Casualties unknown

Tailwheel Aircraft Collides with Beach Debris During Takeoff from Sloped Sand Bar (N8469D)

Montague Island, AK, US

On September 17, 1984, a Piper PA-18A (registration N8469D) was involved in an aviation accident near Montague Island, AK. Investigators recorded the probable cause as: The pilot's failure to maintain directional control during takeoff due to premature tailwheel lift on a soft, sloped sand bar. 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

A tailwheel aircraft lost directional control during takeoff from a soft, sloped sand bar, drifting downslope to collide with beach debris.

What happened

The pilot was attempting to initiate takeoff from a sand bar that presented two distinct challenges: the surface was soft, and it sloped downward to the right toward the water. During the initial phase of the takeoff roll, the aircraft's tailwheel lifted prematurely. This early rotation prevented the pilot from maintaining directional control using the rudder alone. Consequently, the aircraft drifted downslope toward the water and collided with debris (jetsam) found on the beach.

The investigation

The factual narrative indicates that the combination of a soft surface and a downward slope contributed to the loss of control. The premature raising of the tailwheel during the takeoff roll was a critical factor in the inability to maintain directional control.

Findings

  • Loss of directional control due to premature tailwheel lift on a sloped, soft surface.
  • Collision with beach debris after drifting downslope toward the water.
  • Environmental factors included a sand bar that was both soft and sloped to the right.

Safety message

Takeoff from unprepared surfaces such as sand bars requires careful assessment of slope and surface firmness. Premature rotation on sloped terrain can compromise directional control, particularly in tailwheel aircraft.

Probable cause

The pilot's failure to maintain directional control during takeoff due to premature tailwheel lift on a soft, sloped sand bar.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X40952. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.