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First ever all engines out event after encounter with volcanic ash that is still relevant today

29 Aug 2022
On 24 June 1982, a Boeing 747-200 had just passed Jakarta at FL370 in night VMC when it unknowingly entered an ash cloud from a recently begun new eruption of nearby Mount Galunggung which the crew were unaware of. All engines failed in quick succession and a MAYDAY was declared. Involuntary descent began and a provisional diversion back to Jakarta, which would necessitate successful engine restarts to clear mountainous terrain en-route was commenced. Once clear of cloud with three successful engines restarts and level at FL120, the diversion plan was confirmed and completed with a visual approach from the overhead. 

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Source Skybrary

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