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Federal Register · Regulatory notice

Airworthiness Directives; Transport and Commuter Category Airplanes

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.

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Became public
Jun 30, 2026
Event / period date
Jul 1, 2026
Collected
Nov 8, 2026, 7:48 PM EST

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The source explicitly mentions LOCKHEED MARTIN CORP. A mention alone does not establish a financial benefit.

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 Aviation safety, Incorporation by reference, Safety. The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39--AIRWORTHINESS DIRECTIVES 0 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. Sec. 39.13 [Amended] 0 2. The FAA amends Sec. 39.13 by adding the following new airworthiness directive: 2026-13-02 Transport and Commuter Category Airplanes: Amendment 39- 23384; Docket No. FAA-2026-4659; Project Identifier MCAI-2025-00826- A,T. (a) Effective Date This airworthiness directive (AD) is effective July 1, 2026. (b) Affected ADs None. (c) Applicability This AD applies to all transport and commuter category airplanes equipped with a radio (also known as radar) altimeter. These radio altimeters are installed on various transport and commuter category airplanes including, but not limited to, the airplanes for which the design approval holder is identified in paragraphs (c)(1) through (18) of this AD. (1) Airbus Canada Limited Partnership (2) Airbus SAS (3) ATR-GIE Avions de Transport R[eacute]gional (4) BAE Systems (Operations) Limited (5) Bombardier Inc. (6) Dassault Aviation (7) De Havilland Aircraft of Canada Limited (8) Embraer S.A. (including type certificates previously held by Yabor[atilde] Ind[uacute]stria Aeron[aacute]utica S.A., which a

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