; (2) a review of the assumptions and methods used in devising and implementing the staffing model to assess the adequacy of the staffing model to predict the number of aviation safety inspectors needed to properly fulfill the mission of the Federal Aviation Administration and meet the future growth of the aviation industry; and (3) a determination on whether the current staffing model takes into account the Federal Aviation Administration's authority to fully utilize designees. (c) Report Not later than 30 days after the date of completion of the audit, the Inspector General shall submit to the appropriate committees of Congress a report on the results of the audit. 2503. Approach control radar The Administrator of the Federal Aviation Administration shall— (1) identify airports that are currently served by Federal Aviation Administration towers with nonradar approach and departure control (type 4 tower)