DA42 Twin Star
Flight Crew Commercial; Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 45; Flight Crew Total 380; Flight Crew Type 33
Confusion; Training / Qualification
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Human Factors
My student and I were practicing engine failures prior to take off. I briefed him on the procedure for an engine out on the runway; and told him I would be failing one of his engines. I failed the left engine during takeoff at about 15 knots. Rather than pull power to idle; the student attempted to maintain centerline solely with use of the rudder. We left the runway surface left of the runway; and came to a stop in the grass. We taxied to the ramp; checked the gear for any damage; and returned to our home airport.In the future; I will brief the students on the procedure; and then show them the procedure myself before allowing the student to try. I will also position my hand in such a way to be able to remove the students hand from the throttles in the event of a failure to follow proper procedures.
During initiation of simulated single engine failure (multi-engine aircraft) on deck; student failed to take proper corrective action resulting in aircraft conducting a 90 degree heading change on wet runway and into the grass adjacent to runway ending in aircraft 180 degrees from initial heading. No damage to aircraft or airfield facilities.
DA-42 flight crew reported a runway excursion during a simulated engine failure on takeoff.