{"abstract":"The FAA proposes to supersede an existing airworthiness directive (AD) that applies to various aircraft equipped with certain Honeywell Primus II RNZ-850( )/-851( ) integrated navigation units (INUs). The existing AD, as one alternative for compliance, provides for a one-time inspection to determine whether a certain modification has been installed on the Honeywell Primus II NV-850 navigation receiver module (NRM), which is part of the INU. In lieu of accomplishing this inspection, and for aircraft found to have an affected NRM, that AD provides for revising the aircraft flight manual to include new limitations for instrument landing system approaches. That AD also requires an inspection to determine whether certain other modifications have been done on the NRM; and doing related investigative, corrective, and other specified actions, as applicable; as well as further modifications to address additional anomalies. This proposed AD would extend the compliance time for a certain inspection and associated actions. This proposed AD would also revise the applicability to include additional affected INUs. This proposed AD results from reports indicating that erroneous localizer and glideslope indications have occurred on certain aircraft equipped with the subject INUs. We are proposing this AD to ensure that the flight crew has accurate localizer and glideslope deviation indications. An erroneous localizer or glideslope deviation indication could lead to the aircraft making an approach off the localizer, which could result in impact with an obstacle or terrain.","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/2008/05/19/E8-11104.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"73 FR 28751","comment_url":null,"comments_close_on":"2008-07-03","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by July 3, 2008.","disposition_notes":null,"docket_ids":["Docket No. FAA-2008-0556","Directorate Identifier 2007-NM-028-AD"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2008-0556-0007"},{"title":"U.S. DOT/FAA - Additional Information","document_id":"FAA-2008-0556-0002"}],"agency_name":"FAA","documents":[{"comment_count":4,"comment_start_date":"2008-05-19","updated_at":"2024-06-01T01:01:21.831-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2008-0556-0001","allow_late_comments":null,"id":"FAA-2008-0556-0001","comment_end_date":"2008-07-04","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2008-0556","title":"2007-NM-028-AD\r\nVarious Aircraft Equipped With Honeywell Primus II RNZ‑850( )/-851( ) Integrated Navigation Units\r\n"}],"document_number":"E8-11104","effective_on":null,"end_page":28754,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2008/05/19/E8-11104.xml","html_url":"https://www.federalregister.gov/documents/2008/05/19/E8-11104/airworthiness-directives-various-aircraft-equipped-with-honeywell-primus-ii-rnz-850--851--integrated","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/E8-11104?publication_date=2008-05-19","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2008-05-19/E8-11104/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":87,"last_updated":"2026-08-25 08:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2008-05-19/pdf/E8-11104.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2008-05-19","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2008/05/19/E8-11104.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":{"supporting_documents":[{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2008-0556-0007"},{"title":"U.S. DOT/FAA - Additional Information","document_id":"FAA-2008-0556-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":4,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2008-0556","supporting_documents_count":2,"docket_id":"FAA-2008-0556","document_id":"FAA-2008-0556-0001","regulation_id_number":"2120-AA64","title":"2007-NM-028-AD\r\nVarious Aircraft Equipped With Honeywell Primus II RNZ‑850( )/-851( ) Integrated Navigation Units\r\n","checked_regulationsdotgov_at":"2024-06-02T01:00:07Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":28751,"subtype":null,"title":"Airworthiness Directives; Various Aircraft Equipped With Honeywell Primus II RNZ-850( )/-851(-) Integrated Navigation Units","toc_doc":"Various Aircraft Equipped With Honeywell Primus II RNZ 850 etc., Integrated Navigation Units","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Safety"],"type":"Proposed Rule","volume":73}