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Casualties unknown

Pilot Reports Engine Power Loss and Runway Excursion During Takeoff (N99SR)

Broomfield, CO, US

On January 19, 1990, a Mitsubishi MU-2B-25 (registration N99SR) was involved in an aviation accident near Broomfield, CO. Investigators recorded the probable cause as: The left engine lost RPM during takeoff ground roll, resulting in loss of directional control. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

During takeoff ground roll, the left engine lost RPM, causing loss of directional control. The aircraft departed the runway, struck a sign and lights, skidded 3000 feet, and nosed down in a ditch. Heavy snow and snow-covered runway were present.

Accident Sequence

The pilot reported that during the takeoff ground roll, the left engine lost RPM. This loss of RPM caused the pilot to lose directional control of the aircraft. As a result, the aircraft departed the left side of the runway. It struck a runway sign and two runway lights. Following the impact, the aircraft skidded sideways for a distance of 3000 feet. During the sideways skid, the aircraft crossed the runway. Finally, the aircraft nosed down in a ditch and came to rest.

Environmental Conditions

At the time of the accident, heavy snow showers were in progress. The runway surface was covered with snow.

Probable cause

The left engine lost RPM during takeoff ground roll, resulting in loss of directional control.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22411. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.