How many knots defines heavy weather tie down conditions?

Heavy weather tie down conditions are defined as having sustained wind speeds ranging from 46 to 60 knots. This range indicates severe weather conditions that can significantly impact the safety and stability of aircraft on the ground. When winds reach these speeds, it is crucial for crews to utilize heavy weather tie down techniques to secure the aircraft properly, reducing the risk of damage caused by wind forces.

The other choices represent different wind speed classifications where less severe measures may be taken. Wind speeds of 30 to 45 knots indicate strong winds, which also require attention, but they do not reach the threshold for heavy weather conditions. Speeds of 61 to 75 knots correspond to extreme weather, warranting even more robust precautions, while 14 to 20 knots are considered moderate winds, which typically do not necessitate heavy weather tie down procedures. Understanding these definitions is essential for ensuring the proper handling of aircraft during adverse weather situations.