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Airworthiness Directives (ADs) are issued to address unsafe conditions on aeronautical products, parts and appliances.
Aircraft on the UK register are required to comply with all applicable ADs.
An Alternative Method of Compliance (AMOC) to an AD may be approved by the CAA if requested and appropriately substantiated.
An AMOC to an AD is a different way of meeting the intent of an AD.
Applicants seeking AMOC to an AD approval need to ensure and demonstrate that an equivalent level of safety is achieved compared to the compliance with the original AD.
An AMOC to an AD linked to a minor or major change or an STC will be approved after the related change is approved.
If an AD is superseded, all AMOCs related to the AD are automatically invalidated. In these cases, a new application is required to ascertain that compliance with the new AD is achieved.
A new application is not required when an AD is revised.
Anyone may apply for the CAA approval of an AMOC to an AD.
An application is made using CAA Form
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