Superseded. This AD was superseded by AD 2023-11-07. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2021-23-13
Effective 12/09/2021 · Published 12/09/2021
Airworthiness Directives; Various Helicopters
Summary
The FAA is adopting a new airworthiness directive (AD) for all helicopters equipped with a radio (also known as radar) altimeter. 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). This AD requires revising the limitations section of th…