Notwithstanding the provisions of sub- regulation (1), a certificate of airworthiness shall be rendered invalid if-
(a) the aircraft is removed from a South African aircraft register;
(b) the aircraft is not maintained in accordance with the regulations prescribed in Part 43;
(c) the certificate of release to service for such aircraft is invalidated by virtue of the provisions of regulation 43.04.3(3); and
(d) the aircraft does not comply with the design aspects of the appropriate airworthiness requirements prescribed in this Part.