On January 1, 1985, while descending towards La Paz, Bolivia, for a scheduled stopover, the Boeing 727 jetliner struck Mount Illimani at an altitude of 19,600 feet (6,000 m), killing all 29 people on board.

Eastern Air Lines Flight 980 had departed President Stroessner International Airport in Asunción, Paraguay, at 17:57 on January 1, 1985, with a passenger contingent of nineteen and a crew of ten.

Feith conducted the on-site investigation with the goal of finding the flight data recorder (FDR) and the cockpit voice recorder (CVR), as well as retrieving other critical information; however, because the wreckage was spread over a vast area and covered by 20 to 30 ft (6 to 9 m) of snow, his fellow team members and he were unable to locate either of the "black boxes".

He did retrieve various small parts of the aircraft cockpit, official flight-related paperwork, and some items from the passenger cabin.

[4] On 4 June 2016, after one of the warmest years on record in the area, human remains and a piece of wreckage labelled "CKPT VO RCDR" were recovered by a team of five in the Andes mountains including Dan Futrell and Isaac Stoner of Operation Thonapa who recovered six large orange metal segments and several damaged pieces of magnetic tape.