# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2022-01-18 · Effective 2022-02-22 · 87 FR 2532
## Document
- **Document number:** 2022-00585
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 2532
- **Publication date:** 2022-01-18
- **Effective date:** 2022-02-22
- **FAA docket:** Docket No. FAA-2021-0794
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400, -400D, and -400F series airplanes. This AD was prompted by reports of burned Boeing Material Specification (BMS) 8-39 urethane foam, and a report from the airplane manufacturer that airplanes were assembled with seals throughout various areas of the airplane (including flight deck and cargo compartments) made of BMS 8-39 urethane foam, a material with fire- retardant properties that deteriorate with age. This AD requires replacing the system tube/wire seals made of BMS 8-39 urethane foam in certain areas of the airplane. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/01/18/2022-00585/airworthiness-directives-the-boeing-company-airplanes)
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