airworthiness · Rule · Final rule. · Published 2023-08-03 · Effective 2023-09-07 · 88 FR 51220
Document
Document number
2023-16554
Federal Register citation
88 FR 51220
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Airbus
Publication date
2023-08-03
Effective date
2023-09-07
FAA docket
Docket No. FAA-2023-0937
Abstract
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model EC155B1 helicopters. This AD was prompted by reports of failure of the main gearbox (MGB) oil cooling fan hub (fan hub). This AD requires, for helicopters with an affected part (fan hub) installed, using an endoscope, repetitively inspecting the fan hub, including the area around the fan hub attachment screws, for a crack. Depending on the inspection results, this AD requires performing additional inspections and replacing an affected fan hub. This AD also allows an affected fan hub to be installed on a helicopter if certain actions are accomplished, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.