Every article on this site is written by AI from official sources and checked by a second AI. How it works
Final ruleTook effect July 1, 2026

Airworthiness Directives; Transport and Commuter Category Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register June 30, 2026. Document 2026-13162. Updated Nov. 9, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all transport and commuter category airplanes equipped with a radio (also known as radar) altimeter. This AD was prompted by the determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G Lower C-Band) while operating in Canadian airspace. This AD requires revising the existing airplane flight manual (AFM) to incorporate limitations prohibiting certain operations requiring radio altimeter data when operating within the Canadian airspace. 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 482 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

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

Since then:

What happens next and when

This AD is effective July 1, 2026.

The agency's dates, word for word.

Document number2026-13162
ActionFinal rule; request for comments.
AgenciesTransportation Department; Federal Aviation Administration
PublishedJune 30, 2026
Effective dateJuly 1, 2026
Comments closeAug. 14, 2026
Regulation identifier (RIN)2120-AA64
DocketFAA-2026-4659

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