Why did you cut off?” one of the pilots asked, as the cockpit voice recorder picked up the bewilderment that would come to characterize the worst air tragedy in a decade. The initial probe of Air India Flight 171’s fatal crash on June 12,

The U.S. Federal Aviation Administration and Boeing have privately issued notifications that the fuel switch locks on Boeing planes are safe.

India and Singapore ordered their airlines to examine fuel switches on several Boeing models with South Korea set to do the same after the devices came under scrutiny following last month's crash of an Air India jet killed 260 people.