# Damage Tolerance and Fatigue Evaluation of Composite Rotorcraft Structures
> **Rule** · Final rule. · Published 2011-12-01 · Effective 2012-01-30 · 76 FR 74655
## Document
- **Document number:** 2011-30945
- **Category:** other
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 74655
- **Publication date:** 2011-12-01
- **Effective date:** 2012-01-30
- **FAA docket:** Docket No.: FAA-2009-0660
## Abstract

This rule revises airworthiness standards for type certification requirements of normal and transport category rotorcraft. The amendment requires evaluation of fatigue and residual static strength of composite rotorcraft structures using a damage tolerance evaluation, or a fatigue evaluation if the applicant establishes that a damage tolerance evaluation is impractical. The amendment addresses advances in composite structures technology and provides internationally harmonized standards.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/12/01/2011-30945/damage-tolerance-and-fatigue-evaluation-of-composite-rotorcraft-structures)
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