---
kind: "section"
citation: "14 C.F.R. § 21.113"
title: "14"
number: "21.113"
heading: "Requirement for supplemental type certificate."
url: "https://uscodex.org/cfr/14/21.113"
---

# §21.113. Requirement for supplemental type certificate.

- (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](/cfr/14/21.19.md), that person must apply to the FAA either for an STC, or to amend the original type certificate under [subpart D](/cfr/14/subpartD.md) of this part.
- (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](/cfr/14/21.19.md), that person must apply to the FAA for an STC.
- (c) The application for an STC must be made in the form and manner prescribed by the FAA.

## Notes

### Amendments

[Doc. No. FAA-2006-25877, Amdt. 21-92, 74 FR 53387, Oct. 16, 2009; Doc. No. FAA-2018-0119, Amdt. 21-101, 83 FR 9169, Mar. 5, 2018]

### Source

Source: Docket No. 5085, 29 FR 14568, Oct. 24, 1964, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7572; 49 U.S.C. 106(f), 40105, 40113, 44701-44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303.

### Amendments

[Doc. No. FAA-2006-25877, Amdt. 21-92, 74 FR 53387, Oct. 16, 2009; Doc. No. FAA-2018-0119, Amdt. 21-101, 83 FR 9169, Mar. 5, 2018]