Casualties unknown

1994-07-05: Mooney M20C (N6959U) — Cassel, John F. — Las Vegas, NV

Las Vegas, NV, US

On July 5, 1994, a Mooney M20C (registration N6959U) operated by Cassel, John F. was involved in an aviation accident near Las Vegas, NV. Investigators recorded the probable cause as: The pilot's failure to ensure adequate takeoff performance given the runway length and density altitude, which resulted in a collision with terrain after failing to become airborne. 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 1781061362Data APIEditorial standards

An aircraft failed to become airborne during takeoff from a short gravel runway and struck a dirt embankment, resulting in damage but no reported injuries.

What happened

The pilot initiated a takeoff roll on a relatively short 2,100-foot gravel runway. Environmental conditions at the time included a density altitude of approximately 4,200 feet and a crosswind component from the left at 12 knots. Despite these factors, the aircraft was unable to achieve sufficient lift to become airborne within the available runway length. Consequently, the aircraft overran the paved surface and collided with a dirt embankment located just past the departure end of the runway.

The investigation

Following the incident, the pilot provided a statement regarding the condition of the aircraft. It was reported that there were no mechanical issues or system failures contributing to the event. Notably, the aircraft had recently undergone an annual inspection, suggesting it was in a serviceable state prior to the flight.

Findings

The primary factor in this accident appears to be the inability to generate adequate lift during the takeoff phase. The combination of high density altitude and limited runway length likely resulted in insufficient performance margins. The pilot's decision to attempt departure under these conditions, without accounting for the reduced acceleration and climb gradient capabilities, led directly to the overrun.

Probable cause

The pilot's failure to ensure adequate takeoff performance given the runway length and density altitude, which resulted in a collision with terrain after failing to become airborne.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001206X01772. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.