When may plain language markings be used?

Plain language markings may be used when necessary for clarification. This practice is intended to enhance understanding and ensure that communication is clear and effective, particularly in situations where standard terminology might lead to confusion or misinterpretation. By employing plain language, controllers can provide direct and easily understood instructions that can facilitate safer operations and better compliance with directives.

In this context, the use of plain language is not limited to specific scenarios such as emergencies or directives from supervisors, and it is not required at all times—only when it is necessary to clarify communication. This flexibility allows controllers to adapt their communication style to the needs of the situation and the individuals involved, fostering a safer and more efficient air traffic management environment.