# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule; request for comments. · Published 2026-04-22 · Effective 2026-05-07 · 91 FR 21373
## Document
- **Document number:** 2026-07808
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 91 FR 21373
- **Publication date:** 2026-04-22
- **Effective date:** 2026-05-07
- **FAA docket:** Docket No. FAA-2026-3486
## Abstract

The FAA is adopting a new airworthiness directive (AD) for The Boeing Company Model 747-400 series airplanes modified by certain supplemental type certificates (STCs). This AD was prompted by a report of a ruptured crew oxygen bottle flexible hose and arcing damage on an adjacent cargo loading system wiring harness. This AD requires a detailed inspection of the crew oxygen bottle flexible hoses and adjacent wire harnesses for chafing and arcing damage and for a minimum clearance between the crew oxygen bottle flexible hoses and adjacent wiring harnesses, and applicable repairs. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/04/22/2026-07808/airworthiness-directives-the-boeing-company-airplanes)
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