A certified change that qualifies as a repair to a type design is known as?

• A. Type Design Change
• B. Supplemental Type Certificate
• C. Repair Design Certificate (RDC)
• D. Aircraft Modification Certificate

Answer: (C)

A certified change that qualifies as a repair to a type design is known as a Repair Design Certificate (RDC). This designation specifically pertains to alterations made to the original design of an aircraft or component that are necessary to address safety issues, enhance performance, or adapt to new regulatory requirements.

The RDC is issued when the proposed repairs have undergone a thorough evaluation and have been found to comply with the applicable airworthiness standards, thus ensuring that the safety and reliability of the aircraft are maintained. It allows operators to implement necessary repairs while keeping regulatory compliance in mind.

In contrast, the types of changes represented by the other options differ significantly in their intent and regulatory requirements. A Type Design Change typically refers to modifications that alter the fundamental characteristics of the aircraft or product, while a Supplemental Type Certificate (STC) allows for changes to a product that are not covered under the original type certificate. An Aircraft Modification Certificate may pertain to authorized changes in equipment or technology but is not specifically defined as a certified change for repairs related to the type design.