; and (2) whether a certificate under section 44703 or section 44704 of this title, or a certificate of waiver or certificate of authorization, is required for the operation of unmanned aircraft systems identified under paragraph (1) of this subsection. (c) Requirements for safe operation If the Secretary determines under this section that certain unmanned aircraft systems may operate safely in the national airspace system, the Secretary shall establish requirements for the safe operation of such aircraft systems in the national airspace system, including operation related to research, development, and testing of proprietary systems. (d) Pilot certification exemption If the Secretary proposes, under this section, to require an operator of an unmanned aircraft system to hold an airman certificate, a medical certificate, or to have a minimum number of hours operating a manned aircraft, the Secretary shall set forth the reasoning for such proposal and seek public notice and comment before imposing any such requirements. (e) Sunset The authority under this section for the Secretary to determine if certain unmanned aircraft systems may operate safely in the national airspace system terminates effective September 30, 2021. . (b) Technical and conforming amendments (1) Table of contents The table of contents for chapter 448, as amended by section 2124 of this Act, is further amended by inserting after the item relating to section 44804 the following: 44805. Special authority for certain unmanned aircraft systems. . (2) Special rules for certain unmanned aircraft systems Section 333 of the FAA Modernization and Reform Act of 2012 ( 49 U.S.C. 40101 note) and the item relating to that section in the table of contents under section 1(b) of that Act (126 Stat. 13) are repealed. 2126. Additional rulemaking authority (a) Sense of Congress It is the sense of Congress that— (1) beyond visual line of sight operations, nighttime operations, and operations over people of unmanned aircraft systems have tremendous potential— (A) to