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.

Investigators of the South Korean airline crash on December 29 that killed 179 people have said the plane's flight recording devices stopped working minutes before the tragedy. Jeju Air's Boeing 737-800 burst into flames after it belly-landed at Muan International Airport in South Korea,

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