unfamiliarity with the flight route. Pilot intoxication was initially suggested but ruled out as a contributing cause. Chart number 21 from the radio facility did not show the terrain the flight crashed into and only indicated the presence of a location to the north at a height of . Investigators concluded that errors in navigation led the pilot to think he was closer to the necessary point of descent than in reality, resulting in a premature descent for a straight-in instrument approach at night, resulting in controlled flight into terrain. Secondary causes of the accident were cited as follows by the ICAO: "1. Failure on the part of the pilot to make use of the navigational facilities available in order to ascertain the correct position, of the aircraft. 2. Infringement of the prescribed minimum safe altitude. 3. Unfamiliarity of the pilot with the terrain on the route." See also Air Inter Flight 148 Crossair Flight 3597 Indian Airlines Flight 605 References Citations Bibliography External Links Alitalia Flight 771 CVR Transcript Airliner accidents and incidents involving controlled flight into terrain Aviation accidents and incidents in India History of Mumbai (1947–present) Accidents and incidents involving the Douglas DC-8 Aviation accidents and incidents in 1962 1962 in India 771 July 1962 events in Asia