1 fatality

Non-Instrument Rated Pilot Crashes into Trees Near Ridgeline After Departing Despite VFR Not Recommended (N6434R)

Monarch, MT, US

On May 29, 1992, a Piper PA-28-140 (registration N6434R) operated by Chamberlain, Dwight N. was involved in an aviation accident near Monarch, MT. One person was killed. Investigators recorded the probable cause as: THE PILOT IN COMMAND'S DISREGARD OF THE WEATHER FORECAST AND FAILURE TO MAINTAIN CLEARANCE WITH TREES/TERRAIN. 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 2026-07-04Data APIEditorial standards

A non-instrument rated pilot departed Priest River en route to Lewistown after a weather briefing where VFR flight was not recommended, colliding with trees near a 7,650-foot ridgeline approximately 50 nautical miles from destination.

Accident Details

A non-instrument rated pilot departed Priest River, Idaho, en route to Lewistown, Idaho, after receiving a weather briefing during which visual flight rules (VFR) flight was not recommended. Approximately 50 nautical miles short of the destination, over hilly and mountainous terrain, the aircraft collided with trees near the top of a 7,650-foot ridgeline and crashed.

Pilot Report

The pilot reported low ceilings and 1.5 miles visibility restricted by moderate rain and clouds at the time of the accident. He further reported a loss of altitude at full power while approaching the ridgeline, which was not attributed to any aircraft malfunction.

Circumstances

No other details about the aircraft, registration, operator, occupants, injuries, or damage were provided. The accident occurred in mountainous terrain under adverse weather conditions.

Frequently asked questions

What happened in the 29 May 1992 Piper PA-28-140 accident near Monarch, MT?

A non-instrument rated pilot departed Priest River en route to Lewistown after a weather briefing where VFR flight was not recommended, colliding with trees near a 7,650-foot ridgeline approximately 50 nautical miles from destination.

Were there any fatalities in the 29 May 1992 Piper PA-28-140 accident?

The accident was fatal, resulting in 1 fatality.

What aircraft was involved and where did it happen?

The accident on 29 May 1992 involved a Piper PA-28-140, registration N6434R, operated by Chamberlain, Dwight N., at Monarch, MT.

What was the probable cause of the accident?

THE PILOT IN COMMAND'S DISREGARD OF THE WEATHER FORECAST AND FAILURE TO MAINTAIN CLEARANCE WITH TREES/TERRAIN. FACTORS CONTRIBUTING TO THE ACCIDENT WERE: HILLY/MOUNTAINOUS TERRAIN, WEATHER CONDITIONS: RAIN, LOW CEILINGS AND DOWNDRAFTS, TREES AND THE PILOT IN COMMAND'S CONTINUED FLIGHT INTO KNOWN ADVERSE WEATHER.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X14740. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.