Jet aircraft use swept back wings for high speeds at high altitude. They are not very effective at low airspeeds (takeoff and landing) and high angles of attack (takeoff or go-around.). If a rudder goes full scale to one side at a slow airspeed, it could very well render the ailerons ineffective. I know someone that crashed in training by pressing the wrong rudder on a simulated engine failure on takeoff and that happened. I actually wanted to try it myself in the simulator and I crashed too… the aircraft slowly banks and descends and it is uncontrollable unless you release the rudder. Note : not sure how they are defining “full speed into the ground.” Forward speed or vertical speed… or both?

Edit : just read the article…rudder locked neutral after landing so they couldn't steer on the ground. If it locked neutral in the air, not a big deal, but landing in a crosswind would be difficult if not impossible.

Jet aircraft use swept back wings for high speeds at high altitude. They are not very effective at low airspeeds (takeoff and landing) and high angles of attack (takeoff or go-around.). If a rudder goes full scale to one side at a slow airspeed, it could very well render the ailerons ineffective. I know someone that crashed in training by pressing the wrong rudder on a simulated engine failure on takeoff and that happened. I actually wanted to try it myself in the simulator and I crashed too… the aircraft slowly banks and descends and it is uncontrollable unless you release the rudder. Note : not sure how they are defining “full speed into the ground.” Forward speed or vertical speed… or both?