4.1 The Administration shall issue, or cause to
be issued, detailed instructions to the RO which shall ensure that
the CAS surveys are carried out in accordance with the provisions
of sections 5 through 10 of this Scheme.
4.2 Nothing in this Scheme shall prevent an Administration
from carrying out the CAS surveys itself, provided that such surveys
are at least as effective as those prescribed in sections 5 through
10 in this Scheme.
4.3 The Administration shall require Category
2 and Category 3 oil tankers flying its flag which are subject to
the provisions of regulation 20.7 to
remain out of service during the periods referred to in paragraph
5.1.2, until these oil tankers are issued with a valid Statement of
Compliance.