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For information regarding the supplemental type certificate application process, contact the FAA Aircraft Certification Office (ACO) in your geographic area.  The “Application Guide for Obtaining a Supplemental Type Certificate,” and other related advisory, policy and guidance information is available on the STC Regulations & Policies page.

For information regarding the "One-only" supplemental type certificate application process involving non U.S. registered aircraft, where the U.S. is the State of design, see Order 8110.4, paragraph 4-15c.