A320 S speed question
Once I was flying the 320 on a terminal are, and were requested to slow down. So I asked for F1, what led the airplane to fly at S speed, around 182kt. The APP requested the speed to be reduced to 170kt, so, as we were far from the airport, and I did not want the airplane to fly with the flaps out, I manually selected the speed at 170, thus flying below the S speed. I did so because I understood that the minimum speed I could fly in would be VLS, as, the name says, is the Lowest Selectable speed. The captn of the flight told me I was wrong, and should never have done it. That I could not fly below S speed, and, instead, had to ask for F2 and fly above F speed. Does he have a valid point ?