United States Government Publishing Office publisher pbl distributor dst United States National Archives and Records Administration Office of the Federal Register author aut Government Organization text government publication eng FR Regulatory Information 2026_register executive 2026-05-21 article Rules and Regulations D09002ee1e1e8bf1e D09002ee1e1e8bf90 United States Department of Transportation originator org United States Government Agency or Subagency United States Federal Aviation Administration originator org United States Government Agency or Subagency The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (BTCL) Model 407 helicopters. This AD was prompted by a determination that chafing can occur at various locations on the electrical harnesses located in the aircraft instrument panel area. This AD requires a one-time detailed visual inspection of the electrical harnesses for chafing and corrective actions if necessary. This AD also requires rotation of the backshell cast housing of connectors of the lower engine airframe unit and installation of a wire harness bracket and support, and for certain helicopters, installation of a wire bundle sleeve. The FAA is issuing this AD to address the unsafe condition on these products. 91 FR 29888 https://www.govinfo.gov/app/details/FR-2026-05-21/2026-10167 2026-10167 fr21my26-2 RIN 2120-AA64 4910-13-P Docket No. FAA-2026-0736 Project Identifier MCAI-2025-00698-R Amendment 39-23344 AD 2026-10-04 https://www.govinfo.gov/app/details/FR-2026-05-21/2026-10167 https://www.govinfo.gov/content/pkg/FR-2026-05-21/html/2026-10167.htm https://www.govinfo.gov/content/pkg/FR-2026-05-21/pdf/2026-10167.pdf Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety 3 p. 29888 29890 91 FR 29888 Title 14 Part 39 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Bell Textron Canada Limited Helicopters; Federal Register Vol. 91, Issue RULE 2026-10167 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 2026-06-25 Docket No. FAA-2026-0736 Project Identifier MCAI-2025-00698-R Amendment 39-23344 AD 2026-10-04 4910-13-P 2026-10167 Final rule.

The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (BTCL) Model 407 helicopters. This AD was prompted by a determination that chafing can occur at various locations on the electrical harnesses located in the aircraft instrument panel area. This AD requires a one-time detailed visual inspection of the electrical harnesses for chafing and corrective actions if necessary. This AD also requires rotation of the backshell cast housing of connectors of the lower engine airframe unit and installation of a wire harness bracket and support, and for certain helicopters, installation of a wire bundle sleeve. The FAA is issuing this AD to address the unsafe condition on these products.

This AD is effective June 25, 2026 Matthew Williams, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (316) 946-4134; email: matthew.t.williams@faa.gov. Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety Airworthiness Directives Bell Textron Canada Limited Helicopters, AMOC@faa.gov fr.inspection@nara.gov matthew.t.williams@faa.gov TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca regulations.gov www.archives.gov/federal-register/cfr/ibr-locations Vol. 91, no. 98 Office of the Federal Register, National Archives and Records Administration 2026-05-21 continuing daily deposited born digital 320 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-2026-05-21 P0b002ee1e1e8bb9d 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr21my26 https://www.govinfo.gov/app/details/FR-2026-05-21 https://www.govinfo.gov/content/pkg/FR-2026-05-21/pdf/FR-2026-05-21.pdf https://www.govinfo.gov/content/pkg/FR-2026-05-21/xml/FR-2026-05-21.xml fdlp 29879 30190 DGPO 2026-05-21 2026-05-21 FR-2026-05-21 machine generated eng FR FR-2026-05-21 91 98