<p>The FAA proposes to supersede&nbsp;Airworthiness Directive 2021–23–13, which applies to all helicopters equipped with a radio altimeter, by prohibiting certain operations when in the presence of possible 5G C-band radio frequency interference in areas identified by notams. Since the issuance of AD 2021–23–13 in December 2021, the FAA has determined that additional limitations are needed. Whereas 5G C-Band transmissions were initially limited to 3.7 to 3.8 GHz, these transmissions have also begun to expand to 3.8 to 3.98 GHz, and the FAA expects deployment at the higher end of the frequency range to expand after July 1. This proposed AD would require revising the limitations section of the existing rotorcraft flight manual to prohibit certain operations requiring radio altimeter data due to the presence of 5G C-Band interference. Comments on this proposed AD are due by May 12, 2023.</p>


U.S.: Limits on Helo Radio Altimeters

2024 Corporate Aviation Leadership Summit

U.S.: Limits on Helo Radio Altimeters

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