# Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2008-10-01 · Effective 2008-10-16 · 73 FR 56958
## Document
- **Document number:** E8-22755
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 73 FR 56958
- **Publication date:** 2008-10-01
- **Effective date:** 2008-10-16
- **FAA docket:** Docket No. FAA-2008-0947
## Abstract

We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, and -500 series airplanes. This AD requires repetitive external detailed inspections or non-destructive inspections to detect cracks in the fuselage skin along the chem-mill steps at stringers S-1 and S-2R, between station (STA) 400 and STA 460, and repair if necessary. This AD results from reports of cracks in the fuselage skin common to stringer S-1 and between STA 400 and STA 460. We are issuing this AD to detect and correct fatigue cracking of the fuselage skin panels at the chem-mill steps, which could result in sudden fracture and failure of the fuselage skin panels, and consequent rapid decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/10/01/E8-22755/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes)
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