# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-06-24 · Effective 2021-07-29 · 86 FR 33101
## Document
- **Document number:** 2021-13122
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 33101
- **Publication date:** 2021-06-24
- **Effective date:** 2021-07-29
- **FAA docket:** Docket No. FAA-2021-0026
## 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 indicating that a crack was found on the splice angle flange that is attached to the station (STA) 540 bulkhead in the area between certain stringers. This AD requires repetitive surface high frequency eddy current (HFEC) inspections at the radius of the left- and right-side of the STA 540 bulkhead splice angle for any cracking, 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/2021/06/24/2021-13122/airworthiness-directives-the-boeing-company-airplanes)
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