STCs fall under which part of the Federal Aviation Regulations?

STCs fall under which part of the Federal Aviation Regulations?

• A. Part 21
• B. Part 39
• C. Part 91
• D. Part 43

Answer: (A)

Supplemental Type Certificates are part of the FAA’s certification framework for products and parts. The rules that govern how modifications to an aircraft are approved—and how an STC itself is issued—are found in Part 21. This section covers certification procedures for products and parts, including type certificates, supplemental type certificates, and related approvals. The other parts address different topics: Part 39 deals with Airworthiness Directives, Part 91 covers general operating rules, and Part 43 governs maintenance and alterations. So STCs fit under Part 21.

Supplemental Type Certificates are part of the FAA’s certification framework for products and parts. The rules that govern how modifications to an aircraft are approved—and how an STC itself is issued—are found in Part 21. This section covers certification procedures for products and parts, including type certificates, supplemental type certificates, and related approvals. The other parts address different topics: Part 39 deals with Airworthiness Directives, Part 91 covers general operating rules, and Part 43 governs maintenance and alterations. So STCs fit under Part 21.