Cessna 172 flap limitation
Quote from my 1962 Cessna 172C Owner's Manual, page 3-6, Landing:
"Normal landings are made power off with any flap setting. Slips are prohibited (my emphasis) in full flap approaches because of a downward pitch encountered under certain combinations of airspeed and side-slip angle"
It's a wonderful document - the same section on landing says "landings are usually made on the main wheels............."