{"abstract":"This document proposes to supersede Airworthiness Directive (AD) 98-05-04, which currently requires repetitively inspecting the front and rear wood spars for damage, including installing any necessary inspection holes, on certain American Champion Aircraft Corporation (ACAC) Model 8GCBC airplanes; and repairing or replacing any damaged wood spar. Damage is defined as cracks; compression cracks; longitudinal cracks through the bolt holes or nail holes; or loose or missing nails. The proposed AD would retain the actions of AD 98-05-04; would extend these actions to ACAC 7, 8, and 11 series airplanes; and would incorporate alternative methods of accomplishing the actions. The proposed AD is the result of a review of the service history of the affected airplanes that incorporate wood wing spars. The review was prompted by in-flight wing structural failures on ACAC Model 8GCBC airplanes, and revealed several incidents where damage was found on the front and rear wood spars on the affected airplanes. The actions specified by the proposed AD are intended to prevent possible compression cracks and other damage in the wood spar wing, which, if not detected and corrected, could eventually result in in-flight structural failure of the wing with consequent loss of the airplane.","action":"Notice of proposed rulemaking (NPRM).","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"},{"raw_name":"Federal Aviation Administration","name":"Federal Aviation Administration","id":159,"url":"https://www.federalregister.gov/agencies/federal-aviation-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/159","parent_id":492,"slug":"federal-aviation-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/1999/06/04/99-14131.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"64 FR 29972","comment_url":null,"comments_close_on":"1999-07-16","correction_of":null,"corrections":[],"dates":"Comments must be received on or before July 16, 1999.","disposition_notes":null,"docket_ids":["Docket No. 98-CE-121-AD"],"dockets":[],"document_number":"99-14131","effective_on":null,"end_page":29975,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":null,"html_url":"https://www.federalregister.gov/documents/1999/06/04/99-14131/airworthiness-directives-american-champion-aircraft-corporation-7-8-and-11-series-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/99-14131?publication_date=1999-06-04","mods_url":"https://www.govinfo.gov/metadata/granule/FR-1999-06-04/99-14131/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":20,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-1999-06-04/pdf/99-14131.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"1999-06-04","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/1999/06/04/99-14131.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&RIN=2120-AA64&operation=OPERATION_EXPORT_XML","priority_category":"Routine and Frequent"}},"regulation_id_numbers":["2120-AA64"],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-09-21T05:13:41Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":29972,"subtype":null,"title":"Airworthiness Directives; American Champion Aircraft Corporation 7, 8, and 11 Series Airplanes","toc_doc":null,"toc_subject":null,"topics":[],"type":"Proposed Rule","volume":64}