What happened
A flight instructor was conducting training maneuvers with a student pilot in a Robinson R-22 helicopter. The pair were practicing hovering and "hovering auto" techniques in preparation for an upcoming check ride. They air-taxied to the runway and announced their departure intentions on the common traffic advisory frequency.
After making a quick stop, the helicopter crew announced they were "on the go." Simultaneously, the pilot of a T-6G airplane also announced that she was departing. As the helicopter moved over the grass area slightly to the left of the runway, its main rotor blades struck the left wingtip of the T-6G.
The impact caused the helicopter to spin and strike the ground. The T-6G pilot remained in the traffic pattern and subsequently landed safely on the takeoff runway. Video footage of the incident showed the helicopter positioned to the extreme left of the airplane's nose, forward of the left wing, just as the helicopter pilot reported being "on the go again." At that moment, the helicopter appeared to be in a nose-low attitude flying just above the taxiway to the left of the aircraft, while the T-6G was in a level flight attitude slightly left of the runway centerline.
Findings
The investigation concluded that the accident resulted from both pilots failing to see and avoid the other aircraft. No specific mechanical failures were cited as contributing factors in the provided narrative.