Local Control must verbally specify a runway to be crossed preceded by the word _____.

• A. Cross
• B. Clear
• C. Enter
• D. Proceed

Answer: (A)

The correct term to use is "Cross," which is essential for conveying specific instructions related to runway crossings. When local control needs an aircraft to cross a particular runway, the phrase "Cross [runway number]" provides clear and direct guidance to pilots. This terminology helps ensure that there is no ambiguity in the instructions given, which is critical for maintaining safety in the busy and dynamic environment of an airport.

Using "Cross" explicitly indicates the action the pilot must take, reinforcing that the aircraft should not commence taxiing onto the runway but instead pass over it. This phraseology aligns with standard aviation communications, which prioritize clarity to prevent misunderstandings and potential incidents.

Other options like "Clear," "Enter," or "Proceed" do not serve the specific purpose of indicating the action to cross a runway. "Clear" often indicates that the aircraft is free to take off or land. "Enter" would imply permission to enter a runway, which could lead to confusion about the intended action. "Proceed" is more general and could refer to various movements without the specificity needed for a runway crossing instruction. Therefore, the term "Cross" is the only appropriate choice for this context.