The Flight Instructor Did Not Remember That The Landing Gear Was Still Retracted
Analysis: The flight instructor stated that during a simulated one engine inoperative approach and landing, the pilot receiving instruction chose to leave the landing gear retracted until the landing was assured. The pilot receiving instruction turned the airplane onto a short base leg before final, increased the mixture and propeller control settings, and increased the airplane bank angle so as not to overshoot the final approach course. The flight instructor saw that the airplane airspeed was decreasing and told the pilot receiving instruction that they were low.