Airworthiness directives › 2021-23-12
AD 2021-23-12 Airworthiness Directives; Transport and Commuter Category Airplanes
Makes named: textron aviation, pilatus. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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
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.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1