# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-06-15 · Effective 2021-07-20 · 86 FR 31604
## Document
- **Document number:** 2021-12436
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 31604
- **Publication date:** 2021-06-15
- **Effective date:** 2021-07-20
- **FAA docket:** Docket No. FAA-2020-0341
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by significant changes made to the airworthiness limitations (AWLs) related to fuel tank ignition prevention and the nitrogen generation system (NGS). This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate the April 2019 or November 2020 revision of the airworthiness limitations document. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/06/15/2021-12436/airworthiness-directives-the-boeing-company-airplanes)
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