Date: 202108
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Operator: FBO; Other Flight school
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Takeoff / Launch
Airspace: Class C ZZZ
ATC / advisory: Tower ZZZ
Reporter organization: FBO
Reporter function: Pilot Not Flying; Instructor
Reporter qualification: Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Commercial
Human factors: Workload; Training / Qualification
Anomaly: Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object; Ground Excursion Runway
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Regained Aircraft Control; Flight Crew Returned To Gate
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: The following is my best recall of the events between approximately XA:00 and XB:30 Zulu on Date which resulted in damage to the aircraft.Student: Private Pilot seeking a Multi Engine add on ratingThe day's lesson was an introduction to engine failure procedures in the aircraft. We had previously covered these procedures in our simulator; most recently on date [two days prior]. Before the flight we reviewed the lesson plan; which was to include:1. I would conduct all communication with ATC during the flight so that he could focus on procedures.2. A simulated engine failure on takeoff to be verbalized by me as 'engine failure' with the student responding by retarding both throttles to idle and declaring an aborted takeoff. He did not respond to my first call; but on the second call of 'engine failure' he followed the procedure correctly.3. Simulated engine failure on climb out by retarding one throttle to idle and with the student following the appropriate response flow; then resetting the throttle for climb to the practice area. This went according to plan.4. Upon reaching maneuvering altitude in the practice area (4;000 feet) a simulated engine failure with fuel selector set to Off and the student following the response flow and troubleshooting checklist. This was followed by securing the engine per the checklist; then restarting per the checklist. This all went according to plan.5. Demonstration and practice of the VMC maneuver with engine failure simulated by throttle setting. This went according to plan.6. Return for landing; with simulated engine failure by throttle setting. This went according to plan.After landing; I requested a taxi back to the ramp as I thought the student was maxed out for the day based on previous flights and how much we had covered. However; as we had about 40 minutes left in our lesson block he asked if we could do some pattern work. Per his request I requested taxi instructions to Runway XXR. Once reaching the hold short line for [Runway] XXR I failed to recognize that the remaining flight was no as longer planned; and failed to develop and verbalize a brief specific to it. I was still operating under the assumption that we were practicing simulated engine failures per the original flight plan. In hindsight I believe that the student was operating under the assumption that we were setting up for pattern work with no planned (simulated) failures. We received clearance to take off and the student entered the runway following all normal procedures. He advanced the throttles for takeoff; and once we were rolling; but before positive airspeed indication; I retarded the right mixture control to idle cutoff (which we had done in the simulator on the previous lesson). The student did not respond to the engine failure; keeping both throttles full for take off. We immediately started veering south toward the right side of the runway. I called for the student to retard the throttles; but he did not respond. I moved the right mixture control full forward to restart the engine in an effort to eliminate the asymmetric thrust and regain directional control; but by then we were crossing the runway edge and about to run into a taxiway location sign (Taxiway 1). At this point the student did retard both throttles to idle. The nose wheel struck the location sign and the left propeller struck either a runway edge light or a taxiway light. We stopped on Taxiway 1; but in the process made a looping turn and ended up facing east on the taxiway. The Tower controller called to ask if we were alright and I responded that we were. I requested and received taxi instructions to our maintenance hangar. After clearing Runway XXL on the east side I provided more detail to the Tower controller and informed them that I would call with additional detail once I was back at the office; which I did. Additionally; Operations and Security personnel came to the office and took a statement from me. At this point the student had already left the school.Contributing factors:1. My failure to properly brief the unplanned scenario with the student and anticipate the potential failure.2. The student's failure to follow established procedure.3. No brakes on the right side limited my options for regaining control.




Synopsis: Instructor pilot reported a student lost control of the aircraft during a simulated engine failure on departure.