{"abstract":"This amendment supersedes an existing airworthiness directive (AD), applicable to Hamilton Standard Models 14RF-9, 14RF-19, 14RF-21; and 14SF-5, 14SF-7, 14SF-11, 14SFL11, 14SF-15, 14SF-17, 14SF-19, and 14SF-23; and Hamilton Standard/British Aerospace 6/5500/F propellers, that currently requires that all blades of applicable Hamilton Standard propellers be calibrated for ultrasonic transmissibility before conducting the ultrasonic shear wave inspection. In addition, that AD decreases the repetitive inspection interval for the Hamilton Standard Models 14RF-9, 14SF-5, -7, -11, -15, -17, -19, and -23 propellers from 1,250 flight cycles to 500 flight cycles. That AD also establishes a new ultrasonic shear wave inspection interval of 1,000 flight cycles for the Hamilton Standard Model 14RF-19, and 2,500 flight cycles for the Hamilton Standard Model 14RF-21 and Hamilton Standard/British Aerospace Model 6/5500/F. Also, that AD removes Hamilton Standard Model 14SFL11 propellers from service. This amendment requires a blade repair that constitutes terminating action to the repetitive ultrasonic taper bore inspections. Repetitive ultrasonic taper bore inspections are required until the blade is repaired in accordance with this AD. This amendment is prompted by the development of a taper bore repair process that removes the damaged material and returns the blade to a condition that does not require repetitive ultrasonic taper bore inspections. The actions specified by this AD are intended to prevent separation of a propeller blade due to cracks initiating in the blade taper bore, that can result in aircraft damage, and possible loss of aircraft control.","action":"Final rule; request for comments.","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"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/1996/04/24/96-9806.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"61 FR 18052","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Effective May 9, 1996.","disposition_notes":null,"docket_ids":["Docket No. 96-ANE-05","Amendment 39-9568","AD 96-08-02"],"dockets":[],"document_number":"96-9806","effective_on":"1996-05-09","end_page":18058,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":null,"html_url":"https://www.federalregister.gov/documents/1996/04/24/96-9806/airworthiness-directives-hamilton-standard-models-14rf-9-14rf--19-14rf-21-and-14sf-5-14sf-7-14sf-11","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/96-9806?publication_date=1996-04-24","mods_url":"https://www.govinfo.gov/metadata/granule/FR-1996-04-24/96-9806/mods.xml","not_received_for_publication":null,"page_length":7,"page_views":{"count":278,"last_updated":"2026-09-20 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-1996-04-24/pdf/96-9806.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"1996-04-24","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/1996/04/24/96-9806.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-09-21T03:14:18Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":18052,"subtype":null,"title":"Airworthiness Directives; Hamilton Standard Models 14RF-9, 14RF- 19, 14RF-21; and 14SF-5, 14SF-7, 14SF-11, 14SFL11, 14SF-15, 14SF-17, 14SF-19, and 14SF-23; and Hamilton Standard/British Aerospace 6/5500/F Propellers","toc_doc":null,"toc_subject":null,"topics":[],"type":"Rule","volume":61}