FAA 2023-06-13

Requires revising the existing airplane flight manual with new limitations to mitigate identified hazards due to 5G C-Band interference. Prompted by the 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 to 3.98-GHz frequency band (5G C-Band), as well as a determination that this interference can result in unavailable or misleading radio altimeter information, adversely affecting the performance of the automatic flight control system and fly-by-wire systems and resulting in increased flightcrew workload during takeoff, approach, and landing below 400 feet agl.