Duration of certificate of compliance and certification plate
14. A certificate of compliance and a certification plate shall, unless previously cancelled or surrendered, be valid—
(a)if it is issued as a result of a test of the transport equipment to which it relates, for a period not exceeding six years from the date on which it is issued;
(b)if it is issued as a result of an examination of the transport equipment to which it relates, for a period not exceeding three years from the date on which it is issued;
(c)if it is issued on the basis of compliance with an approved type, for a period not exceeding six years from the date on which it is issued.