20191109022939A

The PIC was having a check ride. The PIC departed bjc to the north practice area where he completed the requisite maneuvers within acs standards and stated he was feeling very comfortable with the speed at which he was moving through the check airman's plan of action and his hand flying skills on that day. On the way back to bjc, he contacted denver approach to set up a simulated single engine approach using the ILS 30R. Once established on the ILS, approach passed him to bjc tower and the check airman requested three touch and gos. Bjc tower said they could fly the approach in as FAR as he would like but asked if he could sidestep to 30L for their touch and gos. The check airman confirmed and they were subsequently cleared for the option. They sidestepped to the left and on short final check airman and PIC both confirmed that the gear was in the down position. The PIC felt like he executed a safe and smooth landing but was just to the left of center line. As he was in the process of correcting back to the center line and starting his post landing flow for the next takeoff, the PIC reached over with his right hand and retracted the landing gear. This action caused them to begin skidding down the right side of the runway where they finally came to a stop at the intersection of 30L and the approach end of 03. The PIC executed an emergency evacuation of the aircraft and confirmed that neither he or the check airman had sustained any injuries. Once it was clear that the aircraft was not on fire, nor did it appear that fire was imminent, the PIC returned to the aircraft and attempted to secure the engines by turning the battery and magnetos off and closing the throttles and mixtures.