What is the minimum duration for which the fuel system allows inverted flight?

The minimum duration for which the fuel system allows inverted flight is 60 seconds. This specification is critical for aircraft designed for aerobatic maneuvers, as it ensures that pilots can perform inverted flight without risking engine failure due to fuel starvation. During inverted flight, the fuel behaves differently when compared to upright flight, and the fuel system must be designed to maintain proper fuel flow to the engine. A duration of 60 seconds provides adequate time for pilots to execute maneuvers while accounting for variations in flight patterns and helping to maintain engine performance. This standard enhances both safety and performance for pilots engaged in aerobatic activities.