(9) Every tanker referred to in paragraph (1), constructed before 25th May 1980—
(a)for which the building contract was placed after 1st June 1979; or
(b)in the absence of a building contract, constructed after 1st January 1980; or
(c)which was delivered after 1st June 1982; or
(d)which undergoes an alteration or modification of a major character—
(i)for which a contract was placed after 1st June 1979; or
(ii)in the absence of a contract, the construction work of which was begun after 1st January 1980; or
(iii)which was completed after 1st June 1982;
shall be fitted with a fixed deck foam system complying with Schedule 7 in Merchant Shipping Notice MSN 1666.