On August 18, 2017, at 1400 local time, a Robinson R44 II, VH-LGN, was substantially damaged during a forced landing near Darwin Aerodrome, Australia. The helicopter was operated under the pertinent civil regulations of the government of Australia. The pilot and three passengers were not injured. The pilot reported that during a descending turn at about 50 knots, the helicopter began to vibrate. He attempted to level out and the vibration became worse. He initiated a forced landing The investigation is under the jurisdiction of the Government of Australia. This report is for information purposes only and contains only information released by the Government of Australia. Further information pertaining to this accident may be obtained from: Australian Transport Safety Bureau (ATSB) 62 Northbourne Avenue Canberra ACT 2601 Australia Tel: +612 6274 7439 www.atsb.gov.au