Casualties unknown

Aircraft Located in Remote Cascade Pass After Three-Day Search (N3581Y)

Diamond Lake, OR, US

On September 29, 1989, a Cessna 182F (registration N3581Y) was involved in an aviation accident near Diamond Lake, OR. Investigators recorded the probable cause as: IMPROPER INFLIGHT PLANNING AND DECISION BY THE PILOT IN COMMAND WHO CONTINUED VFR FLIGHT INTO IMC CONDITIONS WHILE ATTEMPTING TO FLY THROUGH A MOUNTAIN PASS. 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 2026-06-22Data APIEditorial standards

Wreckage was found three days after the accident in a remote mountain pass, following the passage of a frontal weather system that cleared low clouds and visibility issues.

What happened

The aircraft's emergency locator transmitter (ELT) signal was successfully received by search and rescue personnel. However, an immediate aerial search for the wreckage could not be conducted due to poor weather conditions in the area. Witnesses on the ground reported that low ceiling heights, rain, and fog were present in the vicinity on the day of the accident.

The aircraft wreckage was eventually located three days after the incident occurred. The site was situated at an altitude of 5,200 feet mean sea level (MSL) within a remote mountain pass. This specific location is noted as a frequently used visual flight rules (VFR) route through the Cascade Mountains.

The investigation

The passage of a frontal weather system cleared the low clouds and visibility issues that had previously prevented aerial search efforts, allowing for the recovery of the wreckage.

Frequently asked questions

What happened in the 29 Sept 1989 Cessna 182F accident near Diamond Lake, OR?

Wreckage was found three days after the accident in a remote mountain pass, following the passage of a frontal weather system that cleared low clouds and visibility issues.

What aircraft was involved and where did it happen?

The accident on 29 Sept 1989 involved a Cessna 182F, registration N3581Y, at Diamond Lake, OR.

What was the probable cause of the accident?

IMPROPER INFLIGHT PLANNING AND DECISION BY THE PILOT IN COMMAND WHO CONTINUED VFR FLIGHT INTO IMC CONDITIONS WHILE ATTEMPTING TO FLY THROUGH A MOUNTAIN PASS. CONTRIBUTING FACTORS WERE THE LOW CEILING AND RAIN WEATHER CONDITIONS AND THE MOUNTAINOUS, HILLY TERRAIN IN THE PASS.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X29489. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.