The Federal Aviation Administration (FAA) issued an Airworthiness Directive (AD) prohibiting Boeing 747-8, 747-8F and 777 airplanes from landing at airports where 5G interference could occur.
The AD does not apply to landings at airports where the FAA determined the aircraft altimeters are safe and reliable in the 5G C-band environment. It also does not apply to airports where 5G isn’t deployed.
The FAA issued the AD because many systems on Boeing 747-8, 747-8F and 777 aircraft rely on the altimeter, including autothrottle, ground proximity warning, thrust reversers and Traffic Collision Avoidance System.
The AD affects approximately 336 airplanes in the United States and 1,714 worldwide.
Compliance time is within two days of the effective date of the AD.
