What is a critical design requirement for the fuel jettison valve?

The critical design requirement for the fuel jettison valve is that it must allow closure during any part of the jettisoning process. This capability is essential for maintaining control over the fuel being jettisoned. If the valve cannot close while fuel is being jettisoned, it could lead to an uncontrolled release, potentially resulting in unsafe flight conditions or an inability to manage the aircraft’s weight properly during an emergency situation.

Ensuring that the valve can close at any time provides pilots with the flexibility to manage fuel load as needed, regardless of the phase of the jettisoning operation. This control is vital in preventing excessive fuel discharge and in maintaining the safety and performance of the aircraft.

Other requirements might include considerations for remote control functions or operational reliability, but the ability to close the valve at any point in the jettisoning process is paramount for safety and operational integrity.