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Title 14 Code of Federal Regulations

• Part 21, Certification Procedures for Products and Parts
• Subpart B - Type Certificates
• Subpart D - Changes to Type Certificates
• Subpart E - Supplemental Type Certificates, sections 21.111 through 21.119.
  Section 21.113, Requirement of supplemental type certificate, permits major changes by persons other than the holder of the type certificate.

Advisory Circulars (AC)

• AC 21-40, Application Guide for Obtaining a Supplemental Type Certificate

Orders

• 8110.4, Type Certification
• 8110.48, How to Establish the Certification Basis for Changed Aeronautical Products