| 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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| For complex design modifications, the Aircraft Certification Office may ask that you follow the | An STC Will Be Issued• An STC Will Not 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 |
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