; (B) civil aircraft; or (C) aeronautical products and articles. (4) Cyber threat The term cyber threat means the threat of an action that, if carried out, would constitute a cyber incident or an electronic attack. (5) Electronic attack The term electronic attack means the use of electromagnetic spectrum energy to impede operations in the cyber environment, including through techniques such as jamming or spoofing. (6) Significant cyber incident The term significant cyber incident means a cyber incident, or a group of related cyber incidents, that the Administrator determines is likely to result in demonstrable harm to the national airspace system of the United States. . (b) Clerical amendment The analysis for chapter 401 of title 49, United States Code, is amended by adding at the end the following: 40131. National airspace system cyber threat management process. . 394. Securing aircraft avionics systems Section 506(a) of the FAA Reauthorization Act of 2018 ( 49 U.S.C. 44704 note) is amended— (1) in the matter preceding paragraph (1) by striking consider, where appropriate, revising and inserting revise, as appropriate, existing ; (2) in paragraph (1) by striking and at the end; (3) in paragraph (2) by striking the period at the end and inserting ; and