20171021020159I

We had just completed 5 commercial maneuvers of various types to a landing on runway 27. These were mostly 360 -degree spirals and 180-degree engine out. Upon takeoff from the 5th landing, I opted not to retract the gear as we were entering the pattern for another 180-degree engine out and did not want the wear and tear on the gear components. We took off as normal and entered the pattern. The gear was still down from the last landing and indicating appropriately (green electrical and mechanical dwn. I started a left base turn for 27 at khzy. The power for the maneuver was brought back to idle as instructed. There was no gear extension warning horn alert as the gear had been down and locked. The approach was as usual, I remember landing nicely on the mains, just about at the numbers. I felt the nose wheel touch down. It felt like a normal landing, we rolled for a couple seconds and I was going to set up for another take off, when all of a sudden, the nose gear collapsed and we were looking down at the runway. I immediately shut of the fuel flow as we were sliding. The aircrafts propeller also made contact with the surface. No sign of fire thankfully. We slid off to the right side of the runway, we secured the airplane. We then exited the airplane. The aircraft came to rest at the end of the 1000 ft marker. We then notified all the authorities.