Embraer EMB-135, EMB-145, ERJ 170 and ERJ 190 aeroplanes - Radio Altimeters - 5G Interference Susceptibility
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Embraer EMB-135, EMB-145, ERJ 170, and ERJ 190 aeroplanes equipped with the specified Honeywell radio altimeters should review and follow the instructions in the referenced Embraer Service Bulletins to install the recommended filters. Although the bulletin is informational and not mandatory, implementing these modifications is advised to reduce 5G interference risks. No explicit compliance deadline is provided.
Summary
EASA Safety Information Bulletin 2026-03 is an airworthiness bulletin addressing the susceptibility of radio altimeters on Embraer EMB-135, EMB-145, ERJ 170, and ERJ 190 aeroplanes to interference from 5G signals. It specifically concerns Honeywell KRA-405B and RT-300 radio altimeters installed on these aircraft models. The bulletin provides information and recommendations to mitigate potential interference issues related to 5G transmissions in the 3.4-4.4 GHz frequency range.
What changed
This new bulletin introduces awareness of increased occurrences of erroneous radio altimeter indications on the affected Embraer aircraft, linked to potential 5G interference. It recommends the installation of specific filters as detailed in various Embraer Service Bulletins to reduce susceptibility to 5G ground network interference. The bulletin does not mandate actions but encourages operators to implement these mitigations.
Why it matters
For aviation professionals, this bulletin highlights a potential safety concern affecting radio altimeter reliability due to 5G signals, which are critical for safe aircraft operations. Operators and maintenance organizations need to be aware of the susceptibility of certain Honeywell radio altimeters to interference and consider the recommended filter installations to maintain operational safety and compliance. This proactive approach helps prevent possible erroneous altitude readings that could impact flight safety.
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