A twin-engine aircraft collided with the ground near Bethel, AK, on a localizer DME approach to runway 36. The incident occurred approximately 186 degrees radial from the Bethel VOR, resulting in impact with terrain. Weather conditions included wind at 060 degrees (true) at 22 knots, gusts to 28 knots, visibility of 1 statute mile in light snow and mist, clouds and sky condition of 800 feet broken, 3,500 feet overcast, and temperature of 25 degrees F, dew point of 22 degrees F, and alimeter 29.21 inHg. The probable cause was the captain’s descent below the minimum descent altitude, leading to impact with terrain during an instrument landing approach. Contributing factors included failure to reset altimeters, meteorological conditions (snow obscuration), and ambient night light conditions.A twin-engine aircraft collided with the ground near Bethel, AK, on a localizer DME approach to runway 36. The incident occurred approximately 186 degrees radial from the Bethel VOR, resulting in impact with terrain. Weather conditions included wind at 060 degrees (true) at 22 knots, gusts to 28 knots, visibility of 1 statute mile in light snow and mist, clouds and sky condition of 800 feet broken, 3,500 feet overcast, and temperature of 25 degrees F, dew point of 22 degrees F, and alimeter 29.21 inHg. The probable cause was the captain’s descent below the minimum descent altitude, leading to impact with terrain during an instrument landing approach. Contributing factors included failure to reset altimeters, meteorological conditions (snow obscuration), and ambient night light conditions.