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 instructors. (5) The known vulnerabilities, as categorized by FAA Air Traffic Organization regions, where requiring Certified Professional Controllers (CPCs) to provide instruction and training to Certified Professional Controllers in Training (CPC-Its) is a significant burden on FAA air traffic controller staffing levels. (c) Deadline Not later than 2 years after the date on which the Administrator initiates the study required by subsection (a), the Administrator shall brief the appropriate committees of Congress on the results on the study and any actions that may be taken based on such results. 532. Ensuring hiring of air traffic control specialists is based on assessment of job-relevant aptitudes (a) Review of the air traffic skills assessment Not later than 180 days after the date of enactment of this section, the Administrator shall review and revise, if necessary, the Air Traffic Skills Assessment (in this section referred to as the AT–SA ) administered to air traffic controller applicants described in clauses (ii) and (iii) of section 44506(f)(1)(B) of title 49, United States Code, in accordance with the following requirements: (1) The Administrator shall evaluate all questions on the AT–SA and determine whether a peer-reviewed job analysis that ensures all questions test job-relevant aptitudes would result in improvements in the air traffic control specialist workforce pipeline. (2) The Administrator shall assess the assumptions and methodologies used to develop the AT–SA, the job-relevant aptitudes measured, and the scoring process for the assessment. (3) The Administrator shall assess whether any other revisions to the AT–SA are necessary to enhance the air traffic control specialist workforce pipeline. (b) DOT Inspector General report Not later than