Boeing 777X Pushes Its Limits

Aerospace giant’s crosswind testing in Lubbock, Texas, literally goes sideways.

Thursday, May 01, 2025 at 06:30 AM ET

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A Boeing 777X at the Dubai Airshow [Credit: AirlineGeeks/William Derrickson]

Key Takeaways:

Aviation's "crosswind component" defines the wind speed at which an aircraft risks losing rudder authority, a critical safety metric.
Aircraft manufacturers like Boeing conduct extensive crosswind testing for their planes (e.g., 777X in 40-60 knot winds), combining simulator work with real-world flights.
This rigorous testing process, involving meteorologists and test pilots, aims to establish maximum demonstrated crosswind capabilities and precise operating procedures for airlines and pilots.
Pilots are trained to manage crosswinds through specific techniques and to execute a go-around if rudder authority is compromised, underscoring the importance of knowing an aircraft's performance parameters.

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There are a lot of performance metrics in aviation, and one of them is crosswind component. In short, it’s the speed of the wind that, when exceeded, means to run out of rudder authority.

In training airplanes such as the Cessna 172, you will find a notation of the “demonstrated crosswind” with the caveat “not a limitation.” To get this information the aircraft manufacturers put their airplanes into crosswind conditions to see that it can handle them.

Meg Godlewski has been an aviation journalist for more than 24 years and a CFI for more than 20 years. If she is not flying or teaching aviation, she is writing about it. Meg is a founding member of the Pilot Proficiency Center at EAA AirVenture and excels at the application of simulation technology to flatten the learning curve. Follow Meg on Twitter @2Lewski.