AD 98-23-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
Unsafe Condition
Cracking in Kaynar Technologies, Inc. manufactured barrel nuts, part number NAS577B-10A, due to hydrogen embrittlement introduced during manufacture, which could lead to failure of main rotor grips, pitch horns, or tailboom assemblies.
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Required Actions
Determine if barrel nuts were manufactured by Kaynar Technologies Inc. using specified service bulletins, inspect Kaynar-manufactured 'thin' flange barrel nuts with a 10-power or higher magnifying glass for cracks or lubrication residue in the threaded portion, and replace cracked or residue-containing barrel nuts and corresponding bolts with airworthy parts.
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Compliance Time
Required within 40 hours time-in-service, unless accomplished previously.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST helicopters, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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