Incident Overview
A multi-engine aircraft experienced a loss of directional control during takeoff from an ice-covered runway. The first officer, who was on initial operating experience, had control of the aircraft when the throttles were advanced for takeoff. The aircraft rolled straight ahead for approximately two seconds before beginning to slide to the left.
Actions Taken
The captain then took control of the aircraft but was unable to maintain directional control or stop the aircraft. The aircraft departed the left side of the runway and came to a stop in the mud and snow. An emergency evacuation was conducted following the incident.
Investigation Findings
Investigation revealed that upon application of power for takeoff, the right engine had a 10% greater N1 (fan speed) than the left engine. The first officer was on his initial operating experience in the aircraft.