CASA has discretion:
39.004 ... (2) For paragraph 98(5A)(b) of the Act, CASA may, in writing, on its own initiative or on a written request by a person:
(a) approve, for a particular aircraft or aeronautical product, a means of compliance with an airworthiness directive other than that set out in the airworthiness directive; or
(b) subject to subregulation (5)—exclude a particular aircraft or aeronautical product from the operation of an airworthiness directive.