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.

In response, Boeing and the US Federal Aviation Administration (FAA) have reaffirmed that the fuel-switch design is not inherently unsafe, and no immediate airworthiness directive is warranted.