One led from the realization that no one in the nascent industry really understood the effects of real-world weather on the operations of jet engines, especially in icing conditions.
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On 11 November 1998, a Kendell Airlines Saab 340 turboprop aircraft (registered VH-LPI) went into a dangerous stall situation with the two pilots losing control for around 10 seconds due to icing conditions that were experienced near Lake Eildon en route a scheduled flight from Albury to Melbourne.
The statement of the Chief of the General Staff, Gen. Doğan Güreş, that the accident on that snowy day was caused by atmospheric icing was denied by the crash investigators.
The aircraft had been operating Flight 111 from Vienna to Munich with 28 passengers and four crew on board, when its engines failed during landing descent due to icing.
On 5 February 1973, a de Havilland Canada DHC-6 Twin Otter (registered OH-KOA) crashed near Pudasjärvi in heavy icing conditions during a scheduled domestic passenger flight from Oulu to Kuusamo because of an engine failure.
The aircraft with two pilots and ten passengers on board had been on a chartered flight from La Paz to Sucre, when it encountered atmospheric icing conditions, thus being unable to maintain height.