When issuing wake turbulence advisories to any aircraft landing behind the arriving or departing Category B or D aircraft that is on the same runway or parallel runway separated by less than 2,500 feet, an example of the phraseology is ___.

• A. CAUTION WAKE TURBULENCE, HEAVY DC-TEN, THREE MILE FINAL
• B. CAUTION WAKE TURBULENCE, HEAVY DC-TEN, ONE MILE FINAL
• C. CAUTION WAKE TURBULENCE, HEAVY DC-TEN, TWO MILE FINAL
• D. CAUTION WAKE TURBULENCE, HEAVY DC-TEN, FOUR MILE FINAL

Answer: (C)

Wake turbulence advisories are used to alert pilots that a following aircraft could encounter the strong vortices from a heavy aircraft that is nearby on final or close to the runway. When the trailing aircraft is on the same runway or a parallel one with less than 2,500 feet of separation, the guidance is to specify the distance remaining on final to convey how close the hazard is. The phrase “ONE MILE FINAL” communicates that the following aircraft is about one mile from the threshold on final approach, which is the proximity that warrants a caution given the close spacing behind a heavy.

This option best matches the situation described, providing precise, urgent guidance about the wake turbulence risk. Distances like three, two, or four miles final would imply a greater separation and a lower immediate risk, which doesn’t fit the scenario of close, hazardous proximity to the heavy.