Which of the following is a requirement for an inspection authorization holder performing major repairs?

The requirement for an inspection authorization holder performing major repairs to hold a valid mechanic’s certificate is crucial because the certificate ensures that the individual has met the necessary training and certification standards established by the FAA. This ensures that the mechanic possesses adequate knowledge of airframe and powerplant systems, as well as the relevant regulations that govern maintenance practices.

Holding a valid mechanic’s certificate is not just an administrative detail; it signifies that the individual has demonstrated competency in their field and is thereby qualified to make decisions regarding major repairs which can impact the safety and airworthiness of aircraft. This requirement is in place to ensure that only qualified and trained professionals perform significant work on aircraft systems, thereby helping to maintain safety standards in aviation.

The other options, while relevant to the broader context of maintenance practices, do not specifically pertain to the essential criteria required to conduct major repairs under an inspection authorization.