42NWhen approval is effective

#### 42N When approval is effective (1) If CASA or an authorised person approves a system of maintenance, the approval has effect from when notice of the approval is given to the holder of the certificate of registration for the aircraft concerned. (2) An approval of a system of maintenance approved because of a request under regulation 42J stops being in force if: (a) CASA revokes the approval by written notice given to the holder of the certificate of registration for the aircraft concerned; or (b) the holder of the certificate of registration for the aircraft concerned gives CASA or an authorised person written notice that the holder no longer wants the approved system to apply to the aircraft. (3) An approval of a system of maintenance submitted because of a direction of a kind referred to in regulation 42K stops being in force if CASA revokes the approval by written notice given to the holder of the certificate of registration for the aircraft concerned. (4) CASA must not revoke an approval of a system of maintenance unless CASA thinks it is necessary to do so for the purpose of ensuring the safety of air navigation.