No fatalities

Engine Power Loss During Takeoff Leads to Runway Excursion and Injuries (N959L)

Deadhorse, United States of AmericaTakeoff (climb)

On December 2, 1974, a Mitsubishi MU-2 Marquise (registration N959L) operated by Private United States of America was involved in an aviation accident near Deadhorse, United States of America during takeoff. No fatalities were reported. Investigators recorded the probable cause as: Powerplant failure for undetermined reason. Contributing factors: Failed to obtain/maintain flying speed, exercised poor judgment, airport facilities and runway lighting, engine lost power about liftoff, aircraft veered to right of runway into snow, runway… This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

During takeoff roll, right engine lost power. Pilot lost control, airplane veered off runway and collided with snow bank. All three occupants injured; aircraft damaged beyond repair.

Accident Description

The incident occurred during the takeoff roll while the aircraft was accelerating on the runway. The right engine suddenly lost power, causing an asymmetric thrust condition. The pilot was unable to maintain directional control, and the airplane veered to the right, departing the runway surface. The aircraft then struck a snow bank, resulting in substantial damage. All three occupants were injured, and the aircraft was determined to be beyond economical repair.

Probable Cause and Contributing Factors

According to the official investigation, the probable cause of the accident was a powerplant failure for an undetermined reason. The investigation also identified the following contributing factors:

  • Failure to obtain or maintain flying speed
  • Poor judgment exercised by the pilot
  • Airport facilities and runway lighting issues
  • Engine power loss occurring about the time of liftoff
  • The aircraft veering to the right of the runway into snow
  • An inoperative runway light
  • Dark ambient conditions
  • Ice fog in the area

These factors collectively resulted in the loss of control and subsequent collision.