- Publications and resources
- Rules and regulations
- Safety management
- Licences and certification
- About us
Go to top of page
Interim changes to the way specialist maintenance (D rating) approvals are issued
CASA is currently undertaking a post implementation review of the continuing airworthiness rules for approved maintenance organisations (Part 145 and associated legislation).
In a public consultation conducted earlier this year, a range of issues to be addressed by the review were identified – including several specialist maintenance and certification issues. You can read the summary including responses to the consultation and learn about the next steps on our Consultation Hub.
Responses to the consultation have informed the development of an interim measure for how we handle specialist maintenance and the D3 rating approval applications.
While we work with industry to carry out the post implementation review and develop improvements, CASA’s preference is not to issue specialist maintenance ‘D3 other’ ratings. For the issue of a specific D3 rating, which is currently not listed in the Part 145 MOS, it would require an amendment to the Part 145 MOS or the issue of a legislative instrument approving a new category of specialist maintenance. As work is underway to review and improve the legislation, it is not desirable to make changes at the moment. Generally, during the review period, only applicable specialist maintenance categories listed within the Part 145 MOS will be considered for D rating approval.
If you are a non-approved organisation or a Part 145 approved maintenance organisation (AMO) planning to provide a service that you consider may require a D3 rating, please contact your CASA regional office or airworthiness inspector to discuss what is required.
CASA recognises the important role of the various specialised support service providers to approved maintenance organisations. These support services can still be provided under appropriate subcontract arrangements whereby:
- The Part 145 AMO is still responsible that their CASA-approved procedures are followed for each specialist maintenance activity ensuring final determination of aircraft airworthiness or aeronautical product serviceability for issuing the final Certificate Release to Service.
- The AMO has the flexibility to choose subcontractors with or without a D3 rating.
- Subcontractors performing specialist maintenance tasks for an AMO must continue to meet the standards set out by the AMO’s CASA-approved procedures (as they do now).
Information on specialist maintenance is provided in the Part 145 MOS, acceptable means of compliance and guidance material.