What happened
During a scheduled flight from Asunción to Buenos Aires, an aircraft identified as LV-ADS experienced a significant mechanical failure involving its third engine while cruising at altitude. Following this malfunction, the plane suffered a structural failure and broke apart in mid-air. The wreckage descended into an open field situated approximately 12 km northeast of Salto. The impact resulted in the total destruction of the airframe and caused 31 fatalities, with no survivors reported among the occupants. Debris from the accident was distributed across an area spanning more than five kilometers.
Findings
Investigations determined that the primary catalyst for the disaster was the overspeeding of the number three propeller, which was triggered by the improper functioning of the propeller governor. This mechanical failure led to the detachment of the propeller, which then collided with the fourth engine, causing the aircraft to disintegrate. A secondary contributing factor involved a lack of rigorous adherence to engine maintenance protocols. Although specific Pratt and Whitney Service Bulletins from 1957 and 1958 were not mandatory, investigators noted that the operator should have addressed the unique service history of the third engine to prevent such an occurrence.