Final answer:
In a 705 Operation, the additional enroute fuel reserve required for IFR flights is determined by Transport Canada, based on aircraft type, size, and flight length. The reserve is designed to account for unforeseen circumstances and ensure safe completion of the flight.
Step-by-step explanation:
In a 705 Operation, the additional enroute fuel reserve required for IFR flights is determined by Transport Canada. The specific fuel reserve requirements are dependent on the type and size of the aircraft, as well as the length of the flight. The enroute fuel reserve is designed to account for unforeseen circumstances, such as unexpected weather conditions or longer than planned flight durations.
For example, if a flight is operating under Subpart 705 of the Canadian Aviation Regulations and the estimated time enroute is less than 2 hours, the required enroute fuel reserve is 10% of the planned flight time. If the estimated time enroute is between 2 and 3 hours, the required enroute fuel reserve is 15% of the planned flight time.
These requirements help to ensure that aircraft have enough fuel to safely complete their journeys, even if there are delays or deviations from the original flight plan.