The release of the Federal Aviation Administration (FAA) Airworthiness Directive (AD) 2021-23-13 and the Transport Canada Civil Aviation (TCCA) AD CF-2021-53, identifying potential operational risks of certain 5G C-Band wireless frequencies (3.7 to 3.98 GHz) being deployed and the effect on installed radio altimeters have raised some concern from our Bell owners/operators.

Prior to the release of the ADs, the FAA had released the Special Airworthiness Information Bulletin (SAIB) AIR-21-18 and TCCA released the Civil Aviation Safety Alert (CASA) 2021-08 with additional information and operational recommendations.