Casualties unknown

Aircraft Failed to Clear Obstacles After Takeoff from an Upslope Sod Strip (N8560H)

Denison, TX, US

On October 20, 1991, a North American NAVION (registration N8560H) operated by Dean S. Emerson was involved in an aviation accident near Denison, TX. Investigators recorded the probable cause as: THE EXCEEDING OF THE AIRPLANE'S TAKEOFF PERFORMANCE CAPABILITY BY THE PILOT'S INADEQUATE PREFLIGHT PREPARATION.. 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 2026-09-03Data APIEditorial standards

An airplane failed to establish an adequate climb after liftoff from a 1,500-foot upslope sod strip in calm winds. It struck a 30-foot power pole 1,800 feet from the departure end.

Incident Overview and Initial Climb Issues According to the pilot and witnesses, the airplane did not establish an adequate climb after initial liftoff. The aircraft cleared 20-foot trees at the end of the runway but failed to clear a 30-foot power pole crossbar and wires. ## Runway Conditions and Performance Data The takeoff was attempted in calm winds from a 1,500-foot sod strip with an uphill slope. Performance data indicated that, for the conditions existing at the time, the airplane required an 875-foot ground run and 1,775 feet to clear a 50-foot obstacle. The airplane struck the power pole 1,800 feet from the departure end of the runway. ## Limitations of the Performance Data The performance data did not account for the sod runway surface or the upslope. The pilot stated in his report that, given the opportunity to do it again, he would not have attempted the takeoff under the same conditions.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18303. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.