There's also a 50% chance that if flap comes out asymmetrically in a turn it will roll you towards wings level! This thread started out about advice given to pilots of light aircraft but has moved on to cover modern airliners which have built in flap asymmetry protection and where no advice about avoiding deploying flaps in a turn has ever existed. Oh the joy in a 747 of working out whether it was a split flap or assymetric flap condition. I remember in simulator details Captain, Copilot and Flight Engineer writing on a piece of paper which one they thought it was. Frequently two would think it split and one assymetric.