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 March 12, 2026. Document 2026-04832. Updated Nov. 13, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This AD was prompted by a report of multiple instances of loss of transponder for airplanes entering airspace in the presence of continuous wave (CW) interference where the transponder did not meet the minimum operational performance standards (MOPS) requirement for transponder response. This AD requires replacing the left and right integrated surveillance system processor unit (ISSPU) hardware. 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 488 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

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

March 12, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
March 12, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
March 12, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
March 10, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
March 10, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
March 10, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
March 10, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters
March 9, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters

Since then:

What happens next and when

This AD is effective April 16, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-04832
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	March 12, 2026
Effective date	April 16, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-0924

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