14 CFR § 21.55 - Responsibilities of type certificate holders who license the type certificate.

---
identifier: "/us/cfr/t14/s21.55"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 21.55 - Responsibilities of type certificate holders who license the type certificate."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "21.55"
section_name: "Responsibilities of type certificate holders who license the type certificate."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "AIRCRAFT"
part_number: "21"
part_name: "CERTIFICATION PROCEDURES FOR PRODUCTS AND ARTICLES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7572; 49 U.S.C. 106(f), 40105, 40113, 44701-44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303."
cfr_part: "21"
---


# 21.55 Responsibilities of type certificate holders who license the type certificate.

A type certificate holder who allows a person to use the type certificate to manufacture a new aircraft, aircraft engine, or propeller must meet the applicable requirements of part 5 of this chapter and provide that person with a written licensing agreement acceptable to the FAA.

[Docket No. FAA-2021-0419, Amdt. No. 21-108, 89 FR 33108, Apr. 26, 2024]