When is a "Knock it off" call used?

The call for a "Knock it off" is used specifically when the safety of flight is in question or when there is uncertainty regarding the situation. This directive prioritizes the safety of all participants involved in the training or flight operation. It serves as an immediate and important communication tool to halt any ongoing maneuvers or activities that could potentially lead to unsafe conditions or incidents. Ensuring that all pilots and crew members recognize this call allows for quick and effective action in situations where safety is compromised.

While it is possible to end a practice session or to conclude maneuvers at certain times, those scenarios do not carry the same urgency associated with ensuring safety. The "Knock it off" call is specifically tied to situations demanding immediate attention to safety concerns, making it vital for maintaining situational awareness and operational integrity in flight training.