520 Die in Crash. In 1985, 520 people died when pilots on Japan Airlines flight 123 lost most control over the plane. It crashed into a mountainside, making it the deadliest crash ever. Why Planes Crash Video - weather.com
flygcforum.com - On Monday, August 12, 1985, the Boeing 747-146SR that made this route, registered JA8119, suffered mechanical failures 12 minutes into the flight and 32 minutes later crashed into two ridges of Mount Takamagahara in Ueno, Gunma Prefecture, 100 kilometers (62 mi) from Tokyo.