Turbulence, which is caused by disruptions in the airflow around a plane, can be extremely uncomfortable to experience, but it’s mostly not dangerous.
There are many different kinds of turbulence, but they all include disruptions in the air.
Modern planes are designed to withstand even the worst turbulence, so it’s extremely rare for turbulence to crash an airliner.
Is Turbulence Dangerous?
Turbulence isn’t dangerous, but it can be uncomfortable.
Modern airplanes are designed to withstand the worst turbulence, and a plane actually doesn’t even move a lot even during the worst turbulence.
It’s extremely rare for turbulence to be dangerous for a plane, so you shouldn’t worry if you experience turbulence during a flight.
The Severity and Dangers of Turbulence
Turbulence is forecasted on a relative scale of perceived effect on a ‘typical aircraft’.
The turbulence scale has four grades:
Light turbulence includes slight changes in altitude with minor effects on a plane and its passengers.
Moderate turbulence will also have changes in altitude, and the effects felt will be more intense.
The plane may also experience differences in attitude, but the pilot will remain in control of the aircraft.
Severe turbulence involves large, abrupt changes in altitude and/or attitude.
A pilot may momentarily lose control of the aircraft during severe turbulence, and some objects may fly in the cabin. Yet, there will be minor damage to the aircraft overall.
Extreme turbulence can cause structural damage to the aircraft and possibly result in loss of control.
8 Types of Turbulence
There are 8 different causes of turbulence.
Clear Air Turbulence
Clear Air Turbulence(CAT) suddenly occurs in clear, cloudless, weather.
CAT causes an aircraft to violently shake, but it’s usually not dangerous.
CAT mostly happens outside of clouds at altitudes above 15,000 feet MSL, and is caused by strong winds from the jet streams.
Thermal turbulence is caused by warm air rising from the surface or cold air moving over warmer ground.
The rising currents result in compensating slower downward currents, which results in turbulence.
These thermal currents prevent the air from flowing normally.
Temperature Inversion Turbulence
Turbulence inversion happens when a layer of calm air rises above turbulent air.
The turbulent air brings down warm air and cools the upper part of the warm air.
The calm air on the top eventually becomes warmer, resulting in a temperature inversion.
Although temperature inversions produce a stable atmosphere, there is often turbulence between the turbulent layer and the outside atmosphere’s boundary.
Mechanical turbulence is caused by wind flow around irregular terrain or artificial obstructions, like tall buildings.
Horizontally flowing wind is disturbed by these obstructions and transformed into irregular wind movements that cause turbulence.
Frontal turbulence is either caused by rising warm air or abrupt shifts between warm and cold air.
Fast-moving cold winds cause the worst frontal turbulence.
Frontal turbulence can be especially severe if the air is moist and causes thunderstorms.
Mountain Wave Turbulence
Airflow over the mountain results in the air currents oscillating between altitudes. This oscillation causes turbulence that extends for hundreds of miles down the mountain.
Although storm clouds are the only visible part of a thunderstorm, the turbulence caused by thunderstorms extends far outside the storms.
It’s even possible for thunderstorms to generate severe turbulence as far as 15 to 30 miles from a storm cloud.
Wake turbulence forms behind aircraft – it occurs because of atmosphere disturbances.
The most important components of wake turbulence are wingtip vortices and jetwash.
Although wake turbulence can be very dangerous, it normally only lasts for only a short duration, and smaller planes are much more greatly affected.
Why Does Turbulence Occur?
Turbulence is caused by irregular or violent wind, which causes planes to bounce around.
Turbulence is comparable to when two ocean waves meet.
When two large waves collide, they create even larger waves, causing disturbances for ships.
Like ocean water, air is always in motion, and planes depend on the air’s motion to fly. Aircraft depend on airflow above and below the plane’s wings. When irregularities disrupt these airflows, the result is turbulence.
As explained above, there are different types of turbulence caused by different factors like rising temperatures, thunderstorms, and mechanical failures.
How Long Can Turbulence Last?
On average, turbulence lasts between 10 and 15 minutes, but it may last longer depending on the cause of turbulence.
For example, turbulence caused by landing an aircraft lasts for only a few minutes.
Turbulence can often feel like it lasts an eternity because of its intensity, but it will almost never exceed 20 minutes.
How Does Turbulence Affect a Plane?
Turbulence can rapidly change a plane’s altitude and make it feel like the plane is falling.
Most commercial planes fly at an altitude of 30,000 feet or higher, so the decline in altitude is minimal.
Nowadays, turbulence rarely causes plane crashes because modern planes are engineered to withstand immense trauma.
In fact, modern airplanes can withstand 1.5x force on their airframes, as well as most changes in atmospheric conditions.
The most dangerous type of turbulence is wake turbulence, which can cause airplanes to roll mid-air, which can damage the aircraft.
Yet, turbulence is largely not dangerous for planes and won’t cause permanent harm.
Have Any Planes Crashed Due to Turbulence?
The Federal Aviation Administration(FAA) reports 234 turbulence accidents between 1980 and 2008.
These incidents include 298 injuries and three fatalities, of which 2 were caused by passengers not wearing seatbelts.
Most turbulence accidents don’t result in plane crashes or fatalities, but there are notable exceptions.
For example, American Airlines Flight 587 crashed in New York City in 2001 due to wake turbulence from another plane.
Can Pilots Avoid Turbulence?
Pilots can avoid turbulence, and they’re trained to do so, too.
Pilots rely on weather data to predict areas where turbulence is high, and they avoid those routes.
Most types of turbulence are easy to predict because it’s caused by predictable weather.
The most difficult type of turbulence to avoid is clear air turbulence.
Common Myths About Turbulence
- Myth #1
“Turbulence can tear apart planes”
Reality: Modern airplanes can withstand the worst turbulence.
- Myth #2
“It’s safe to unfasten your seatbelt”
Reality: Unfastened passengers in a plane can be thrown around, so you should always fasten your seatbelt.
- Myth #3
“Turbulence causes many plane crashes”
Reality: Pilots are trained how to fly during turbulence, and crashes caused by turbulence are very unlikely.
In conclusion, turbulence is mostly not dangerous. Most turbulence only lasts for a few minutes and doesn’t damage airplanes.