{"as_of":"2026-11-03","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Aircraft","items":[{"count":null,"name":"N4101D: not on the register today","note":"the record of its deregistration","unit":"","url":"https://eflight.com/aircraft/N4101D"},{"count":16,"name":"Helio H-391","note":"the model family and its accident history","unit":"registered today","url":"https://eflight.com/models/helio/h-391"},{"count":120,"name":"Helio","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/helio"},{"count":33,"name":"Engine: Lycoming GO-435","note":"as the NTSB recorded it","unit":"aircraft carry this series today","url":"https://eflight.com/engines/lycoming-go-435"}],"relation":"involved"},{"group":"Place","items":[{"count":null,"name":"Bozeman Yellowstone International","note":"departed from","unit":"","url":"https://eflight.com/airports/BZN"},{"count":1121,"name":"Accidents and incidents in Montana","note":"166 in the last ten years","unit":"since 1982","url":"https://eflight.com/accidents?state=MT"},{"count":6047,"name":"Montana","note":"","unit":"aircraft registered","url":"https://eflight.com/states/MT"}],"relation":"at or near"},{"group":"Analytics","items":[{"count":null,"name":"Accidents over time since 1982","note":"","unit":"","url":"https://eflight.com/analytics/accidents-over-time"},{"count":null,"name":"Accidents by phase of flight, weather and hour","note":"","unit":"","url":"https://eflight.com/analytics/accidents-by-phase"},{"count":null,"name":"The accident map","note":"","unit":"","url":"https://eflight.com/analytics/accident-map"}],"relation":"counted in"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"city":"Bozeman","date":"1985-12-06","fatalities":0,"id":"DEN86LA040","name":"Helio H-391B accident near Bozeman, Montana, December 6, 1985","state":"MT","type":"ACC","url":"https://eflight.com/accidents/DEN86LA040"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}