# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-08-14 · Effective 2012-09-18 · 77 FR 48423
## Document
- **Document number:** 2012-19423
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 48423
- **Publication date:** 2012-08-14
- **Effective date:** 2012-09-18
- **FAA docket:** Docket No. FAA-2012-0336
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-500 series airplanes. This AD was prompted by reports of chem-mill step cracking on the aft lower lobe fuselage skins. This AD requires inspections of the fuselage skin at the chem- mill steps, and repair if necessary. We are issuing this AD to detect and correct cracking on the aft lower lobe fuselage skins, which could result in decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/08/14/2012-19423/airworthiness-directives-the-boeing-company-airplanes)
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