The inbound aircraft to a right base should be instructed with which phraseology?

• A. Enter Left Base
• B. Enter Right Base
• C. Turn Right Base
• D. Extend Right Base

Answer: (B)

When directing an inbound aircraft to join the pattern, use wording that clearly places the aircraft into the established traffic pattern on the correct side. For a right-hand pattern, the pilot should be guided to begin the base leg on the right side of the runway. Saying “Enter Right Base” tells the pilot to join the right-hand base leg and then continue to the final, aligning with the pattern’s direction. This phrase is precise and standard for joining a pattern.

Left-base would apply to a left-hand pattern, so it isn’t correct here. “Turn Right Base” doesn’t explicitly indicate joining the pattern and can be ambiguous about timing. “Extend Right Base” would mean to lengthen the base leg rather than entering the base from the final approach, which isn’t appropriate for initiating the join.