42ZTWhen grant or approval is effective

#### 42ZT When grant or approval is effective (1) If CASA or an authorised person grants an exemption, or approves a variation, the grant or approval has effect from when notice of the grant or approval is given to the applicant. (2) The exemption or variation stops being in force if: (a) it is expressed to have effect for a limited period and that period ends; or (b) it is revoked by CASA by written notice given to the holder of the certificate of registration for the aircraft concerned; or (c) the holder of the certificate of registration for the aircraft concerned gives CASA or the authorised person written notice that the holder no longer wants the exemption or variation to apply in relation to the aircraft. (3) CASA must not revoke an exemption or a variation unless CASA thinks it is necessary to do so for the purpose of ensuring the safety of air navigation.