No fatalities

Controlled Flight into Terrain After Encountering Downdrafts near Sparrevohn (N4912)

Sparrevohn, United States of AmericaFlight

On October 1, 1979, a Pilatus PC-6 (Porter & Turbo Porter) (registration N4912) operated by Methow Aviation was involved in an aviation accident near Sparrevohn, United States of America in flight. No fatalities were reported. Investigators recorded the probable cause as: Controlled collision with ground during normal due to improper in-flight decisions. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 4 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

Two people were injured and an aircraft destroyed when it crashed in flames near Sparrevohn, Alaska, after the pilot encountered severe downdrafts. The official probable cause was a controlled collision with ground due to improper in-flight decisions.

Accident Details

During a flight from Red Devil to Anchorage, the aircraft was traveling over mountainous terrain when the pilot encountered severe downdrafts. The airplane subsequently crashed in flames on hilly terrain near Sparrevohn. Both occupants suffered injuries and the aircraft was destroyed.

Investigation Findings

The accident investigation determined that the event was a controlled collision with ground. The official probable cause was listed as "Controlled collision with ground during normal due to improper in-flight decisions." Additionally, two contributing factors were identified: downdrafts and wind gusting to 40 knots.

Probable Cause and Contributing Factors

The probable cause, as stated in the official findings, is a controlled collision with ground during normal due to improper in-flight decisions. Contributing factors include downdrafts and wind gusting 40 knots.