Accident Overview
A certified flight instructor and a student pilot were conducting a training flight in a helicopter. They flew to a practice area to work on hovering techniques. Prior to turning over the controls to the student, the instructor discussed the procedure for a positive transfer of controls and emphasized the importance of avoiding a tight grip on the controls.
Sequence of Events
The student assumed control of the helicopter and practiced hovering for approximately 10 minutes. During this time, the flight instructor sensed that the helicopter began to settle. Before the instructor could react, the student pilot quickly pulled the collective control full up. This action overrode the throttle, causing the main rotor to lose revolutions per minute (rpm).
Instructor Response and Accident
The instructor immediately attempted to lower the collective and increase engine rpm. However, the left skid of the helicopter contacted the ground, and the helicopter rolled over onto its left side.
Damage
Subsequent inspection revealed damage to the main rotor blades and the firewall.
Probable Cause
Not specified in the source.