# Airworthiness Directives; Aerospatiale Model ATR42-500 and ATR72-212A Series Airplanes
> **Rule** · Final rule. · Published 2004-06-17 · Effective 2004-07-22 · 69 FR 33834
## Document
- **Document number:** 04-13499
- **Category:** airworthiness
- **Manufacturer:** Aerospatiale Model ATR42-500 and ATR72-212A Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 33834
- **Publication date:** 2004-06-17
- **Effective date:** 2004-07-22
- **FAA docket:** Docket No. 2002-NM-301-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR42-500 and ATR72-212A series airplanes, that requires repetitive inspections for cracking of the upper closing rib of the vertical fin, related investigative actions, and corrective actions if necessary. This action is necessary to prevent interference between the upper closing rib and the rudder, which could result in a rudder jam and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/06/17/04-13499/airworthiness-directives-aerospatiale-model-atr42-500-and-atr72-212a-series-airplanes)
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