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Alternate means of compliance to airworthiness directives
CASR 39.004 allows operators to propose an alternative means of correcting an unsafe condition covered by an airworthiness directive (AD). CASA can approve an alternative as either an alternate means of compliance (AMOC) or an exclusion. An AMOC can be applied to an individual requirement or to the whole AD.
CASA may approve an AMOC or an exclusion if an equivalent level of safety can be demonstrated. CASA will assess the application and make a determination based on engineering practices to ensure that the safety of the aircraft will not be compromised.
Applying for an exclusion
All applications will be charged a fee based on an hourly rate. Upon receiving the application, CASA will estimate the number of hours to assess the application and prepare a written quote for the applicant.
To apply for an exclusion/AMOC, the applicant must:
- complete Form 953 (you can get a hard copy form from you local regional office)
- send the completed form and any supporting documentation to your local regional office
- wait for a quote from CASA
- pay the quoted amount if they wish to proceed.
Once the invoice has been paid, an Airworthiness Specialist will assess the application and make a determination. Please note that payment does not guarantee that the application will be successful.
If the application is successful, the applicant will receive a formal letter of approval allowing the exclusion/AMOC and explaining any conditions associated with it.
The applicant will need to provide engineering justification to demonstrate how the proposed exclusion or means of compliance will address the unsafe condition and to provide an equivalent level of safety to the AD or ensure that the unsafe condition no longer exists.
To support the application it is recommended the engineering justification be endorsed by a CAR 35 engineer, and/or a statement of no technical objection from the manufacturer or the State of Design NAA.
Further information can be found in AC 39-01(4).