I am an AH-64 D Apache Longbow pilot. I currently hold an FAA license as a Commercial Pilot Helicopter-Rotary Wing, and Airplane Multi-Engine Land as well as an instrument ticket. I have private pilot privileges in Airplane Single engine land. My question is what will it take to add on the commercial single engine rating. I've looked at the PTS and all it gives is what academic and practical areas I will be evaluated on during the check ride. What I want to know is what are the aeronautical experience requirements that I have to meet?