{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Covers","items":[{"count":197,"name":"Piper J4 Cub Coupe","note":"","unit":"registered","url":"https://eflight.com/models/piper/j4"}],"relation":"covers"},{"group":"Held by","items":[{"count":null,"name":"Piper Aircraft INC.","note":"","unit":"","url":"https://eflight.com/holders/piper-aircraft-inc"}],"relation":"held by"},{"group":"Orders","items":[{"count":9,"name":"FAA orders on these designs","note":"","unit":"airworthiness directives","url":"https://eflight.com/certificates/TC 721"},{"count":null,"name":"2025-02-11: Rudder Structure","note":"2025-03-20","unit":"","url":"https://eflight.com/directives/2025-02-11"},{"count":null,"name":"2015-08-04: Wings","note":"2015-06-03","unit":"","url":"https://eflight.com/directives/2015-08-04"},{"count":null,"name":"99-01-05 R1: Wings","note":"2014-01-14","unit":"","url":"https://eflight.com/directives/99-01-05 R1"},{"count":null,"name":"99-01-05: Wing Lift Struts or Forks","note":"1999-02-08","unit":"","url":"https://eflight.com/directives/99-01-05"}],"relation":"subject to"},{"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/C201C0D38EEBB808862572C9006EDCD1.0001","holder":"Piper Aircraft Inc.","id":"TC 721","models":["J4F"],"name":"Type certificate TC 721","product_type":"Aircraft","type":"certificate","url":"https://eflight.com/certificates/TC 721"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}