13.—(1) A duty holder shall thoroughly review a current safety case when directed to do so by the Executive.
(2) In the absence of a direction under paragraph (1), a duty holder shall thoroughly review a current safety case within 5 years of—
(a)the date on which the Executive accepted that current safety case; and
(b)the date of the previous review.
(3) A duty holder shall send a summary of each such review to the Executive—
(a)where the review is conducted at the direction of the Executive, within such reasonable time, being a period of not less than 28 days of the direction, as may be specified by the Executive; or
(b)in all other cases, within 28 days of its conclusion.