EASA AD US-2024-01-11: Superseded by FAA AD 2024-20-04

What to do

Operators of helicopters with the specified Pacific Scientific Company buckles must inspect the buckle screws within three months of the AD's effective date, February 15, 2024. Depending on inspection outcomes, they must reidentify the buckle, replace the screws with approved stainless steel hex head screws, or replace the entire buckle with an airworthy unit. Installation of affected buckles is prohibited from the effective date onward.

Summary

FAA Airworthiness Directive 2024-01-11 is a final rule addressing an unsafe condition in certain Pacific Scientific Company rotary buckle assemblies installed on various helicopters. The affected buckles, part numbers 1111475 (all dash numbers) and 1111548-01, were manufactured between January 2012 and September 2012 and contain screws susceptible to hydrogen embrittlement, risking buckle failure during occupant restraint. This directive applies specifically to helicopters and requires inspection and possible replacement of the buckles or screws to ensure safety.

What changed

This new airworthiness directive introduces mandatory inspections of the affected buckle screws and requires reidentification, replacement of screws with stainless steel hex head screws, or replacement of the entire buckle depending on inspection results. It also prohibits the installation of the affected buckles on helicopters as of the effective date. Unlike the related service bulletins, this AD enforces a strict compliance timeline of three months and requires immediate replacement of any buckle with damaged or broken screws.

Why it matters

This AD is critical for aviation professionals because it addresses a manufacturing defect that could lead to buckle failure, compromising occupant restraint during accidents or severe turbulence. Operators, maintenance organizations, and compliance teams must act promptly to mitigate safety risks and ensure regulatory compliance. Failure to comply could result in unsafe flight conditions and regulatory penalties.