{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Aircraft","items":[{"count":null,"name":"N33SV on the register today","note":"the tail number may have moved to another aircraft since","unit":"","url":"https://eflight.com/aircraft/N33SV"},{"count":11,"name":"Agusta A109","note":"the model family and its accident history","unit":"registered today","url":"https://eflight.com/models/agusta/a109"},{"count":12,"name":"Agusta","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/agusta"},{"count":113,"name":"Engine: Allison 250-C20B","note":"as the NTSB recorded it","unit":"aircraft carry this series today","url":"https://eflight.com/engines/allison-rolls-royce-250-c20b"}],"relation":"involved"},{"group":"Place","items":[{"count":null,"name":"Joe Foss Field","note":"nearest airport","unit":"","url":"https://eflight.com/airports/FSD"},{"count":null,"name":"Sanford Usd Medical Center Heliport","note":"departed from","unit":"","url":"https://eflight.com/airports/1SD9"},{"count":469,"name":"Accidents and incidents in South Dakota","note":"69 in the last ten years","unit":"since 1982","url":"https://eflight.com/accidents?state=SD"},{"count":2276,"name":"South Dakota","note":"","unit":"aircraft registered","url":"https://eflight.com/states/SD"}],"relation":"at or near"},{"group":"Record","items":[{"count":1,"name":"Other NTSB records under N33SV","note":"the number may have belonged to another aircraft at the time","unit":"records","url":"https://eflight.com/accidents/DEN88LA094#others"}],"relation":"related to"},{"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":"Sioux Falls","date":"1988-04-09","fatalities":0,"id":"DEN88LA094","name":"Agusta A109A accident near Sioux Falls, South Dakota, April 9, 1988","state":"SD","type":"ACC","url":"https://eflight.com/accidents/DEN88LA094"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}