Commonwealth Consolidated Regulations Commonwealth Consolidated RegulationsFor paragraph 227(e) of the Act, each of the following is a circumstance in which the relevant Director may vary or revoke a determination made under subsection 223(1) of the Act in relation to a landing place, or vary the conditions specified in the determination:
(a) there has been a material change in the operations carried out at the landing place;
(b) there has been material change in the infrastructure or services available at the landing place;
(c) the operator of the landing place has requested the variation or revocation of the determination, or the variation of the conditions.