airworthiness · Rule · Final rule; request for comments. · Published 2026-10-01 · Effective 2026-10-16 · 91 FR 62301
Document
Document number
2026-20100
Federal Register citation
91 FR 62301
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Leonardo S.p.a.
Publication date
2026-10-01
Effective date
2026-10-16
FAA docket
Docket No. FAA-2026-11789
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. Model AB139 and AW139 helicopters. This AD was prompted by a report of a nozzle exhaust duct clamp separating from the engine nozzle duct and coming to rest on the tail rotor (TR) drive shaft. This AD requires repetitively inspecting certain clamp assemblies and, depending on the results of the inspection, replacing parts. This AD also prohibits the installation of an affected clamp assembly, unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.