes have headlights so that pilots can see what is in front of them. Unfortunately, they are only effective during takeoffs and landings. Even with the slight illumination offered by the headlights, only darkness is visible when looking out the front window of a cockpit.
It's almost unheard of for turbulence to cause a crash, but it can lead to costly repairs for carriers. Usually, the damage is to cabin components like seats and overhead bins when luggage falls out or people hit them. Turbulence-related damage, delays and injuries cost airlines up to $500 million per year.
The stronger the wind speed (generally, a surface wind of 20 knots or higher is required for significant turbulence), the rougher the terrain and the more unstable the air, the greater will be the turbulence. Of these factors that affect the formation of turbulence, stability is the most important.