What is the main function of standard IFR fuel requirements?

The primary function of standard IFR (Instrument Flight Rules) fuel requirements is to ensure safety during the flight. These regulations are designed to ensure that an aircraft carries sufficient fuel to safely complete its journey, including contingencies such as delays or diversions due to weather or other operational considerations. By mandating specific fuel requirements, the rules help pilots and operators plan for unexpected scenarios, thereby reducing the risk of running out of fuel mid-flight.

While flight speed, fuel costs, and efficiency are important factors in aviation, they are secondary to the fundamental goal of maintaining safety throughout the flight. Ensuring that an aircraft is adequately fueled to reach its destination, with reserves for emergencies, is essential for safe aviation operations. This priority on safety is reflected in the stringent regulations governing fuel reserves, which are designed to protect both passengers and crew.