(a) Time period; limitationAny member of the Service receiving a salary under the Foreign Service Schedule shall be advanced to the next higher salary step in the member’s class at the beginning of the first applicable pay period following the completion by that member of a period of—
52 calendar weeks of service in each of salary steps 1 through 9, and
104 calendar weeks of service in each of salary steps 10 through 13,
unless the performance of the member during that period is found in a review by a selection board established under section 4002 of this title to fall below the standards of performance for his or her salary class.
(b) Additional increase for meritorious service