# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule; request for comments. · Published 2019-06-10 · Effective 2019-06-10 · 84 FR 26743
## Document
- **Document number:** 2019-12221
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 84 FR 26743
- **Publication date:** 2019-06-10
- **Effective date:** 2019-06-10
- **FAA docket:** Docket No. FAA-2019-0409
## Abstract

The FAA is adopting an airworthiness directive (AD) for certain The Boeing Company Model 737-700C, -800, and -900ER series airplanes. This AD requires a maintenance records check to determine if any main slat track assembly has been removed, an inspection of the main slat track assemblies for a suspect lot number or a lot number that cannot be determined, and applicable on-condition actions. This AD was prompted by a report that certain main slat track assemblies were manufactured incorrectly and are affected by hydrogen embrittlement. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/06/10/2019-12221/airworthiness-directives-the-boeing-company-airplanes)
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