US Secretary of Transportation, Pete Buttigieg, has warned that the increased performance of 5G networks by US mobile operators could cause disruptions and problems at airports. The issue primarily affects airlines that have not equipped their aircraft with the necessary technology to mitigate the interference caused by the closely related frequencies of the US 5G standard and the altimeters used in aircraft. Landing clearance may not be granted in certain weather conditions and poor visibility unless these changes are made. The extent of possible problems depends on the weather and is difficult to predict, but delays or cancellations are likely. Airlines are urged to make the necessary adjustments promptly or adjust their flight schedules accordingly.
This problem has been identified since the beginning of last year when the US government requested a maximum delay of two weeks in the introduction of the 5G standard at airports. The replacement of adapted technology, which the US has been requesting, has been stalled due to supply chain problems. Some airlines have already fully converted their fleets, but others have been able to do so only in part. The International Air Transport Association (IATA) states that not all airlines can meet the July 1 deadline due to the lack of available technology.
The required replacement of altimeters is relatively simple but time-consuming and complicated to overhaul an active fleet. The costs for the airlines to bear amount to almost $638 million. Some airlines expect the conversions to last until October. However, United Airlines and Southwest Airlines have stated that their aircraft are ready and that their currently installed altimeters can be operated without restrictions. American Airlines also plans to complete the upgrades as scheduled by the deadline.
