World’s Largest Turboprop Aircraft Breaks Apart Midair During Test Flight Killing All On Board An Antonov An-22 military cargo aircraft, the world’s largest turboprop ever built, crashed during a test flight on Tuesday after the more than half-a-century-old aircraft reportedly broke apart midair, killing all seven crew members on board, according to authorities. The aircraft was conducting a post-maintenance test flight when the incident occurred in the Ivanovo region, northeast of Moscow. Offic