# Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747SR, and 747SP Series Airplanes
> **Rule** · Final rule. · Published 2010-07-13 · Effective 2010-08-17 · 75 FR 39818
## Document
- **Document number:** 2010-16435
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 39818
- **Publication date:** 2010-07-13
- **Effective date:** 2010-08-17
- **FAA docket:** Docket No. FAA-2010-0383
## Abstract

We are adopting a new airworthiness directive (AD) for certain Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747SR, and 747SP series airplanes. This AD requires repetitive detailed inspections of certain overwing intercostal webs, and related investigative and corrective actions if necessary. This AD results from reports of cracks in overwing intercostal webs. We are issuing this AD to detect and correct such cracking, which could grow and result in a severed intercostal. If an intercostal is severed, cracks could develop in the adjacent frame structure and skin, resulting in a rapid loss of cabin pressure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/07/13/2010-16435/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c)
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