An applicant for the validation of an approach control (surveillance) rating shall, under the supervision of an air traffic service instructor (operational), have provided approach control (surveillance) services, in conjunction with the approach control services referred to in subpart 9, at the ATSU for which the rating validation is sought for at least 50 hours, 50 percent of which may be provided on a simulator which accurately simulates the environment pertaining to the position for which the validation is sought.