The Caravelle was operating on a flight from Salvador to Recife and was cruising at 8700 m in VMC. The flight contacted Recife Control over Maceio and received clearance to descend to 6150 m. Recife Approached later cleared the aircraft for 900 m and informed the crew about another aircraft descending from 900 to 600 m on the same direction in IMC. When descending through 1800 m the crew were surprised by the lights of another aircraft. To avoid possible collision the Caravelle was brusquely manouevred upwards. Landing at Recife-Guarapes at 22:09 was normal. After returning to Rio de Janeiro-Galeao, the aircraft was thoroughly inspected by Panair maintenance. It appeared the plane had suffered serious damage to the structure, rendering the aircraft damaged beyond repair. PROBABLE CAUSE: “Rapid evasive manoeuvre judged necessary to avoid collision overloaded the aircraft’s structure.”