By David Shepardson

WASHINGTON (Reuters) -The U.S. aviation industry said on Monday new precautionary measures offered by AT&T (NYSE:) and Verizon Communications (NYSE:) did not address the air safety concerns posed by 5G wireless’s planned use of spectrum from C-Band.

Aerospace Industries Association wrote to Jessica Rosenworcel, chair of Federal Communications Commission. They stated that telecom plans are “inadequate and too narrow” to protect the safety and economic viability of the aviation industry.

Industry and Federal Aviation Administration (FAA), have voiced concerns regarding interference 5G could cause with delicate aircraft electronics, such as radio altimeters.

Verizon, the FAA and FCC did not comment immediately. AT&T declined comment.

Friday saw major airline and aircraft manufacturer coalitions meet with the White House and other agencies to present a proposal for enhanced safeguards to the National Economic Council.

According to the letter, the aviation proposal provides “extra safeguards in, around and on the approach of airports and helicopter ports.”

Expect the FAA to publish two Airworthiness Directives on Tuesday that highlight safety problems associated with 5G interference.

Final instructions to airlines about potential impacts and ways to comply are not expected until later when the FAA issues notices that will take into account AT&T and Verizon mitigation efforts.

AT&T and Verizon said on Nov. 24 they had committed for six months to take “additional steps to minimize energy coming from 5G base stations – both nationwide and to an even greater degree around public airports and heliports.”

AT&T and Verizon in November agreed to delay commercial launch of C-band wireless service until Jan. 5 after the FAA issued a Nov. 2 bulletin warning action may be needed to address the potential interference.

Wireless organizations argue that C-Band safety has not been a concern in any other country using the spectrum.