On 10 March 2019, a Boeing 738 MAX 8 left stick shaker activated immediately after takeoff from Addis Ababa for no apparent reason and remained on. A succession of four pitch down manoeuvres not initiated by the crew subsequently occurred and recovery from the final one was not achieved. Terrain impact followed a high speed dive six minutes after takeoff. The Investigation attributed the loss of control to an erroneous single source angle of attack input to the Manoeuvring Characteristics Augmentation System (MCAS) from which, in the absence of an applicable non-normal procedure or appropriate training, recovery was not achievable.