{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Covers","items":[{"count":2,"name":"Heath Avn B4","note":"","unit":"aircraft","url":"https://eflight.com/engines/heath-avn-b4"}],"relation":"covers"},{"group":"Held by","items":[{"count":null,"name":"Heath Aviation Company","note":"","unit":"","url":"https://eflight.com/holders/heath-aviation-company"}],"relation":"held by"},{"group":"More","items":[{"count":null,"name":"Every type certificate","note":"","unit":"","url":"https://eflight.com/certificates"},{"count":null,"name":"Who holds what","note":"","unit":"","url":"https://eflight.com/holders"}],"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_document":"https://drs.faa.gov/browse/excelExternalWindow/58B3D62BFD2AC2AA8525676D0046E2EC.0001","holder":"Heath Aviation Company","id":"Group 4-3","models":["B-4"],"name":"Type certificate Group 4-3","product_type":"Engine","type":"certificate","url":"https://eflight.com/certificates/Group 4-3"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}