# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-07-30 · Effective 2021-09-03 · 86 FR 40927
## Document
- **Document number:** 2021-16174
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 40927
- **Publication date:** 2021-07-30
- **Effective date:** 2021-09-03
- **FAA docket:** Docket No. FAA-2020-0333
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes powered by LEAP-1B engines. This AD was prompted by reports of inadvertent release of the spring energy of the spring door opening system (SDOS) actuator with a certain part number, causing injury and the potential for injury to maintenance personnel. This AD requires replacing each affected SDOS actuator with a new SDOS actuator, and verifying that new safety markers are installed in the proper locations. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/30/2021-16174/airworthiness-directives-the-boeing-company-airplanes)
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