AD 2024-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Various | Various | Airworthiness Directives; Various Helicopters |
Unsafe Condition
A manufacturing defect in the screws used inside Pacific Scientific Company buckles P/N 1111475 (all dash numbers) and P/N 1111548-01, which are susceptible to hydrogen embrittlement due to improper baking during the electroplating process, leading to the screwhead separating from the body of the screw when under load, which could result in the buckle failing to restrain the occupant to the seat.
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Required Actions
Inspect each buckle screw for cracked, loose, and missing screw heads, and depending on the results, reassemble the buckle (if necessary) and reidentify it with 'INS. A' or replace each Torx head screw with a hex head screw, reassemble the buckle, and reidentify the buckle with 'MOD. A.' If a screw head broke off during disassembly, replace the buckle with an airworthy buckle. Also, prohibit installing an identified buckle unless it is marked with 'MOD. A' or 'INS. A.'
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Compliance Time
Within 50 flight hours
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Affected Aircraft
All helicopters with a Pacific Scientific Company buckle part number (P/N) 1111475 (all dash numbers) or P/N 1111548-01 installed, if the buckle was manufactured between January 2012 and April 2013 inclusive or has an unknown date of manufacture (DOM).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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