# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-04-23 · Effective 2021-05-28 · 86 FR 21635
## Document
- **Document number:** 2021-08508
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 21635
- **Publication date:** 2021-04-23
- **Effective date:** 2021-05-28
- **FAA docket:** Docket No. FAA-2020-0587
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This AD was prompted by crack indications found in the lower aft wing skin bolt holes where the flap tracks attach to the track support fitting. This AD requires repetitive inspections for cracking of the left and right wing, lower aft wing skin aft edge, at certain flap track locations, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/04/23/2021-08508/airworthiness-directives-the-boeing-company-airplanes)
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