A vacancy may be advertised and applicants certified before the vacancy occurs, but no appointment may become effective more than three pay. This step takes 10 business days to complete.Mandatory Requirements for filling the Casual Vacancy in the Office of Director. Welcome to Fairfax County's job application process! A specimen resolution (board or member) to appoint a director to fill a casual vacancy. Check out the application process. Non-Principal School-Based Administrative Positions. Members can serve up to three consecutive terms, possibly longer if appointed to complete an incomplete term. " Melissa Womble, PhD. No trade-in required.