Code of Federal Regulations · Section
§ 21.120 — Responsibility Of Supplemental Type Certificate Holders To Provide Written Permission For Alterations
14 C.F.R. § 21.120
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A supplemental type certificate holder who allows a person to use the supplemental type certificate to alter an aircraft, aircraft engine, or propeller must provide that person with written permission acceptable to the FAA.
Authorizing Statute
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Enforcement of standards42 U.S.C. § 7572
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Federal Aviation Administration49 U.S.C. § 106