What happened
During the landing phase, the captain reported that after lowering the nosewheel and applying reverse thrust, the engines became quieter than normal. As the aircraft slowed to taxi speed, the nose began turning to the right. Despite the pilot applying steering controls, the airplane continued to turn and began to slide, eventually coming to a stop near the edge of the runway at an angle 70 degrees off the runway heading. Upon stopping, the captain realized that the engines were no longer operating.
At the time of the incident, weather conditions included a 600-foot ceiling and visibility of 3/8 of a mile in snow and fog. Surface winds were recorded at 360 degrees at 16 knots, with gusts up to 27 knots. The tower reported 1/4 inch of snow on the runway with braking action rated as fair to poor. A witness noted that the airplane was engulfed in a cloud of snow during landing and observed the engines sounding as if they had lost intake air before becoming silent. Additionally, a witness reported slush accumulations on the runway exceeding 1/4 inch.
Findings
The engine manufacturer stated that an engine flameout can occur if 1/4 inch or more of slush is ingested into the engines while they are operating at low power, such as during the landing process.