Document ID: chunk:federal_register_of_legislation:F2024C01027:reg:15:p167
Version: federal_register_of_legislation:F2024C01027
Segment Type: reg
Provision Reference: reg 15 (pt 167/182)
Character Range: 580117–582993

Order 20.11 and Civil Aviation Order 20.18.
Note 2: See also Division 42.D.6 for other requirements relating to defects.
Note 3: Under regulation 42.110, failure to comply with this regulation is an offence.

42.120  Compliance with airworthiness directives—all aircraft
  If:
 (a) an airworthiness directive applies to:
 (i) an aircraft; or
 (ii) an aeronautical product that is part of, or used in, an aircraft; and
 (b) the aircraft or aeronautical product is not excluded from the operation of the airworthiness directive under subregulation 39.002(2) or paragraph 39.004(2)(b) or(3)(b);
the person responsible for continuing airworthiness for the aircraft must ensure that the requirements mentioned in paragraph 39.002(1)(b), (c) or (d) are complied with in relation to the aircraft or aeronautical product.
Note 1: Paragraph 39.002(1)(b) refers to the requirements of an airworthiness directive, and paragraphs 39.002(1)(c) and (d) refer to the requirements of a means of compliance with the airworthiness directive approved by CASA or an national aviation authority. An airworthiness directive, and a means of compliance with the airworthiness directive approved by CASA or an national aviation authority, will specify when the action required by the airworthiness directive or means of compliance must be carried out.
Note 2: Under regulation 42.110, failure to comply with this regulation is an offence.

42.125  Approval of design for modifications or repairs to aircraft—all aircraft
 (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