in air traffic controller instruction and training. (3) Recommendations on how and where to utilize retired CPCs. (4) The effect on the ability of active CPCs to carry out on-the-job duties, other than instruction, and any related efficiencies if additional retired CPCs were involved as instructors. (5) The known vulnerabilities, as categorized by FAA Air Traffic Organization regions, in cases in which the FAA requires CPCs to provide instruction and training to CPCs in training 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 under subsection (a), the Administrator shall brief the appropriate committees of Congress on the results of the study and any actions that may be taken by the Administrator based on such results. 417. 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 Act, 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, the Administrator shall: (1) 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 training and hiring process. (2) Assess the assumptions and methodologies used to develop the AT–SA, the job-relevant aptitudes measured, and the scoring process for the assessment. (3) Assess whether any other revisions to the AT–SA are necessary to enhance the air traffic control specialist workforce training and hiring process. (b) DOT inspector general report Not later than 180 days after