# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2018-03-19 · Effective 2018-04-23 · 83 FR 11871
## Document
- **Document number:** 2018-05016
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 11871
- **Publication date:** 2018-03-19
- **Effective date:** 2018-04-23
- **FAA docket:** Docket No. FAA-2017-0903
## Abstract

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-300 and -500 series airplanes. This AD was prompted by a report indicating that fatigue cracks were found in the lower wing skin of an airplane with winglets installed. This AD requires repetitive inspections for cracking of the lower wing skin, and repair if necessary. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/03/19/2018-05016/airworthiness-directives-the-boeing-company-airplanes)
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