Superseded. This AD was superseded by AD 2023-10-02. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2021-23-12
Effective 12/09/2021 · Published 12/09/2021
Airworthiness Directives; Transport and Commuter Category Airplanes
Summary
The FAA is adopting a new airworthiness directive (AD) for all transport and commuter category airplanes 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…