fairchild c-123k provider (54-0602)

On 16 April 1968, 08:00 CST, C-123K, sn 54-0602 (Call sign MOOSE 09) departed Hurlburt Field, FL, as lead aircraft in a flight of three C-123's. The assigned mission was a routine SEA serial spray training flight. The formation proceeded to a point 25 nm northwest of Panama City, Florida (the designated spray training area), arriving there at 08:35 CST.

At this time a series of simulated defoliation runs were conducted over an open field. At approximately 08:50 CST Aircraft 54-0602 assumed the number three position in a right echelon formation for practice defoliation runs along a series of roads. At the completion of the first run the lead aircraft gave a command to place the aircraft in a "piggy back" formation, then climbed from 150 feet AGL to approximately 300 feet AGL and executed a 270 degree turn to the right. While in this turn the Number Three aircraft contacted the ground in a left wing low position, cartwheeled, immediately caught fire and was destroyed. The instructor pilot, two student pilots, and the flight engineer sustained fatal injuries.

Source : https://aviation-safety.net/asndb/331867