# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2020-12-23 · Effective 2021-01-27 · 85 FR 83753
## Document
- **Document number:** 2020-28270
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 83753
- **Publication date:** 2020-12-23
- **Effective date:** 2021-01-27
- **FAA docket:** Docket No. FAA-2020-0844
## 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 a report of cracks found in fastener holes at a certain station of the center wing box. This AD requires repetitive external surface high frequency eddy current (HFEC) inspections and repetitive external surface ultrasonic inspections; or repetitive internal detailed inspections; of a certain station of the center wing box for any cracking, and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/12/23/2020-28270/airworthiness-directives-the-boeing-company-airplanes)
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