What is the correct method for a PIC to compute necessary fuel reserve?

The correct method for a Pilot in Command (PIC) to compute necessary fuel reserve incorporates a strategy that ensures an adequate margin for safety and unforeseen circumstances. The requirement of calculating fuel reserve as "flight time plus 10% up to 45 minutes or 20 minutes, whichever is greater" reflects a systematic approach aligned with aviation safety standards.

This method accounts for both short and long flights by providing a minimum time of 20 minutes in reserve, regardless of the flight's duration. For longer flights, the 10% calculation up to 45 minutes becomes relevant, ensuring a substantial buffer against unexpected delays or diversions. This balance between percentage-based calculations and fixed time guarantees that the fuel reserve remains practical and appropriate for the varying lengths of flights.

In contrast, other methods suggested, such as flight time plus 15% or a fixed additional hour, may not meet the regulatory standards or effectively accommodate the requirements of both short and long flights, creating potential risks for fuel management and overall flight safety. Therefore, the chosen approach aligns best with regulations set forth for fuel reserve calculations.