Flaps in a turn
I told a student undergoing a Stage check in a C172 that he should put his flap out to 20 when turning base and to the landing setting when turning final. He said his instructor had told him to never select flap in a turn.
I can see a tiny reason for this but the alternative is that the pilot waits possibly until the approach has become unstable, before putting the flap down.
I mean, a C172?? And a private student?
The only reason for not putting the flap down in a turn is if the POH specifically says that, in my opinion.