FAA orders · airworthiness directive · historical

2021-23-12: Indicating/Recording System, Navigation

FAA order 2021-23-12 is an airworthiness directive in force since December 9, 2021. The FAA's subject line: Indicating/Recording System, Navigation. System: instruments and avionics.

What it applies to as the FAA lists it

Kind of product: Appliance
Makes: The Boeing Company; Airbus SAS; Bombardier Inc.; Embraer S.A.; Gulfstream Aerospace Corporation; Gulfstream Aerospace LP; Textron Aviation Inc.; Pilatus Aircraft Ltd.; Fokker Services B.V.; Saab AB Support and Services; De Havilland Aircraft of Canada Limited; Airbus Canada Limited Partnership; ATR - GIE Avions de Transport Régional; Yaborã Indústria Aeronáutica S.A.; MHI RJ Aviation ULC; BAE Systems (Operations) Limited; Lockheed Martin Corporation; Lockheed Martin Aeronautics Company; Viking Air Limited; Dassault Aviation
Models: N/A

Dates and paperwork

In force since: December 9, 2021
Published: December 9, 2021 (signed December 7, 2021)
Docket: FAA-2021-0953
Status: Historical
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

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 a 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 C-Band). This AD requires revising the limitations section of the existing airplane/ aircraft flight manual (AFM) to incorporate limitations prohibiting certain operations requiring radio altimeter data when in the presence of 5G C-Band interference as identified by Notices to Air Missions (NOTAMs). The FAA is issuing this AD to address the unsafe condition on these products.

The order itself the regulatory text, as published

Show the full text (3,668 characters)

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2021-23-12 Transport and Commuter Category Airplanes: Amendment 39-21810; Docket No. FAA-2021-0953; Project Identifier AD-2021-01169-T. (a) Effective Date This airworthiness directive (AD) is effective December 9, 2021. (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 (19) of this AD. (1) The Boeing Company (2) Airbus SAS (3) Bombardier Inc. (4) Embraer S.A. (5) Gulfstream Aerospace Corporation (6) Gulfstream Aerospace LP (7) Textron Aviation Inc. (8) Pilatus Aircraft Limited (9) Fokker Services B.V. (10) Saab AB, Support and Services (11) DeHavilland Aircraft of Canada Limited (12) Airbus Canada Limited Partnership (13) ATR-GIE Avions de Transport Régional (14) Yaborã Indústria Aeronáutica S.A. (15) MHI RJ Aviation ULC (16) BAE Systems (Operations) Limited (17) Lockheed Martin Corporation/Lockheed Martin Aeronautics Company (18) Viking Air Limited (19) Dassault Aviation (d) Subject Air Transport Association (ATA) of America Code 31, Indicating/Recording System; 34, Navigation. (e) Unsafe Condition This AD was prompted by a 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 C-Band). The FAA is issuing this AD because radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground ( e.g., landing flare), could lead to loss of continued safe flight and landing. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Airplane/Aircraft Flight Manual (AFM) Revision On or before January 4, 2022: Revise the Limitations Section of the existing AFM by incorporating the limitations specified in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of this AD into the existing AFM. ER09DE21.007 (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, Operational Safety Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the Operational Safety Branch, send it to the attention of the person identified in paragraph (i) of this AD. Information may be emailed to: [email protected]. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (i) Related Information For more information about this AD, contact Brett Portwood, Continued Operational Safety Technical Advisor, COS Program Management Section, Operational Safety Branch, FAA, 3960 Paramount Boulevard, Lakewood, CA 90712-4137; phone: 817-222-5390; email: [email protected]. (j) Material Incorporated by Reference None. Issued on December 7, 2021. Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2021-26777 Filed 12-7-21; 2:00 pm]BILLING CODE 4910-13-P

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/2021-23-12.json · aircraft systems.