5 U.S.C. § 3404
Personnel ceilings
In administering any personnel ceiling applicable to an agency (or unit therein), an employee employed by such agency on a part-time career employment basis shall be counted as a fraction which is determined by dividing 40 hours into the average number of hours of such employee’s regularly scheduled workweek. This section shall become effective on October 1, 1980 .
(Added Pub. L. 95–437, § 3(a) , Oct. 10, 1978 , 92 Stat. 1057 , § 3394; renumbered § 3404, Pub. L. 95–454, title IX, § 906(c)(1)(B) , Oct. 13, 1978 , 92 Stat. 1226 .)