SUPPLEMENTAL TYPE CERTIFICATES.

SEC. 403. SUPPLEMENTAL TYPE CERTIFICATES. Section 44704 is amended— (1) by redesignating subsections (b) and (c) as subsections (c) and (d), respectively; and (2) by inserting after subsection (a) the following: “(b) Supplemental Type Certificates.— “(1) Issuance.— The Administrator may issue a type certificate designated as a supplemental type certificate for a change to an aircraft, aircraft engine, propeller, or appliance. “(2) Contents.— A supplemental type certificate issued under paragraph (1) shall consist of the change to the aircraft, aircraft engine, propeller, or appliance with respect to the previously issued type certificate for the aircraft, aircraft engine, propeller, or appliance. “(3) Requirement.— If the holder of a supplemental type certificate agrees to permit another person to use the certificate to modify an aircraft, aircraft engine, propeller, or appliance, the holder shall provide the other person with written evidence, in a form acceptable to the Administrator, of that agreement. A person may change an aircraft, aircraft engine, propeller, or appliance based on a supplemental type certificate only if the person requesting the change is the holder of the supplmental type certificate or has permission from the holder to make the change.”.