Which license is necessary to approve the RTS?

The correct answer is the AMT license, which stands for Airframe and Powerplant Technician license. This license is essential for individuals who perform maintenance, preventive maintenance, and alterations on aircraft. When it comes to approving the Repair and Test Specification (RTS), having this specific license ensures that the technician possesses the expertise and qualifications necessary to evaluate and approve modifications or repairs to aircraft systems safely.

The AMT license establishes a standard of competence in the fundamental areas of aircraft maintenance, thereby giving assurance that the work done conforms to regulatory requirements. Individuals holding this license have demonstrated their ability to oversee and conduct repairs or modifications effectively, which is critical when it comes to ensuring the safety and airworthiness of the aircraft.

Other licenses mentioned, like the AMS license or the PRC-issued Aeronautical Engineer License, may serve different purposes in the aviation field but do not specifically entail the authority required to approve the RTS directly. The Pilot license also does not provide maintenance authorization; it simply certifies someone to operate an aircraft. Thus, the AMT license is the appropriate certification needed in this context.