Serious Incident to the ATR72 registered JU-8802 and operated by Hunnu Air on 07/23/2017 en route [Investigation led by AIB / Mongolia]

Preliminary data based on the notification from the Mongolian authorities:

Torque and other parameters of left engine dropped suddenly in flight at altitude 22615 ft and around 70 km from ZMMN airport at 11:40UTC. Crew shut down the engine around 11:47UTC and landed ZMMN airport.