Accident Douglas DC-4-1009 HB-ILA,
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Date:Sunday 15 May 1960
Type:Silhouette image of generic DC4 model; specific model in this crash may look slightly different    
Douglas DC-4-1009
Registration: HB-ILA
MSN: 43072
Year of manufacture:1946
Fatalities:Fatalities: 12 / Occupants: 12
Aircraft damage: Destroyed, written off
Location:near Tora-Tonga -   Sudan
Phase: En route
Departure airport:Khartoum-Civil Airport (KRT/HSSS)
Destination airport:Niamey Airport (NIM/DRRN)
The Balair DC-4 flew into a slope of the Djebel Marr mountains while cruising at 8000 feet.
The airplane was operating on a ferry flight from Jeddah, Saudi Arabia to Dakar, Senegal.

PROBABLE CAUSE: "1) The fact that the aircraft progressed actually at an average ground speed of at least 200-205kts while the crew believed they were proceeding with no more than 175-178kts as estimated before takeoff. 2) That a slight directional difference of 2 or 3 degrees may have existed between the calculated track and the actual flight path. 3) That these two navigation inaccuracies could build up during a flight of 2,5h and could eventually result in a position error of about 70nm to the west and about 30nm to the south. 4) That for reasons unknown to the Board the position report given for 1906Z and apparently established on the base of an astronomical fix must have been inaccurate and that the crew were, therefore, not able to be conscious of the discrepancies between the dead-reckoning and their actual position. 5) That the aircraft flying at 8000ft hit a slope of the Djebel Marra mountains four minutes before the crew expected to be overhead the El Fasher beacon where they would have begun the climb to 12000ft and when, in their belief the aircraft should have been still more than 60 NM away from these mountains."




photo (c) ETH-Bibliothek Zürich, Bildarchiv / Swissair; Zürich-Kloten Airport (ZRH); 1957; (CC:by-sa)

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