If:

(a) a ship security plan for a regulated Australian ship is in force; and
(b) the Secretary is no longer satisfied that the plan adequately addresses the relevant requirements under Division 4; and
(c) the Secretary is satisfied that it is not appropriate to direct the ship operator for the ship to:
(i) vary the plan under section 72; or
(ii) revise the plan under section 74;

the Secretary must, by written notice given to the ship operator, cancel the approval of the plan.