Which of the following is NOT a requirement for IFR fuel?

The correct choice identifies an additional hour of fuel beyond the destination as not a requirement for IFR (Instrument Flight Rules) fuel planning. When filing a flight plan under IFR, pilots must ensure they have adequate fuel for several essential flight segments. This includes fuel to reach the intended destination, any necessary fuel for a direct route, and an allowance to reach an alternate airport in case of unforeseen circumstances such as weather changes or airspace restrictions.

In typical IFR regulations and practices, the requirement of having a minimum of 45 minutes of fuel at cruise represents a safety buffer, ensuring that pilots have a margin for unforeseen delays or diversions. However, the requirement for additional fuel to cover one hour beyond the destination, while potentially advisable for safety or specific operational protocols, is not a standardized regulatory requirement under IFR rules.

Thus, the option of having an additional hour of fuel does not strictly fall into the required categories for fuel planning in IFR, making it the correct choice in this context.