Under the given conditions, what is the maximum available flight time with +13 °C at 2,500 RPM?

To determine the maximum available flight time under the specific conditions of +13 °C at 2,500 RPM, it’s essential to consider the aircraft's fuel consumption at that RPM and temperature. The maximum flight time is primarily governed by the rate at which fuel is consumed compared to the total fuel capacity available.

At +13 °C, the engine is likely to operate efficiently, affecting the fuel consumption rate positively. The 2,500 RPM setting suggests that the engine is running at a moderate power level, which is typically associated with a cruise setting, leading to lower fuel consumption and therefore an extended flight duration.

The correct option indicates that the maximum flight time is 5 hours and 12 minutes, which reflects an optimal balance between fuel efficiency at the specified RPM and environmental conditions. This time likely accounts for the standard fuel burn rates for the engine operating at that specific power setting and temperature, positioning it as a viable maximum duration before fuel limits are reached.

In contrast, the other choices suggest either a significantly shorter or longer flight duration, which may not accurately reflect the fuel efficiency and performance characteristics of the aircraft under these operational parameters. Thus, selecting the option for 5 hours and 12 minutes accurately encapsulates the conditions and available data for fuel