{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Models most reported","items":[{"count":333,"name":"Messerschmitt-Bolkow-Blohm BK 117","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/messerschmitt-bolkow-blohm/bk-117#airworthiness"},{"count":235,"name":"Robinson R44","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/robinson/r44#airworthiness"},{"count":217,"name":"Robinson R22","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/robinson/r22#airworthiness"},{"count":147,"name":"Bell 407","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/bell/407#airworthiness"},{"count":83,"name":"Airbus Helicopters EC-135 now H135","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/airbus-helicopters/ec-135#airworthiness"},{"count":75,"name":"Bell 206 JetRanger and LongRanger","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/bell/206#airworthiness"},{"count":65,"name":"Agusta Aerospace Corp AW139","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/agusta-aerospace-corp/aw139#airworthiness"},{"count":53,"name":"Airbus Helicopters AS350 AStar (\u00c9cureuil), now H125","note":"","unit":"failure reports in ten years","url":"https://eflight.com/models/airbus-helicopters/as350#airworthiness"}],"relation":"reported on"},{"group":"Engine series most reported","items":[{"count":153,"name":"Lycoming O-360-J2A","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/lycoming-o-360-j2a#airworthiness"},{"count":126,"name":"Lycoming IO-540-AE1A5","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/lycoming-io-540-ae1a5#airworthiness"},{"count":85,"name":"Lycoming O-540-F1B5","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/lycoming-o-540-f1b5#airworthiness"},{"count":34,"name":"Allison (Rolls-Royce) 250-C47B","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/allison-rolls-royce-250-c47b#airworthiness"},{"count":22,"name":"Turbomeca (Safran) ARRIEL 2B1","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/turbomeca-safran-arriel-2b1#airworthiness"},{"count":17,"name":"Allison (Rolls-Royce) 250-C20B","note":"","unit":"failure reports in ten years","url":"https://eflight.com/engines/allison-rolls-royce-250-c20b#airworthiness"}],"relation":"reported on"},{"group":"Orders","items":[{"count":0,"name":"FAA orders on rotorcraft systems","note":"","unit":"airworthiness directives","url":"https://eflight.com/directives?system=rotorcraft"}],"relation":"governed by"},{"group":"More","items":[{"count":null,"name":"Every aircraft system","note":"","unit":"","url":"https://eflight.com/systems"},{"count":null,"name":"Every FAA order","note":"","unit":"","url":"https://eflight.com/directives"}],"relation":"see also"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"faa_orders":0,"failure_reports_10_years":1495,"id":"rotorcraft","name":"Rotorcraft systems","type":"system","url":"https://eflight.com/systems/rotorcraft"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}