{"abstract":"The FAA proposes to supersede an existing airworthiness directive (AD) that applies to various aircraft equipped with a certain Honeywell Primus II RNZ-850/-851 Integrated Navigation Unit (INU). The existing AD requires inspecting to determine whether Mod L has been done on the Honeywell Primus II NV850 Navigation Receiver Module (NRM), which is part of the INU. In lieu of this inspection, or for aircraft with an NRM having Mod L, the existing AD requires revising the aircraft flight manual to include new limitations for instrument landing system approaches. For aircraft equipped with an NRM having Mod L or aircraft not inspected previously, this proposed AD would require inspecting to determine whether certain other modifications have been done on the NRM; and doing related investigative, corrective, and other specified actions, as applicable. This proposed AD is prompted by reports of erroneous glide slope indications on certain aircraft equipped with subject INUs. We are proposing this AD to ensure that the flightcrew has an accurate glideslope deviation indication. An erroneous glideslope deviation indication could lead to the aircraft making an approach off the glideslope, 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/2005/01/19/05-992.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"70 FR 2982","comment_url":null,"comments_close_on":"2005-03-07","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by March 7, 2005.","disposition_notes":null,"docket_ids":["Docket No. FAA-2005-20080","Directorate Identifier 2003-NM-193-AD"],"dockets":[],"document_number":"05-992","effective_on":null,"end_page":2985,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2005/01/19/05-992.xml","html_url":"https://www.federalregister.gov/documents/2005/01/19/05-992/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/05-992?publication_date=2005-01-19","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2005-01-19/05-992/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":63,"last_updated":"2026-08-26 20:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2005-01-19/pdf/05-992.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2005-01-19","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2005/01/19/05-992.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202410","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202410&RIN=2120-AA64&operation=OPERATION_EXPORT_XML","priority_category":"Routine and Frequent"}},"regulation_id_numbers":["2120-AA64"],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-11-12T14:47:24Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":2982,"subtype":null,"title":"Airworthiness Directives; Various Aircraft Equipped With Honeywell Primus II RNZ-850/-851 Integrated Navigation Units","toc_doc":"Honeywell","toc_subject":"Airworthiness directives:","topics":["Air transportation","Aircraft","Aviation safety","Safety"],"type":"Proposed Rule","volume":70}