A spokesperson for South Korea's transport ministry said the checks were in line with a 2018 advisory from the US Federal Aviation Administration. SEOUL: South Korea is preparing to order all airlines in the country that operate Boeing jets to examine fuel switches in the focus of an investigation of a deadly Air India crash that killed 260 people. Fuel switch locks have come under scrutiny after a mention of a 2018 advisory from the United States Federal Aviation Administration (FAA) in a