Navigation — Radio Altimeter System — Introduction of a Radio Frequency Filter to Decrease Risk of Interference from 5G C-Band Wireless Telecommunication Service on the Radio Altimeter System When Operating in the Contiguous United States of America Airspace
- Published
- Effective
- Deadline
- Replaces
- 2023-62
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected MHI RJ Aviation ULC aeroplanes must install the specified RF bandpass filters on radio altimeters within the stated compliance times: for CL-600-2B19 models within 2300 flight hours or 24 months from July 1, 2023; for CL-600-2C10, CL-600-2C11, CL-600-2D15, and CL-600-2D24 models within 2100 flight hours or 24 months from July 1, 2023; and for CL-600-2E25 models prior to the next flight in contiguous U.S. airspace. Dual radio altimeter configurations require filters on both units or deactivation of the second unit until filtered. Compliance must follow the instructions in the referenced service bulletins.
Summary
Airworthiness Directive CF-2023-62R1 titled 'Navigation — Radio Altimeter System — Introduction of a Radio Frequency Filter to Decrease Risk of Interference from 5G C-Band Wireless Telecommunication Service on the Radio Altimeter System When Operating in the Contiguous United States of America Airspace' addresses interference issues affecting MHI RJ Aviation ULC aeroplanes, specifically models CL-600-2B19, CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25 when operating in contiguous U.S. airspace. The directive mandates installation of a radio frequency bandpass filter on radio altimeters to mitigate 5G C-Band interference risks. This directive is issued by Transport Canada Civil Aviation to ensure continued safe flight and landing operations.
What changed
This revision CF-2023-62R1 clarifies that the requirements in Parts I and II of the directive apply only to aeroplanes operating within the contiguous United States airspace. It maintains the original requirement to install RF bandpass filters on radio altimeters to reduce interference from 5G C-Band wireless services. The directive supersedes the previous AD CF-2023-62 issued on 17 August 2023.
Why it matters
This directive is critical for aviation professionals because 5G C-Band interference can compromise radio altimeter performance, potentially delaying crew response and risking safe flight and landing. Operators, maintenance organizations, and compliance teams must ensure affected aircraft are modified to meet these requirements to avoid operational restrictions and maintain regulatory compliance. The directive aligns Canadian regulations with FAA mandates, ensuring harmonized safety standards in U.S. airspace.
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