Seoul: South Korea’s transport ministry announced that authorities have relocated two engines from the Jeju Air jet involved in a fatal crash to a hangar for thorough investigation.

According to Yonhap News Agency, the Jeju Air aircraft, carrying 181 passengers returning from Bangkok, crashed during its landing at Muan International Airport in the southwestern county of Muan on December 29, resulting in the deaths of all but two individuals on board. The transport ministry reported that one engine was moved to the hangar on Friday, while the other had been relocated the previous day.

Authorities have transcribed the two-hour audio from the cockpit voice recorder, which might offer additional insights into the cause of the crash. The ministry stated that two aviation investigators are scheduled to transport the flight data recorder to the U.S. National Transportation Safety Board on Monday for further analysis.

South Korea also plans to conduct a special inspection of 101 B737-800 planes, the same model as the crashed jet, operated by six South Korean airlines, with the investigation set to continue through Friday.