TATs who agree to obtain a regular teaching certificate shall be eligible for an additional salary adjustment up to and including the third step of the appropriate lane provided, however, that they have not had such a salary lane adjustment at a previous time and that the provisions of Section 302.8 of the Chicago Public Schools Policy Manual (Compensation and Pay Plan) (Board Report: 08-0123-PO1) covering salary adjustment are met and an application (Salary Adjustment T. Per. 41) and, if outside time is involved, an affidavit (Affidavit Form T. Per. 42) is filed with the Talent Office. Any TAT who has had the above-mentioned salary adjustment and who fails to obtain a regular teaching certificate within one year shall revert to the appropriate step and lane, but no higher than step two. Whenever a TAT obtains a regular teaching certificate, said TAT shall not be subject to the salary step limitations outlined in this Section.