Commonwealth Consolidated Regulations Commonwealth Consolidated Regulations(1) The person responsible for continuing airworthiness for an aircraft must ensure that the aircraft is not modified unless:
(a) there is a Part 21 approval for the design of the modification; and
(b) the modification is compatible with the configuration of the aircraft at the time the modification is made.
(2) The person responsible for continuing airworthiness for an aircraft contravenes subregulation (1) if:
(a) the aircraft is modified; and
(b) either:
(i) there is no Part 21 approval for the design of the modification; or
(ii) the modification is not compatible with the configuration of the aircraft at the time the modification is made.
(3) The person responsible for continuing airworthiness for an aircraft must ensure that a repair that involves a change to the approved design of the aircraft is not made unless:
(a) there is a Part 21 approval for the design of the change involved in the repair; and
(b) the repair is compatible with the configuration of the aircraft at the time the repair is made.
(4) The person responsible for continuing airworthiness for an aircraft contravenes subregulation (3) if:
(a) the aircraft is repaired; and
(b) the repair involves a change to the approved design for the aircraft; and
(c) either:
(i) there is no Part 21 approval for the change involved in the repair; or
(ii) the repair is not compatible with the configuration of the aircraft at the time the modification is made.
Note: Under regulation 42.110, failure to comply with this regulation is an offence.