# Airworthiness Directives; Viking Air Limited Model DHC-7 Airplanes
> **Rule** · Final rule. · Published 2006-05-23 · Effective 2006-06-27 · 71 FR 29583
## Document
- **Document number:** 06-4677
- **Category:** airworthiness
- **Manufacturer:** Viking Air Limited Model DHC-7
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 29583
- **Publication date:** 2006-05-23
- **Effective date:** 2006-06-27
- **FAA docket:** Docket No. FAA-2005-22146
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Viking Air Limited Model DHC-7 airplanes. This AD requires implementing a corrosion prevention and control program (CPCP) either by accomplishing specific tasks or by revising the maintenance inspection program to include a CPCP. This AD results from a determination that, as airplanes age, they are more likely to exhibit indications of corrosion. We are issuing this AD to prevent structural failure of the airplane due to corrosion.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/05/23/06-4677/airworthiness-directives-viking-air-limited-model-dhc-7-airplanes)
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