fell off. The aircraft was destroyed but all 8 persons on board survived, although six dogs in the cargo hold did not survive. The number one blade (which had been bent) on the number four propeller failed due to fatigue; this placed unbalanced loads on the engine, causing the engine to separate. 1960s January 6, 1960 National Airlines Flight 2511 crashed near Bolivia, North Carolina after a suicide bomb exploded on board, killing all 34 passengers and crew. February 25, 1960 United States Navy Douglas R6D-1 (DC-6A) 131582 flying from Buenos Aires-Ezeiza to Rio de Janeiro-Galeão Air Force Base collided in mid-air over Guanabara Bay close to the Sugarloaf Mountain with a Real Transportes Aéreos Douglas DC-3 (registration PP-AXD) operating as Flight 751 from Campos dos Goytacazes to Rio de Janeiro-Santos Dumont. The probable causes of the accident are disputed but include pilot error and faulty equipment. Of the 38 occupants of the American aircraft, three survived. All 26 passengers and crew of the Brazilian aircraft died. September 7, 1960 Aerolíneas Argentinas Flight 205 (a DC-6, LV-ADS) crashed near Salto, Uruguay after the number three propeller separated and struck engine four, causing the aircraft to break up, killing all 31 passengers and crew on board. September 13, 1960 World Airways Flight 830 (a DC-6A/B, N90779) struck Mount Barrigada near Agana NAS, Guam after the pilot deviated from the departure procedure, killing 80 of 94 on board. July 19, 1961 Aerolíneas Argentinas Flight 644 crashed 8 mi west of Pardo, Buenos Aires, Argentina due to severe turbulence (some reports state that the aircraft was struck by lightning), killing all 67 passengers and crew in the worst air disaster in Argentine history and the deadliest for the airline. July 21, 1961 Alaska Airlines Flight 779 (a DC-6A, N6118C) crashed on landing at Shemya, Alaska, after the airport failed to turn the landing lights on, killing all six on board. September 10, 1961 A President Airlines DC-6 (registration N90773, Theodore Roosevelt) crashed shortly after takeoff from Shannon Airport, killing all 83 people on board in Ireland's worst air disaster. September 18, 1961 Secretary General of the United Nations Dag Hammarskjöld and 15 other passengers and crew died when their DC-6B (registration SE-BDY) crashed near Ndola, Northern Rhodesia (now Zambia). The plane was owned by Transair Sweden and operated for the UN. A memorial is now sited at the scene of the crash. The