What is the maximum speed limit for an aircraft flying below 10,000 feet MSL?

The maximum speed limit for an aircraft flying below 10,000 feet MSL is 250 knots. This speed restriction is in place to ensure safety and reduce the noise impact on people living near airports. The lower altitude zone is typically where most aircraft are taking off or landing, which is why maintaining a lower speed helps manage traffic flow and decreases the likelihood of wake turbulence encounters.

Additionally, while it might seem that higher speeds could be safe, restrictions are designed to account for the complexities and potential hazards of flight operations at lower altitudes, where pilots are more focused on maneuvering and other traffic. These limits help to create a more structured environment—especially in busy terminal areas where there is a greater concentration of aircraft.

The other speed options exceed what is deemed safe within that altitude range due to various operational considerations, including the need for increased reaction time and coordination among instrument procedures and traffic management.