# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2017-02-21 · Effective 2017-03-28 · 82 FR 11132
## Document
- **Document number:** 2017-01825
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 11132
- **Publication date:** 2017-02-21
- **Effective date:** 2017-03-28
- **FAA docket:** Docket No. FAA-2016-6426
## Abstract

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-300, -400, and -500 series airplanes. This AD was prompted by reports of intergranular cracks on the front spar chord lugs of the outboard horizontal stabilizer. This AD requires repetitive inspections of the front spar chord lugs and lug bores of the horizontal stabilizer, 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/2017/02/21/2017-01825/airworthiness-directives-the-boeing-company-airplanes)
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