Ogden, UT, USA
N1510A
Schweizer 300C
The instructor pilot and the private pilot under instruction arrived at the location where they were going to practice pinnacle approaches and landings. They reconnoitered the area at 300 feet above ground level (agl) in preparation for landing. They performed a power check at 500 feet agl, and concluded that engine power was sufficient to maintain an out of ground effect hover. The student began the approach at 350 feet agl. The helicopter's rate of descent was 500 feet per minute (fpm) at 25 knots of airspeed. Settling with power (vortex ring state) can be encountered when rates of descent are greater than 300 feet per minute and airspeed below that of translational lift. The helicopter began to overshoot the point of intended landing, and the approach became almost vertical. At 30 feet agl, the helicopter's descent rate increased and the student aborted the approach and began a go-around. The instructor realized that rotor revolutions-per-minute (rpm) had degraded below the normal range, so he took the control of the helicopter. Because the go-around had been initiated, the helicopter was moving forward slowly over a descending slope and the instructor was not able to land the helicopter. He attempted to gain power by lowering and raising collective; however, the helicopter's skid contacted the ground and the helicopter rolled over.
In a written statement, the instructor pilot reported that he and the private pilot under instruction performed a normal takeoff and departure. After a short flight they arrived at Rocky Point (9 miles north of Ogden-Hinckly Airport), where they were to practice pinnacle approaches and landings. They reconnoitered the area at 300 feet above ground level (agl) in preparation for landing. They performed a power check at 500 feet agl, and concluded that engine power was sufficient to maintain an out of ground effect (OGE) hover. The student began the approach at 350 feet agl. The approach became slightly steep and went past the point of the intended landing. The pilot under instruction reported that the rate of descent was 500 feet per minute (fpm) at 25 knots. At 30 feet agl, the helicopter's descent rate increased, the pilot under instruction aborted the approach, and began a go-around. The instructor realized that rotor revolutions-per-minute (rpm) had degraded below the normal range, so he took the controls from the student. Because the go-around had been initiated, the helicopter was moving forward slowly over a descending hill slope and the instructor was not able to land the helicopter. He attempted to gain power by lowering and raising collective; however, the helicopter's skid contacted the ground and the helicopter rolled over. FAA-H-8083-21, Rotorcraft Flying Handbook, states that vortex ring state (settling with power) is likely when the rate of descent exceeds 300 fpm, and the horizontal velocity is slower than effective translational lift.
The pilot under instruction's encounter with a settling with power condition, and the flight instructor's failure to maintain adequate rotor rpm during the subsequent go-around. Also causal was the instructor pilot's delayed remedial action during the approach sequence and his inadequate supervision of the flight.
Source: NTSB Aviation Accident Database
Aviation Accidents App
In-Depth Access to Aviation Accident Reports
