What are Duty Limitations based on?

Duty limitations are primarily focused on ensuring the safety and well-being of flight crew by establishing restrictions on the maximum hours pilots can operate. These limitations are designed to minimize fatigue, which can adversely affect a pilot's performance and decision-making abilities. By regulating the amount of time pilots can work, the guidelines aim to maintain high safety standards in aviation operations.

The other options do not directly address the primary purpose of duty limitations. While regulatory guidelines for space management, operational guidelines during adverse weather conditions, and fuel management requirements are all important aspects of flight operations, they do not center on crew fatigue and the operational safety that comes from managing pilot duty hours effectively.