# Airworthiness Directives; Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, 412, 412CF, and 412EP Helicopters
> **Rule** · Final rule; request for comments. · Published 2011-06-17 · Effective 2011-07-05 · 76 FR 35334
## Document
- **Document number:** 2011-14247
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 76 FR 35334
- **Publication date:** 2011-06-17
- **Effective date:** 2011-07-05
- **FAA docket:** Docket No. FAA-2011-0561
## Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Bell Helicopter Textron, Inc. (BHT) model helicopters with tail rotor (T[sol]R) blades with certain serial numbers installed. This action requires a one-time inspection of the T[sol]R blade for corrosion or pitting, and repairing or replacing the T[sol]R blade, if that condition is found during the inspection. This amendment is prompted by a report from the manufacturer that T[sol]R blades with certain serial numbers may have manufacturing anomalies in the spar area. These actions are intended to detect corrosion or pitting in the forward spar area of a T[sol]R blade to prevent a crack in the T[sol]R blade, loss of the T[sol]R blade, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/06/17/2011-14247/airworthiness-directives-bell-helicopter-textron-inc-model-205a-205a-1-205b-212-412-412cf-and-412ep)
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