# Airworthiness Directives; Boeing Model 747-200C, -200F, -400, -400D, and -400F Series Airplanes
> **Rule** · Final rule. · Published 2006-03-09 · Effective 2006-04-13 · 71 FR 12122
## Document
- **Document number:** 06-2142
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 12122
- **Publication date:** 2006-03-09
- **Effective date:** 2006-04-13
- **FAA docket:** Docket No. FAA-2005-23196
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-200C, -200F, -400, -400D, and -400F series airplanes. This AD requires repetitive inspections for cracks in the overlapping (upper) skin, upper fastener row of the lap joints of the fuselage skin in sections 41, 42, and 46; and related investigative and corrective actions, if necessary. This AD results from fatigue tests and an analysis that identified areas of the fuselage lap joints where fatigue cracks can occur. We are issuing this AD to detect and correct fatigue cracks in the overlapping (upper) skin, upper fastener row of the lap joints of the fuselage skin in sections 41, 42, and 46, which could adversely affect the structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/03/09/06-2142/airworthiness-directives-boeing-model-747-200c--200f--400--400d-and--400f-series-airplanes)
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