What type of certificate verifies compliance of modified or inspected components?

The correct answer is the Approval Tag Form 8130-3. This form is a critical component in the aviation industry as it verifies that modified or inspected components meet the necessary regulatory standards and are in compliance with applicable inspection and modification requirements. When an aircraft part is inspected or modified, the Approval Tag Form 8130-3 is used to document that the part has been tested and found to conform to its approved design.

The significance of this form lies in its ability to provide assurance to both the operator and regulators that the parts used in an aircraft are safe and airworthy. It supports traceability and accountability, which are essential aspects of aircraft maintenance and operation.

In contrast, while a Supplemental Type Certificate (STC) is critical for some modifications to components, it does not serve the role of a compliance verification tool specifically for inspected components. An Airworthiness Certificate indicates that an aircraft is safe to fly, but it does not specifically verify compliance of individual components. A Manufacturer's Service Bulletin provides recommendations or instructions but does not verify the compliance of components in the same formal manner as the Approval Tag Form 8130-3.