In short, pilots are not worried about turbulence - avoiding it is for convenience and comfort rather than safety. In the best circumstances, pilots can forecast where turbulence is and steer clear of it.
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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.
From a practical point, no, a modern airliner will not lose a wing due to turbulence. Modern airlines are very tough and designed to withstand extreme turbulence. In theory, it might be possible. But to my knowledge, it has not happened to any jet airliner.
While turbulence can feel scary, airplanes are designed to withstand massive amounts of it. A plane cannot be flipped upside-down, thrown into a tailspin, or otherwise flung from the sky by even the mightiest gust or air pocket, wrote pilot Patrick Smith on his site, AskThePilot.com.
At flight cruising levels, only about 3% of the atmosphere has light turbulence, about 1% has moderate turbulence and a few tenths of a percent has severe turbulence at any given time, says Paul Williams, a professor of atmospheric science at the University of Reading who researches turbulence.
When pilots encounter turbulence, the speed is reduced to turbulence penetration speed Vra. This speed varies from aircraft to aircraft and is provided in the aircraft documentation. The speed for Vra changes with altitude until it changes to a constant Mach number.
As the wings of the aircraft pass through pockets of air of differing density or pressure, the amount of lift generated by the wings changes. For a short time, the lift of the wings is less than the weight of the plane and it drops slightly. This is usually not dangerous to the Aircraft.
Most commercial aircraft now pack weather radar – from the Airbus A321 to the Boeing 777. Weather radar can pick up weather systems sufficiently ahead to warn of precipitation and turbulence, allowing the fast-moving aircraft to divert in time to equally protect the humans and the aircraft.
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.
Even with turbulence, air travel is still the safest option
First, turbulence has not caused an airplane to crash for over 50 years. So, the chances of you being on the first plane to do so in almost half a century are slim to none.
Summer and winter are the worst seasons for turbulence. Winter has strong winds and blizzards, and summer's hot heat can create unstable air, thunderstorms, and tropical storms. That means flying during the holidays often means more turbulence than other times of the year.
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.
Kiernan notes that when pilots do encounter a stretch of unavoidable severe turbulence, they will typically slow down to avoid overstressing the airplane. Pilots will also often opt for a different flying altitude to avoid turbulence.
Most pilots avoid turbulence because it can make flying uncomfortable and can potentially cause damage to the aircraft. Because most of the time it is not predicted and you have no visual clues before hitting it. We CERTAINLY avoid it when we can. What do pilots use to detect turbulence?
With this in mind, horizontal winds (also known as “crosswinds”) in excess of 30-35 kts (about 34-40 mph) are generally prohibitive of take-off and landing. As far as how this happens, it depends on where you are in flight.