"The FCC is making a regulatory change that would impose an extra cost on GA operators, without properly communicating with the industry or understanding the implications of its action," said AOPA Vice President of Regulatory Affairs Rob Hackman. "There is no FAA rrequirement to replace 121.5 MHz units with 406 MHz technology. When two government agencies don't coordinate, GA can suffer."The AEA said dealers should refrain from selling any new 121.5 MHz ELTs "until further understanding of this new prohibition can be understood and a realistic timeline for transition can be established."