Casualties unknown

Float-equipped aircraft stalls during approach at Shannon Pond (N4454Z)

Dillingham, AK, US

On July 26, 1987, a Piper PA-18-150 (registration N4454Z) operated by H. W. Brunnhoelzl Iii was involved in an aviation accident near Dillingham, AK. Investigators recorded the probable cause as: The pilot's inability to recover from a stall that occurred at a higher than normal indicated airspeed during the approach, influenced by squirrely wind conditions with shear near the tree line. 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 float-equipped airplane stalled at an unusually high airspeed during a landing approach near Shannon Pond, resulting in a crash into wet tundra amid turbulent wind conditions.

What happened

The accident occurred while the pilot was conducting an approach for landing with a float-equipped aircraft. During this phase of flight, the airplane experienced a stall at an indicated airspeed that was higher than normal for the situation. Despite the unusual nature of the stall, the pilot attempted to recover but was unable to regain control of the aircraft. Consequently, the airplane crashed into the surrounding wet tundra terrain.

The investigation

Investigative details regarding mechanical examination were not provided in the source material. However, environmental conditions at the time of the accident were noted as significant factors. Winds at Shannon Pond were described as 'squirrely,' characterized by shear winds near or at the tree line. These turbulent wind conditions likely contributed to the difficulty in maintaining stable flight during the approach.

Findings

The primary finding was that the stall occurred at a higher than normal indicated airspeed, which prevented effective recovery. The presence of shear winds and 'squirrely' conditions near the tree line created a hazardous environment for the final approach. The combination of these aerodynamic factors led to the loss of control and subsequent impact with the ground.

Safety message

Pilots operating float-equipped aircraft in areas with complex terrain and variable wind patterns should remain vigilant for unexpected stall characteristics. Understanding how shear winds near tree lines can affect airspeed indications and aircraft performance is critical for safe landing operations.

Probable cause

The pilot's inability to recover from a stall that occurred at a higher than normal indicated airspeed during the approach, influenced by squirrely wind conditions with shear near the tree line.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X31372. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.