Airworthiness Directives; The Boeing Company Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register April 22, 2026. Document 2026-07808. Updated Nov. 12, 2026.

What it does

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.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 485 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

748 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

April 21, 2026 Final rule. Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
April 21, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Various Helicopters
April 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
April 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
April 14, 2026 Final rule. Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
April 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters
April 14, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
April 14, 2026 Final rule. Airworthiness Directives; Airbus Helicopters

Since then:

What happens next and when

This AD is effective May 7, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-07808
Action	Final rule; request for comments.
Agencies	Transportation Department; Federal Aviation Administration
Published	April 22, 2026
Effective date	May 7, 2026
Comments close	June 8, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-3486

Source: the Federal Register (public domain). The document in the Federal Register