Section 145.155 - Inspection personnel requirements(a) A certificated repair station must ensure that persons performing inspections under the repair station certificate and operations specifications are-(1) Thoroughly familiar with the applicable regulations in this chapter and with the inspection methods, techniques, practices, aids, equipment, and tools used to determine the airworthiness of the article on which maintenance, preventive maintenance, or alterations are being performed; and(2) Proficient in using the various types of inspection equipment and visual inspection aids appropriate for the article being inspected.(b) A certificated repair station must ensure its inspectors understand, read, and write English.Doc. No. FAA-1999-5836, 66 FR 41117 , Aug. 6, 2001, as amended by Amdt. 145-30, 79 FR 46985 , Aug. 12, 2014