I've found a supplemental type certificate that I want to install on my airplane. What do I do now?

You must contact the supplemental type certificate holder to seek written permission. The supplemental type certificate and its related information — all drawings, data, specifications — are the property of the supplemental type certificate holder. FAA will not release this information without authorization from the owner.

I can't find the supplemental type certificate holder. What do I do now?

If the mail you sent was returned "undeliverable" and there is no phone listing for the holder, please contact the issuing FAA office. Supplemental type certificates are approved and issued through the FAA Aircraft Certification Office (ACO) which serves the geographic area of the supplemental type certificate owner’s residence.

Where can I find information about STCs installed on my aircraft?

If you need information about supplemental type certificates that have been installed on your aircraft, you may:

• Search the Supplemental Type Certificates database in the on-line Regulatory and Guidance Library, or
• Go to the Aircraft Registration, Records & Reports section, to request copies of records for your aircraft.