The holder of a national pilot license issued in terms of this Part shall-
(a) not exercise the privileges of that license -
(i) unless that person -
(aa) holds an appropriate valid medical certificate or medical fitness certificate, as the case may be; and
(bb) complies with all medical endorsements on that medical certificate or medical fitness certificate;
(ii) while he or she is aware of having a medical deficiency that would make him or her unable to meet the medical standards for his or her medical certificate or medical fitness certificate, until he or she has been assessed medically fit again by an aviation medical examiner designated in terms of Part 67 (in the case of the holder of a medical certificate, referred to in sub-regulation (1)), or by a general medical practitioner (in the case of the holder of a medical fitness certificate, referred to in sub-regulation (2)).