THESE are the dramatic images of a passenger jet being deliberately smashed into the ground as experts try to recreate what happens to an aircraft – and all those on board – in an air disaster.In one of the most extraordinary aviation experiments ever conducted, the 170-seat Boeing 727 comes down in a controlled crash in a remote part of Mexico’s Sonoran Desert.After pilot James Slocum, 55, parachuted out of the plane at 2,500ft, the jet was guided into the ground by a pilot in a following Cessna via a remote-control device. On board the jet were three sophisticated crash-test dummies designed to move like humans.They were arranged in three positions: one in the classic brace and wearing a seat-belt; one belted but not in the brace position; and one neither belted nor in the brace.                –MO