{"url_path":"/register/2026-06-04/2026-11175","section_key":"summary","section_title":"Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters","topic":"register","document":{"doc_type":"Rule","doc_date":"2026-06-04","source_url":"https://www.federalregister.gov/documents/2026/06/04/2026-11175/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters","accession_number":null,"cik":null,"ticker":null,"issuer_name":null,"edgar_url":null,"primary_entity_key":null,"primary_entity_name":"Transportation Department"},"word_count":121,"has_tables":false,"body_markdown":"# Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters\n\n**Type:** Rule\n**Published:** 2026-06-04\n**Effective:** 2026-07-09\n**Citation:** 91 FR 33595\n**Agencies:** Transportation Department, Federal Aviation Administration\n**Source:** https://www.federalregister.gov/documents/2026/06/04/2026-11175/airworthiness-directives-airbus-helicopters-deutschland-gmbh-helicopters\n\n## Abstract\nThe FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK 117 D-3 helicopters. This AD was prompted by a report of excessive vibrations in-flight due to an incorrect installation of the angular ball bearing of the control ring assembly. This AD requires a one-time inspection of the affected swashplates and, depending on the results of the inspection, corrective actions. This AD prohibits the installation of an affected swashplate on a helicopter, unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products."}