Skyhawk 172/Cutlass 172
Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 100; Flight Crew Total 542; Flight Crew Type 435
Human-Machine Interface; Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Excursion Runway; Inflight Event / Encounter Loss Of Aircraft Control
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action; General Maintenance Action
Aircraft; Human Factors; Procedure
I was teaching my student how to land; he had previously done 20 unassisted landings. My student was on the controls on very short final. We were over the runway at about 15 feet AGL when the engine went quiet. The right wing dropped and we lost all lift without hearing the stall horn. Our nose is now pointed at a 40 degree angle to the right from the runway heading. I immediately took controls; leveled the wings and flared so we would bounce on our main gears. We bounced off the runway and headed into the grass; I treated it like a soft field landing. I made sure to avoid any runway lights. ATC asked if there was any damage and if I needed assistance; I said negative. ATC said I can taxi back on the runway and exit runway. I was thankful for ATCs calm demeanor.Power had now returned to the throttle/engine. I was able to taxi back onto the runway; then back to parking.The aircraft I was flying had previously been reported to having faulty mags during a run up; but maintenance was not able find anything wrong. The aircraft is now being thoroughly inspected.
Instructor Pilot reported loss of engine power resulted in a runway excursion after Student Pilot incorrectly applied control inputs; causing Instructor Pilot to assume control.