StacksVerified U.S. regulatory reference

14 CFR §21.113

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)If a person holds the TC for a product and alters that product by introducing a major change in type design that does not require an application for a new TC under § 21.19, that person must apply to the FAA either for an STC, or to amend the original type certificate under subpart D of this part.
  2. (b)If a person does not hold the TC for a product and alters that product by introducing a major change in type design that does not require an application for a new TC under § 21.19, that person must apply to the FAA for an STC.
  3. (c)The application for an STC must be made in the form and manner prescribed by the FAA.