PA-44 Seminole/Turbo Seminole
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 94; Flight Crew Total 512; Flight Crew Type 74
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Ground Strike - Aircraft
Air Traffic Control Provided Assistance; Aircraft Aircraft Damaged; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Rejected Takeoff; General Evacuated; General Maintenance Action
Aircraft
We were cleared for takeoff and started our taxi onto Runway XX. Once lined up; we held our brakes did our 2000 RPM engine run to check engine instruments one last time before starting the takeoff roll. All engine instruments were in the normal operating ranges. I am the flight instructor and as the student released the brakes and went full power; I started to lower the mixture to simulate an abnormality on takeoff. While the mixture was being changed; I noticed a rattling; so immediately went back to full mixture and stopped the training simulation. I reached for the throttles and that is when the right gear gave in and we dropped on the right side of the aircraft. Throttles were full idle and mixtures were then cut off. We notified ZZZ Tower of our situation and afterwards completed a full shutdown of the aircraft while waiting for personnel to arrive.
PA-44 Flight Instructor reported the right main landing gear collapsed on takeoff roll.