Btw今次相信同coverage無關 有可能死electrical令transponder唔work
It appears that ADS-B data was either no longer sent by the aircraft or the aircraft was outside our coverage area after 23:58:50 UTC.
Based on coverage of previous flights and of other aircraft on the ground at Muan before and after the accident flight, we believe the former explanation is more likely. There are multiple possible possible explanations for why an aircraft would stop sending ADS-B messages, including loss of electrical power to the transponder, a wider electrical failure, or pilot action on the flight deck.
https://www.flightradar24.com/blog/jeju-air-2216-muan/
https://lih.kg/DrdHRJX