South Korea's acting President Choi Sang-mok said on Thursday immediate action must be taken if a special inspection of all Boeing 737-800 aircraft operated in the country finds any issues as authorities ramp up a probe into Sunday's deadly air crash.

Acting President Choi Sang-mok faced his first test as the country's interim leader on Sunday after a deadly plane crash in Muan, South Jeolla, threw gaps in the government and its emergency response system into sharp relief.

South Korean investigators again asked the country’s acting president today to order the presidential security service to comply with an arrest warrant

Finance Minister Choi Sang-mok became on Friday South Korea's second acting president in two weeks, as lawmakers voted to impeach the current acting leader, Prime Minister Han Duck-soo, fuelling political uncertainty in Asia's fourth-largest economy.

The search warrant lists charges of professional negligence resulting in death after 179 people were killed on a Jeju Air flight.

GE Aerospace, whose joint venture made the engines of the Boeing airplane that crashed in the deadliest aviation disaster on South Korean soil, joined the investigation as Seoul extended by a week special inspections of all 101 Boeing 737-800 jets.

South Korea was set Friday to move the tail section of the Jeju Air plane that crashed last week, killing 179 people in the worst aviation disaster on its soil,

South Korea's transport ministry has extended special inspections of all 101 of the Boeing 737-800 jets run by the country's airlines by a week, after the worst aviation disaster on the country's soil,