AD 2021-04-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Inc. | Various | Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.) Helicopters |
| aircraft | Textron | Inc | Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.) Helicopters |
| aircraft | Bell | Textron Inc | Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously Held by Bell Helicopter Textron Inc.) Helicopters |
Unsafe Condition
The T/R blades sustain greater loads when used on Bell Model 205B helicopters compared to their use on other model helicopters, resulting in failure of the T/R blade and subsequent loss control of the helicopter.
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Required Actions
Determine the total hours time-in-service (TIS) of each T/R blade and remove from service each T/R blade that has accumulated 2,500 or more hours TIS. For each T/R blade that has accumulated less than 2,500 hours TIS, re-identify the P/N on the T/R blade data plate by vibro-etching to change the last three digits of the existing P/N, create a component history card or equivalent record to reflect the change in P/N for each T/R blade, and establish a life limit of 2,500 hours TIS. Revise the Airworthiness Limitations Section of the existing maintenance manual or the Instructions for Continued Airworthiness for your helicopter to establish a life limit of 2,500 hours TIS for each T/R blade.
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Compliance Time
Before further flight
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Affected Aircraft
Bell Textron Inc. (Bell) Model 205B helicopters, certificated in any category, with a tail rotor (T/R) blade part number (P/N) 212-010-750-009, 212-010-750-105, 212-010-750-109, 212-010-750-111, 212-010-750-113, 212-010-750-117, 212-010-750-133, 212-010-750-135, 212-010-750-117FM, or 212-010-750-135FM installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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