AD 2024-01-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Various | Various | Airworthiness Directives; Various Helicopters |
Unsafe Condition
Manufacturing defect in screws used inside Pacific Scientific Company buckle part numbers 1111475 (all dash numbers) and 1111548-01, leading to hydrogen embrittlement and potential screwhead separation, which could result in buckle failure to restrain the occupant to the seat.
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Required Actions
Inspect the buckle screws for missing or loose screw heads. Depending on inspection results, replace the buckle and reidentify it, or replace the screws and reidentify the buckle. Prohibit installing affected buckles on helicopters as of the effective date. Replace any Torx head screws (alloy steel) with new hex head screws (stainless steel) before further flight.
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Compliance Time
Within three months of the effective date
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Affected Aircraft
All helicopters with Pacific Scientific Company buckle part numbers 1111475 (all dash numbers) or 1111548-01 installed, if the buckle was manufactured between January 2012 and September 2012, or if the date of manufacture is unknown.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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