(1) A balloon flight crew rating remains in force from the day on which it is issued, or renewed, until:
(a) the end of the period set out in the Civil Aviation Orders as the period for which a rating of that kind remains in force; or
(b) the end of the period set out by CASA in the holder of the rating's personal log book as the period for which the rating remains in force; or
(c) it is suspended or cancelled;
(2) If a balloon flight crew rating is entered by CASA in a personal log book, CASA may set out in the log book the period for which the rating remains in force.
(3) CASA may give directions in Civil Aviation Orders setting
out the period for which a balloon flight crew rating remains in force.