Avionics
Proposed AD Expands Limits on Helo Radio Altimeters
The FAA is proposing stricter limits on helicopters with a radio altimeter operating in the presence of possible 5G C-band radio frequency interference.
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The FAA proposes to supersede Airworthiness Directive (AD) 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. 

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