What is the term for a pre-briefed fuel state required to terminate an event and transition to the next phase of flight?

The term "Joker Fuel" refers to a pre-briefed fuel state that signifies the minimum amount of fuel remaining before a pilot must terminate a current mission event and transition to the next phase of flight. This concept is crucial for mission planning and execution as it helps ensure that the aircraft has enough fuel to safely complete its objectives and return to base or proceed to the next destination.

By establishing a Joker Fuel state, pilots can effectively manage their fuel consumption during operations, enhancing safety and operational efficiency. It serves as a critical point of communication among crew members and can indicate when it's time to disengage from the current task to avoid potential fuel exhaustion.

This concept is distinct from other fuel terms like "Bingo Fuel," which specifically indicates the amount of fuel required to return home safely; "Reserve Fuel," which is an additional safety margin; and "Emergency Fuel," which signals a critical situation requiring immediate action. Each term plays a unique role in flight management, but Joker Fuel serves specifically to guide operational transitions based on pre-determined fuel thresholds.