; and (C) running scenarios for each ATCT involving varying complexities of air traffic (including, but not limited to, aircraft emergencies, rapidly changing weather, issuance of safety alerts, and recovering from unforeseen events or losses of separation). (3) Mobile TSS Not later than 4 years after the date of enactment of this section, the Administrator shall acquire and implement mobile TSS at each ATCT that is without an existing, permanent TSS so that the mobile TSS is capable of, at a minimum, the functions described in subparagraphs (A), (B), and (C) of paragraph (2). (b) Collaboration In carrying out the activities under subsection (a), the Administrator may collaborate with the exclusive bargaining representative of air traffic controllers certified under section 7111 of title 5, United States Code. 530. Air Traffic Controller Instructor Pipeline (a) In general No later than 270 days after the date of enactment of this section, the Administrator shall initiate a study examining the pipeline of air traffic controller instructors and the projected number of instructors needed to maintain the safety of the national airspace system over the 5-fiscal year period beginning with fiscal year 2024. (b) Contents The study required by subsection (a) shall include the following: (1) An examination of projected instructor staffing targets, including the number of on-the-job instructors needed for the instruction and training of Certified Professional Controllers in Training (CPC-Its). (2) Whether involving further retired Certified Professional Controllers (CPCs) as instructors, including for classroom training, would produce improvements in air traffic controller instruction and training. (3) Recommendations on how and where to utilize retired certified professional controllers. (4) The effect on the ability of active Certified Professional Controllers (CPCs) to carry out on-the-job duties, other than instruction, and any related efficiencies if more retired Certified Professional Controllers (CPCs) were