{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":3,"name":"Mcdonnell Douglas Heli Co 369","note":"","unit":"with this engine series","url":"https://eflight.com/models/mcdonnell-douglas-heli-co/369"},{"count":2,"name":"Md Helicopters Inc 369","note":"","unit":"with this engine series","url":"https://eflight.com/models/md-helicopters-inc/369"}],"relation":"powers"},{"group":"Where they are","items":[{"count":2,"name":"Delaware","note":"","unit":"of these aircraft","url":"https://eflight.com/states/DE"},{"count":1,"name":"Ohio","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OH"},{"count":1,"name":"Florida","note":"","unit":"of these aircraft","url":"https://eflight.com/states/FL"},{"count":1,"name":"Alabama","note":"","unit":"of these aircraft","url":"https://eflight.com/states/AL"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":1,"name":"Manatee County Mosquito Control District","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/manatee-county-mosquito-control-district"},{"count":1,"name":"Hlh Leasing LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/hlh-leasing-llc"},{"count":1,"name":"Heliservice LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/heliservice-llc"}],"relation":"owned by"},{"group":"Airworthiness","items":[{"count":402,"name":"Failure reports on the Allison (Rolls-Royce) 250-C30","note":"","unit":"reports since 1995","url":"https://eflight.com/engines/allison-rolls-royce-250-c30#airworthiness"}],"relation":"subject to"},{"group":"Analytics","items":[{"count":null,"name":"The fleet by engine type","note":"","unit":"","url":"https://eflight.com/analytics/fleet"},{"count":null,"name":"Every engine series","note":"","unit":"","url":"https://eflight.com/engines"}],"relation":"compared in"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"aircraft":5,"horsepower":650,"id":"allison-rolls-royce-250-c30","maker":"Allison (Rolls-Royce)","name":"Allison (Rolls-Royce) 250-C30","thrust_lb":null,"type":"Turboshaft","url":"https://eflight.com/engines/allison-rolls-royce-250-c30"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}