# Airworthiness Directives; Boeing Model 747 Airplanes
> **Rule** · Final rule. · Published 2009-09-22 · Effective 2009-10-27 · 74 FR 48138
## Document
- **Document number:** E9-21922
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 48138
- **Publication date:** 2009-09-22
- **Effective date:** 2009-10-27
- **FAA docket:** Docket No. FAA-2009-0136
## Abstract

We are adopting a new airworthiness directive (AD) for certain Boeing Model 747 airplanes. This AD requires repetitive inspections for cracking of the fuselage frames in section 41, and corrective actions if necessary. This AD results from reports of cracking in fuselage frames made of 2024 aluminum alloy that were installed during previous modification of the frames in section 41 and during production. We are issuing this AD to detect and correct frame cracks, which could result in cracking of the adjacent fuselage skin and consequent rapid decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/09/22/E9-21922/airworthiness-directives-boeing-model-747-airplanes)
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