# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-12-28 · Effective 2022-02-01 · 86 FR 73660
## Document
- **Document number:** 2021-28133
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 73660
- **Publication date:** 2021-12-28
- **Effective date:** 2022-02-01
- **FAA docket:** Docket No. FAA-2021-0134
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by significant changes, including new or more restrictive requirements, made to the airworthiness limitations (AWLs) and Critical Design Configuration Control Limitations (CDCCLs) related to fuel tank ignition prevention, the engine fuel suction feed system, and the nitrogen generation system. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/28/2021-28133/airworthiness-directives-the-boeing-company-airplanes)
---
*AI Analytics · CC0 1.0*