When the local controller authorizes the crossing of the active runway, the runway must be specified preceded by the word "________".

The correct answer is "CROSS" because in air traffic control communications, clarity and standardized phrases are crucial for safety and efficiency. When a local controller authorizes an aircraft to cross an active runway, the instruction must include the specific runway identifier followed by the term "CROSS." This phrase clearly indicates to the pilot the specific action permitted and the location on the airfield where it is safe to proceed.

Using the word "CROSS" establishes an unambiguous command that emphasizes the requirement for the aircraft to go from one side of the runway to another while it is active. This is essential since active runways can be in use for takeoffs and landings; thus, precise communication is necessary to prevent misunderstandings that could lead to dangerous situations.

In this context, other phrases such as "STOP," "LIMIT," or "PROCEED" do not convey the specific authorization to cross the runway and may cause confusion. For example, "STOP" could imply a halt rather than a crossing, while "PROCEED" does not explicitly instruct the aircraft to cross the runway. "LIMIT" lacks the necessary clarity for the action being taken. Therefore, the use of "CROSS" is both a regulatory requirement and a best practice for