Casualties unknown

Aircraft Strikes Terrain During Foggy Descent in Promontory Mountains (N64005)

Brigham City, UT, US

On December 22, 1985, a Cessna 172 (registration N64005) was involved in an aviation accident near Brigham City, UT. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

An aircraft contacted mountainous terrain while descending through fog after the pilot mistakenly believed he was over an open valley, according to the pilot's statement.

Introduction

An aircraft impacted mountainous terrain during a descent through fog. The pilot provided a statement describing the sequence of events leading to the accident.

Pilot's Account

The pilot stated that after a return flight from Malad, Idaho, he began following a mountain range that he believed would lead him back to Ogden. However, the range guided him southwest of his intended course. He then initiated a descent into fog over what he thought should have been Willard Bay, an open valley. In reality, he was over the Promontory Mountains.

Descent and Impact

At an approximate altitude of 5,000 feet MSL, the passenger observed brush beneath the aircraft. Shortly thereafter, the aircraft impacted terrain.

Conclusion

The aircraft contacted terrain during a descent through fog. No further details regarding the aircraft type, registration, operator, or occupants were provided in the source.

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Frequently asked questions

What happened in the 22 Dec 1985 Cessna 172 accident near Brigham City, UT?

An aircraft contacted mountainous terrain while descending through fog after the pilot mistakenly believed he was over an open valley, according to the pilot's statement.

What aircraft was involved and where did it happen?

The accident on 22 Dec 1985 involved a Cessna 172, registration N64005, at Brigham City, UT.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X38409. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.