AD 86-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST Helicopters |
Unsafe Condition
Failure of the main rotor yoke assembly due to fatigue cracking.
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Required Actions
Remove and replace the main rotor yoke assembly not later than 2,500 hours time in service. For yoke assemblies with over 2,450 hours as of July 1, 1986, replace within next 50 hours time in service or by July 1, 1986, whichever comes first.
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Compliance Time
Not later than 2,500 hours time in service. For those with over 2,450 hours as of July 1, 1986, within next 50 hours time in service or by July 1, 1986, whichever comes first.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214ST helicopters, serial numbers 18401, 18402, 18403, and 28101 through 28159, equipped with main rotor yoke assembly P/N 214-010-105-001.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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