# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-03-24 · Effective 2021-04-28 · 86 FR 15572
## Document
- **Document number:** 2021-06023
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 15572
- **Publication date:** 2021-03-24
- **Effective date:** 2021-04-28
- **FAA docket:** Docket No. FAA-2020-0785
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747 series airplanes and Model 767 series airplanes. This AD was prompted by a report of an un-commanded fuel transfer between the main and center fuel tanks. This AD prohibits operation of an airplane with any inoperative refuel valve (fueling shut-off valve) failed in the open position. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/24/2021-06023/airworthiness-directives-the-boeing-company-airplanes)
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