After analyzing the devices, the U.S. National Transportation Safety Board concluded​ that both the flight data and cockpit voice recorders stopped working about four minutes before the crash.

South Korea’s acting president Choi Sang-mok has ordered an emergency safety inspection of the country’s entire airline operation system a day after 179 people were killed in the deadliest crash in the nation’s history.

A former transport ministry accident investigator said the discovery suggests all power, including backup, may have been cut, which is rare.

Ultimately, the plane crashed, killing 179 people in South Korea’s worst aviation disaster. A standard pre-flight inspection found “no issues” with the Jeju Air passenger plane before it crashed.

In his own words, a restaurant owner described recording videos of the Jeju Air plane crash as it happened. “Every time I closed my eyes, I kept seeing afterimages of the blast.”

Investigators from the NTSB and Boeing were expected to join the investigation into South Korea's deadliest air crash.

Authorities investigating the deadly JeJu Air plane crash that claimed 179 lives in South Korea are reporting that the plane’s black boxes stopped recording about four minutes before the aircraft ultimately collided with a concrete structure after landing.

Bird feathers have been found in an engine recovered from the site of the deadly Jeju Air flight which crashed-landedand killed 179 people in South Korea, investigators said. The Boeing 737 -800 skidded off a runway at Muan International Airport and hit a concrete fence, bursting into flames, on 29 December.