No employee shall receive a career ladder promotion unless his or her current rating of record under part 430 of this chapter is "Fully Successful" (level 3) or higher. In addition, no employee may receive a career ladder promotion who has a rating below "Fully Successful" on a critical element that is also critical to performance at the next higher grade of the career ladder. 5 C.F.R. §335.104 51 FR 8411, Mar. 11, 1986