What happened
Following a routine flight departing from Yangon, the aircraft was performing its descent toward Tachileik Airport. During the descent process, the captain communicated with Air Traffic Control to report that the plane had recently passed through an altitude of 9,500 feet.
As the flight continued on its final approach, the aircraft collided with the slope of Payakha hill. The impact occurred approximately 3 km before reaching the runway threshold. The collision resulted in the total destruction of the airframe and caused the deaths of all 36 occupants.
Findings
Official investigations concluded that the primary factor in the accident was that the crew descended below the minimum descent altitude (MDA) for reasons that remain undetermined.