JUDGE Cecil Margo, who presided over two high profile plane crash inquiries, died on Sunday at his Johannesburg home after a long illness. Margo was 85 years old. Margo headed the investigation into the plane crash in October 1986 in which Mozambican president Samora Machel was killed. He also headed the inquiry into the South African Airways Helderberg crash off the coast of Mauritius in 1987, killing 159 people. He was widely recognised as a world expert in the field of aviation and air accident investigation, and was in 1977 appointed chairman of the eight-member Commission on Civil Aviation in South Africa.