This is a Significant Operational milestone.
The aircraft, a tandem rotor, was the successful outcome from a number of earlier helicopter developments led by General Chia-Jen Chu. The flight was an out of ground effect hover.
Source: "First Chinese Tandem Helicopter Designed by Major General Chu Chia-Jen of ROCAF", Jacques Virasak, Paper Presented at the American Helicopter Society 72nd Annual National Forum, May 19 2016
Source: "Republic of China Air Force Helicopters", Jacques Virasak, VFS web page, Last accessed Feb19, 2019