A commercial aircraft approaches to land at San Diego International Airport as U.S. telecom companies, airlines and the FAA continue to discuss the potential impact of 5G wireless services on aircraft electronics in San Diego, California, U.S., January 6, 2022. REUTERS/Mike Blake

The Federal Aviation Administration (FAA) began publishing notices early on Thursday that detailed the extent of potential impact of new 5G wireless service on sensitive aircraft electronics.

The FAA has been in talks with airplane makers, airlines and wireless carriers to reduce the impact of new wireless service set to begin on Jan. 19.

The FAA has warned that potential interference could affect sensitive airplane instruments like altimeters but on Wednesday reported progress.

AT&T and Verizon Communications (VZ.N), which won nearly all of the C-Band spectrum in an $80-billion auction last year, on Jan. 3 agreed to buffer zones around 50 airports to reduce the risk of interference.

They also agreed to delay deployment for two weeks, averting an aviation safety standoff.

The FAA began publishing what are known as ‘Notices to Air Missions’ at midnight Thursday local time offering details on “aircraft with untested altimeters or that need retrofitting or replacement will be unable to perform low-visibility landings where 5G is deployed.”