| A supplemental type certificate STC is a type certificate TC issued when an applicant has received FAA approval to modify an aeronautical product from its original design | |
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| An STC Will Not Be Issued• For complex design modifications, the Aircraft Certification Office may ask that you follow the | An STC Will Be Issued• The STC, which incorporates by reference the related TC, approves not only the modification but also how that modification affects the original design |