The Civil Aviation Authority (CAA) said the helicopter is believed to have struck wires while flying near Mahia East Coast Rd, Mahia.
"As a result, it contacted the ground heavily," a CAA spokeswoman said.
The injured pilot was flown to Gisborne Hospital by the Hastings Rescue Helicopter with moderate injuries, but was later transferred to Waikato Hospital.
Local residents confirmed the crash happened on private property, south of Pongaroa Rd.